Chris Judd & Jim Shingler

CodeMash 2009 Percompile

&

Christopher JuddPresident/Consultant of

leader

Creator of open source projects FallME and Fiddle

Jim ShinglerChief Technical Architect

President of Genuine Solutions

Co-Creator Open Source Project of FallME

Co-Author of Beginning Groovy and Grails

Goal:Gain enough Groovy and Grails knowledge to be able to build a modest Grails applications.

Install Groovy and GrailsCreate and Run Groovy ScriptsUnderstand basic Groovy Language FeaturesCreate a Scaffolded Web ApplicationApply a Custom Layout and StylingInstall and use PluginsEnable Security

Example Codehttp://github.com/jshingler/codemash2009precompile/tree/master

Software Used• JDK 1.5 >

• Eclipse 3.4

• Groovy plug-in

• Groovy 1.5.7

• Grails 1.0.4

• Plug-ins

• feeds 1.4

• searchable 0.5.1

• jsecurity 0.4-SNAPSHOT

Plus:• Slides• Example Code• Example Resources

Java Platform

What is Java?

What is Java?

What is Java?

Virtual Machine

What is Java?

Virtual Machine

API/Library

What is Java?

Virtual Machine

API/Library

Java Language

What is Java?

Virtual Machine

API/Library

Java LanguageJavaScript

What is Java?

Virtual Machine

API/Library

Java LanguageJavaScript Groovy

What is Java?

Virtual Machine

API/Library

Java LanguageJavaScript Groovy Ruby

What is Java?

Virtual Machine

API/Library

Java LanguageJavaScript Groovy Ruby Python

Language Stack

Java Language

Language Stack

System (static)

Java Language

Language Stack

Groovy

System (static)

Application (Dynamic)

Java Language

Language Stack

Groovy

Domain Specific Languages

System (static)

Application (Dynamic)

Domain

Groovy By Example

import java.util.ArrayList;import java.util.List;

public class Student {

private String firstName; private String lastName; public Student(String firstName, String lastName) { super(); this.firstName = firstName; this.lastName = lastName; }

public String getFirstName() { return firstName; }

public void setFirstName(String firstName) { this.firstName = firstName; }

public String getLastName() { return lastName; }

public void setLastName(String lastName) { this.lastName = lastName; }

public static void main(String[] args) { List<Student> students = new ArrayList<Student>(); students.add(new Student("Chris", "Judd")); students.add(new Student("Jim", "Shingler")); students.add(new Student("Joseph", "Nusairat")); System.out.println("Students:"); for (Student student : students) { System.out.println(student.getLastName() + ", " + student.getFirstName()); } }}

javac -d classes src\main\java\com\juddsolutions\groovy\basics\Student.java

java -cp classes com.juddsolutions.groovy.basics.Student

Student.class

Students:Judd, ChrisShingler, JimNusairat, Joseph

Java Example

import java.util.ArrayList;import java.util.List;

public class Student {

private String firstName; private String lastName; public Student(String firstName, String lastName) { super(); this.firstName = firstName; this.lastName = lastName; }

public String getFirstName() { return firstName; }

public void setFirstName(String firstName) { this.firstName = firstName; }

public String getLastName() { return lastName; }

public void setLastName(String lastName) { this.lastName = lastName; }

public static void main(String[] args) { List<Student> students = new ArrayList<Student>(); students.add(new Student("Chris", "Judd")); students.add(new Student("Jim", "Shingler")); students.add(new Student("Joseph", "Nusairat")); System.out.println("Students:"); for (Students student : students) { System.out.println(student.getLastName() + ", " + student.getFirstName()); } }}

Rename to Students.groovy

groovy src\main\java\com\juddsolutions\groovy\basics\Students.groovy

Students:Judd, ChrisShingler, JimNusairat, Joseph

Congratulationsyou are a

programmer

Christopher M. Judd

President, Consultant, Author685 Farrington Drive

Worthington, Ohio 43085Phone: (614) 378-4119

Email: cjudd@juddsolutions.com

SUMMARY

Chris has 12 years of professional experience in object-oriented, web and mobile technologies as well as technical education and leadership. He has experience with all phases of the software development life-cycle, including requirements, analysis, architecture and design, implementation, testing, performance tuning, support, training and project leadership. In addition, he has provided technical instruction to thousands of information technology professionals though instructor led training, mentoring, conferences, user group meetings and co-authoring “Beginning Groovy and Grails”, “Enterprise Java Development on a Budget” and “Pro Eclipse JST”. He has provided services to a diverse group of industries including manufacturing, transportation, government, insurance, publishing, retail, content management, entertainment, service, and technology consulting.

EXPERIENCE

Java User Group Leader! July 2002 – PresetCentral Ohio Java User Group (COJUG)

! Coordinate and advertise monthly meetings on Java related topics.

Consultant! Sept 2004 – Sept 2008Nationwide Insurance

! Assisted in developing, architecting and performance testing a service oriented architecture (SOA) for selling and servicing insurance agreements using IBM’s Insurance Application Architecture (IAA) as the canonical business model. The services coordinated and orchestrated thirty six integration points including three policy administrative systems. The services were used by three front ends that supported agents and customers on the Internet.

! Assisted in developing and architecting an implementation of IBM’s conceptual Insurance Application Architecture (IAA) framework using Rational Application Developer, WebSphere Application Server, DB2 and Rational Software Modeler for UML modeling

! Profiled and performance tested insurance framework using HP Diagnostics Software. ! Architected, Designed and Developed an IAA based product modeler build on top of the Eclipse

Platform including Eclipse Modeling Framework (EMF) and Graphical Editing Framework (GEF)! Mentored a team of developers with no Java or web development experience to build web applications

using Groovy and Grails.! Mentored a team of developers in Java, J2EE, unit testing, configuration management and agile

methodologies! Set up and administered a continuous integration build server which provides code quality and metrics

reports using ANT, Maven, Cruise Control, CVS, Subversion and other open source tools

Chief Technical O"cer! Jan 2008 – May 2008gwizMOBILE

! Assisted in developing and architecting a mobile auto trading application and advertisement tool using Groovy, Grails and J2ME.

Consultant! June 2003 – Sept 2004CINTAS

! Mentored a team of 4 developers with almost no Java experience to become productive J2EE developers! Archited and developed a multi-tier reusable service based J2EE application using JBuilder, WebLogic,

Struts, Together and SQL Server for a new document management line of business! Taught JBuilder, J2EE, StarTeam, Linux, Dreamweaver, Struts and Object-Oriented Programming

Groovy

Don’t forget to update your

resume.

Copy/Paste Compatibility

idiomatic

Convert POJO to POGOimport java.util.ArrayList;import java.util.List;

public class Student {

private String firstName; private String lastName; public Student(String firstName, String lastName) { super(); this.firstName = firstName; this.lastName = lastName; }

public String getFirstName() { return firstName; }

public void setFirstName(String firstName) { this.firstName = firstName; }

public String getLastName() { return lastName; }

public void setLastName(String lastName) { this.lastName = lastName; }

public static void main(String[] args) { List<Student> students = new ArrayList<Student>(); students.add(new Student("Chris", "Judd")); students.add(new Student("Jim", "Shingler")); students.add(new Student("Joseph", "Nusairat")); System.out.println("Students:"); for (Students student : students) { System.out.println(student.getLastName() + ", " + student.getFirstName()); } }}

Remove visibility modifiers (default is public)

Remove constructor

Remove accessors and mutators

Use named parameter constructor

Use properties

Convert POJO to POGO

package com.juddsolutions.groovy.basics;

import java.util.ArrayList;import java.util.List;

public class Student {

String firstName; String lastName;

public static void main(String[] args) { List<Student> students = new ArrayList<Student>(); students.add(new Student(firstName:"Chris", lastName:"Judd")); students.add(new Student(firstName:"Jim", lastName:"Shingler")); students.add(new Student(firstName:"Joseph", lastName:"Nusairat")); System.out.println("Students:"); for (Students student : students) { System.out.println(student.lastName + ", " + student.firstName); } }}

Remove visibility modifiers (default is public)Remove constructorRemove accessors and mutators

Use named parameter constructor

Use properties

Simplify Code

package com.juddsolutions.groovy.basics;

import java.util.ArrayList;import java.util.List;

public class Student {

String firstName; String lastName;

public static void main(String[] args) { List<Student> students = new ArrayList<Student>(); students.add(new Student(firstName:"Chris", lastName:"Judd")); students.add(new Student(firstName:"Jim", lastName:"Shingler")); students.add(new Student(firstName:"Joseph", lastName:"Nusairat")); System.out.println("Students:"); for (Students student : students) { System.out.println(student.lastName + ", " + student.firstName); } }}

java.util.*, java.net.*, java.io.* as well as groovy.lang.* and groovy.util.* are implicitly

imported

Typing variables is optional

Semicolons and parenthesis are optional

Convenience methodsFlexible Strings

Simplify Code

package com.juddsolutions.groovy.basics;

public class Student {

String firstName String lastName

public static void main(String[] args) { def students = new ArrayList() students.add new Student(firstName:"Chris", lastName:"Judd") students.add new Student(firstName:"Jim", lastName:"Shingler") students.add new Student(firstName:"Joseph", lastName:"Nusairat") println "Students:" for (Student student : students) { println "${student.lastName}, ${student.firstName}" } }}

java.util.*, java.net.*, java.io.* as well as groovy.lang.* and groovy.util.* are implicitly

imported

Typing variables is optional

Semicolons and parenthesis are optional

Convenience methodsFlexible Strings

Collections and Closures

package com.juddsolutions.groovy.basics;

public class Student {

String firstName String lastName

public static void main(String[] args) { def students = new ArrayList() students.add new Student(firstName:"Chris", lastName:"Judd") students.add new Student(firstName:"Jim", lastName:"Shingler") students.add new Student(firstName:"Joseph", lastName:"Nusairat") println "Students:" for (Student student : students) { println "${student.lastName}, ${student.firstName}" } }}

Use Groovy collection notation

Use Groovy closures for looping

Collections and Closures

package com.juddsolutions.groovy.basics;

public class Student {

String firstName String lastName

public static void main(String[] args) { def students = [ new Student(firstName:"Chris", lastName:"Judd"), new Student(firstName:"Jim", lastName:"Shingler"), new Student(firstName:"Joseph", lastName:"Nusairat"), ] println "Students:" students.each {student -> println "${student.lastName}, ${student.firstName}" } }}

Use Groovy collection notation

Use Groovy closures for looping

Scripts

package com.juddsolutions.groovy.basics;

public class Student {

String firstName String lastName

public static void main(String[] args) { def students = [ new Student(firstName:"Chris", lastName:"Judd"), new Student(firstName:"Jim", lastName:"Shingler"), new Student(firstName:"Joseph", lastName:"Nusairat"), ] println "Students:" students.each {student -> println "${student.lastName}, ${student.firstName}" } }}

Java’s main method is not necessary since Groovy is scriptable

Scripts

package com.juddsolutions.groovy.basics;

public class Student {

String firstName String lastName

}

def students = [ new Student(firstName:"Chris", lastName:"Judd"), new Student(firstName:"Jim", lastName:"Shingler"), new Student(firstName:"Joseph", lastName:"Nusairat"),] println "Students:"students.each {student -> println "${student.lastName}, ${student.firstName}"}

Java’s main method is not necessary since Groovy is scriptable

VS

package com.juddsolutions.groovy.basics;

public class Student {

String firstName String lastName

}

def students = [ new Student(firstName:"Chris", lastName:"Judd"), new Student(firstName:"Jim", lastName:"Shingler"), new Student(firstName:"Joseph", lastName:"Nusairat"),] println "Students:"students.each {student -> println "${student.lastName}, ${student.firstName}"}

import java.util.ArrayList;import java.util.List;

public class Student {

private String firstName; private String lastName; public Student(String firstName, String lastName) { super(); this.firstName = firstName; this.lastName = lastName; }

public String getFirstName() { return firstName; }

public void setFirstName(String firstName) { this.firstName = firstName; }

public String getLastName() { return lastName; }

public void setLastName(String lastName) { this.lastName = lastName; }

public static void main(String[] args) { List<Student> students = new ArrayList<Student>(); students.add(new Student("Chris", "Judd")); students.add(new Student("Jim", "Shingler")); students.add(new Student("Joseph", "Nusairat")); System.out.println("Students:"); for (Student student : students) { System.out.println(student.getLastName() + ", " + student.getFirstName()); } }}

VS

package com.juddsolutions.groovy.basics;

public class Student {

String firstName String lastName

}

def students = [ new Student(firstName:"Chris", lastName:"Judd"), new Student(firstName:"Jim", lastName:"Shingler"), new Student(firstName:"Joseph", lastName:"Nusairat"),] println "Students:"students.each {student -> println "${student.lastName}, ${student.firstName}"}

import java.util.ArrayList;import java.util.List;

public class Student {

private String firstName; private String lastName; public Student(String firstName, String lastName) { super(); this.firstName = firstName; this.lastName = lastName; }

public String getFirstName() { return firstName; }

public void setFirstName(String firstName) { this.firstName = firstName; }

public String getLastName() { return lastName; }

public void setLastName(String lastName) { this.lastName = lastName; }

public static void main(String[] args) { List<Student> students = new ArrayList<Student>(); students.add(new Student("Chris", "Judd")); students.add(new Student("Jim", "Shingler")); students.add(new Student("Joseph", "Nusairat")); System.out.println("Students:"); for (Student student : students) { System.out.println(student.getLastName() + ", " + student.getFirstName()); } }}

Groovy Basics

What is Groovy?Groovy is an expressive, dynamic, object oriented language

built for the Java Virtual Machine (JVM) with lots of agile and modern language features.

What is Groovy?Groovy is an expressive, dynamic, object oriented language

built for the Java Virtual Machine (JVM) with lots of agile and modern language features.

Better Java

What is Groovy?Groovy is an expressive, dynamic, object oriented language

built for the Java Virtual Machine (JVM) with lots of agile and modern language features.

Java 3.0Better Java

What is Groovy?Groovy is an expressive, dynamic, object oriented language

built for the Java Virtual Machine (JVM) with lots of agile and modern language features.

Java 3.0Better Java• Properties• Closures• Optional Typing• Cool Operators• Operator Overloading

What is Groovy?Groovy is an expressive, dynamic, object oriented language

built for the Java Virtual Machine (JVM) with lots of agile and modern language features.

Java 3.0Better Java• Properties• Closures• Optional Typing• Cool Operators• Operator Overloading

• Builders • Meta-Programming• Groovy JDK• Domain Specific Languages• Unit Testing

def groovy = []groovy << javagroovy << rubygroovy << pythongroovy << smalltalkgroovy << dynamicgroovy << scriptinggroovy << agile

Groovy is Java

Groovy is Javapackage com.juddsolutions.groovy.basics;

public class Student {

String firstName String lastName

}

def students = [ new Student(firstName:"Chris", lastName:"Judd"), new Student(firstName:"Jim", lastName:"Shingler"), new Student(firstName:"Joseph", lastName:"Nusairat"),] println "Students:"students.each {student -> println "${student.lastName}, ${student.firstName}"}

Groovy is Javapackage com.juddsolutions.groovy.basics;

public class Student {

String firstName String lastName

}

def students = [ new Student(firstName:"Chris", lastName:"Judd"), new Student(firstName:"Jim", lastName:"Shingler"), new Student(firstName:"Joseph", lastName:"Nusairat"),] println "Students:"students.each {student -> println "${student.lastName}, ${student.firstName}"}

javap Studentgroovyc Student

Groovy is Javapackage com.juddsolutions.groovy.basics;

public class Student {

String firstName String lastName

}

def students = [ new Student(firstName:"Chris", lastName:"Judd"), new Student(firstName:"Jim", lastName:"Shingler"), new Student(firstName:"Joseph", lastName:"Nusairat"),] println "Students:"students.each {student -> println "${student.lastName}, ${student.firstName}"}

javap Studentgroovyc Studentpublic class com.juddsolutions.groovy.basics.Student

extends java.lang.Object implements groovy.lang.GroovyObject {

public static final java.lang.Class $ownClass; public static java.lang.ref.SoftReference $staticMetaClass; transient groovy.lang.MetaClass metaClass; public static java.lang.Long __timeStamp; public static java.lang.Long __timeStamp__239_neverHappen1228887197896; public com.juddsolutions.groovy.basics.Student(); protected groovy.lang.MetaClass $getStaticMetaClass(); public groovy.lang.MetaClass getMetaClass(); public java.lang.Object invokeMethod(java.lang.String, java.lang.Object); public java.lang.Object getProperty(java.lang.String); public void setProperty(java.lang.String, java.lang.Object); static {};

public java.lang.String getFirstName(); public void setFirstName(java.lang.String); public java.lang.String getLastName(); public void setLastName(java.lang.String); public void setMetaClass(groovy.lang.MetaClass); void super$1$wait(); java.lang.String super$1$toString(); void super$1$wait(long); void super$1$wait(long, int); void super$1$notify(); void super$1$notifyAll(); java.lang.Class super$1$getClass(); boolean super$1$equals(java.lang.Object); java.lang.Object super$1$clone(); int super$1$hashCode(); void super$1$finalize(); static java.lang.Class class$(java.lang.String);}

Groovy is Javapackage com.juddsolutions.groovy.basics;

public class Student {

String firstName String lastName

}

def students = [ new Student(firstName:"Chris", lastName:"Judd"), new Student(firstName:"Jim", lastName:"Shingler"), new Student(firstName:"Joseph", lastName:"Nusairat"),] println "Students:"students.each {student -> println "${student.lastName}, ${student.firstName}"}

javap Student

But Java is not Groovy

groovyc Studentpublic class com.juddsolutions.groovy.basics.Student

extends java.lang.Object implements groovy.lang.GroovyObject {

public static final java.lang.Class $ownClass; public static java.lang.ref.SoftReference $staticMetaClass; transient groovy.lang.MetaClass metaClass; public static java.lang.Long __timeStamp; public static java.lang.Long __timeStamp__239_neverHappen1228887197896; public com.juddsolutions.groovy.basics.Student(); protected groovy.lang.MetaClass $getStaticMetaClass(); public groovy.lang.MetaClass getMetaClass(); public java.lang.Object invokeMethod(java.lang.String, java.lang.Object); public java.lang.Object getProperty(java.lang.String); public void setProperty(java.lang.String, java.lang.Object); static {};

public java.lang.String getFirstName(); public void setFirstName(java.lang.String); public java.lang.String getLastName(); public void setLastName(java.lang.String); public void setMetaClass(groovy.lang.MetaClass); void super$1$wait(); java.lang.String super$1$toString(); void super$1$wait(long); void super$1$wait(long, int); void super$1$notify(); void super$1$notifyAll(); java.lang.Class super$1$getClass(); boolean super$1$equals(java.lang.Object); java.lang.Object super$1$clone(); int super$1$hashCode(); void super$1$finalize(); static java.lang.Class class$(java.lang.String);}

Dynamic

Static

StrongWeakC++

JavaScript

Scala

Dynamic

Static

StrongWeakC++

JavaScript

Scala

Groovy is:• Strongly typed• Dynamically typed• Optionally typed• Duck typed

Also known as the Groovy JDKextends the classes built into the JDK class

library

GDK

Even final classes like String

def p = "cmd /c dir".execute()println p.text

java.lang.String

Also known as the Groovy JDKextends the classes built into the JDK class

library

GDK

Even final classes like String

def p = "cmd /c dir".execute()println p.text

java.lang.String Volume in drive C has no label. Volume Serial Number is 38EC-A476

Directory of C:\devl\workspaces\groovy-class\groovy-language-basics

12/15/2008 02:40 PM <DIR> .12/15/2008 02:40 PM <DIR> ..12/09/2008 03:12 AM 373 .classpath12/02/2008 04:42 AM 588 .project12/02/2008 04:42 AM <DIR> .settings12/15/2008 02:42 PM <DIR> bin-groovy12/09/2008 03:12 AM <DIR> build12/02/2008 06:58 PM <DIR> src 2 File(s) 961 bytes 6 Dir(s) 30,512,635,904 bytes free

Installing Groovy

1. Download from http://groovy.codehaus.org/Download• 1.5.7 - Stable Release• 1.6 beta 2 - Development Release

2. Unzip archive3. Set GROOVY_HOME environment variable4. Add %GROOVY_HOME%\bin to system path

Depends on JDK 1.4 or greater

Installing Groovy

1. Download from http://groovy.codehaus.org/Download• 1.5.7 - Stable Release• 1.6 beta 2 - Development Release

2. Unzip archive3. Set GROOVY_HOME environment variable4. Add %GROOVY_HOME%\bin to system path

Don’t use the installer!!!

Depends on JDK 1.4 or greater

Running Groovy

scripts

shell

console groovyConsole

groovysh

groovy

just include groovy-all-<version>.jar in classpath

Deploying

Note: Quality of Groovy support is represented by size

Ant.property(environment:"env") grailsHome = Ant.antProject.properties."env.GRAILS_HOME"

includeTargets << new File ( "${grailsHome}/scripts/War.groovy" )

target ('default':'''Copies a WAR archive to a Java EE application server's deploy directory.

Example: grails deploygrails prod deploy''') { deploy()}

target (deploy: "The implementation target") { depends( war ) def deployDir = Ant.antProject.properties.'deploy.dir'

Ant.copy(todir:"${deployDir}", overwrite:true) { fileset(dir:"${basedir}", includes:"*.war") }

event("StatusFinal", ["Done copying WAR to ${deployDir}"])}

<groovy>println "Hello World"

</groovy>

<build> <plugins> <plugin> <groupId>org.codehaus.groovy.maven</groupId> <artifactId>gmaven-plugin</artifactId> <executions> <execution> <goals> <goal>compile</goal> <goal>testCompile</goal> </goals> </execution> </executions> </plugin> </plugins></build>

Groovy Site - http://groovy.codehaus.org/Documentation - http://groovy.codehaus.org/Documentation

GDK - http://groovy.codehaus.org/groovy-jdk/

Groovy Zone - http://groovy.dzone.com/Groovy Blogs - http://groovyblogs.org/entries/recent

Web Application FrameworkPersistable Domains ObjectsControllersViews (Groovy Server Pages)

Development EnvironmentSpringHibernate (GORM)SiteMeshJettyHSQLDBPrototype & ScriptaculousJUnitGant

Griffon

Swing Application Framework

Griffon

Swing Application Framework

How do you introduceGroovy to the Enterprise?

Unit TestingAutomationBuildsPrototyping

Lab 11.Create a HelloWorld Groovy script passing your name

as a parameter.2.Execute the HelloWorld script. 3. javap the HelloWorld code from Lab 1 to determine the

super class.4.Use either the Groovy Console or Groovy Shell to

print out 10 asterisks.

Lab 11.Create a HelloWorld Groovy script passing your name

as a parameter.2.Execute the HelloWorld script. 3. javap the HelloWorld code from Lab 1 to determine the

super class.4.Use either the Groovy Console or Groovy Shell to

print out 10 asterisks.

Hello Chris!!!

Language Basics

StringsQuotedef quote = "Double Quote"println "${quote} is a ${quote.class.name}"

Single

def single = 'Single Quote'println "${single} is a ${single.class.name}"

def slashy = /Slashy Quote/println "${slashy} is a ${slashy.class.name}"

Slashy

Multilinedef multiline = """select * from tablewhere name=value"""

println "${multiline} is a ${multiline.class.name}"

StringsQuotedef quote = "Double Quote"println "${quote} is a ${quote.class.name}"

Single

def single = 'Single Quote'println "${single} is a ${single.class.name}"

def slashy = /Slashy Quote/println "${slashy} is a ${slashy.class.name}"

Slashy

Multilinedef multiline = """select * from tablewhere name=value"""

println "${multiline} is a ${multiline.class.name}"

Don’t have to escape \

GString

def datetime = "Datetime: ${new Date()}"println "${datetime}"

org.codehaus.groovy.runtime.GStringImpl

String interpolation

Asserts

assert a != nullassert a != null, 'a must not be null'

An assertion is used to validate an expected condition is true, according to Groovy Truth.

If the expected condition is not true, a java.lang.AssertionError is thrown.

Groovy Truth

true• Non-empty maps• Non-empty Strings• Non-zero numbers• Non-null object references• Matching regex patterns

false• Empty collections• Iterators or Enumerators

with no further elements

Groovy Methods

Implicitly returns last expressionAccess modifier is public by default

def passwordtize(text) { def password = '' text.each {password += '*'} password}

Closures

A block of reusable code.

A closure is an object.

def sayHello = { println "hello!" }sayHello() //prints "hello!"

def sayHelloTo = {name -> println "Hello ${name}!" }sayHelloTo('Chris') //prints "Hello Chris"sayHelloTo 'Chris' //prints "Hello Chris"

passing parameters

def sayHelloTo = {println "Hello ${it}!" }sayHelloTo 'Jim' //prints "Hello Jim"

implicit it

Lists

def authors = []authors.add 'Chris'authors += 'Jim'authors << 'Joseph'

println "Authors:"authors.each{ println it }

println "type: ${authors.class.name}" // java.util.ArrayListprintln "first author is ${authors[0]}"println "last author is ${authors.last()}"

Array like syntax

Connivence methods and operators

def books = [] as Setbooks << "Enterprise Java Development on a Budget"books << "Pro Eclipse JST"books << "Beginning Groovy and Grails"

println"\nBooks:"books.each {book -> println book}println "type: ${books.class.name}" // java.util.HashSet

Alternative types

RangesA list of sequential values.

def numbers = 1..10assert numbers.size() == 10numbers.each{ print it }assert numbers.contains(5)

println()

('a'..'z').each{ print it }

println()

for(i in 'a'..'z') { print i}

RangesA list of sequential values.

def numbers = 1..10assert numbers.size() == 10numbers.each{ print it }assert numbers.contains(5)

println()

('a'..'z').each{ print it }

println()

for(i in 'a'..'z') { print i} 12345678910

abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz

MapsAn unordered collection of key/value pair where the key is unique.def map = ['a':'A', 'b':'B', 'c':'C' ]

println mapprintln map.getClass().name // java.util.LinkedHashMap

println map['a']println map.'a'println map.aprintln map.get('a')println map.getAt('a')

println map.get('d', 'D')map.e = 'E'map['f'] = 'F'map.'g' = 'G'map.put('h', 'H')

println map

MapsAn unordered collection of key/value pair where the key is unique.def map = ['a':'A', 'b':'B', 'c':'C' ]

println mapprintln map.getClass().name // java.util.LinkedHashMap

println map['a']println map.'a'println map.aprintln map.get('a')println map.getAt('a')

println map.get('d', 'D')map.e = 'E'map['f'] = 'F'map.'g' = 'G'map.put('h', 'H')

println map

["a":"A", "b":"B", "c":"C"]java.util.LinkedHashMapAAAAAD["a":"A", "b":"B", "c":"C", "d":"D", "e":"E", "f":"F", "g":"G", "h":"H"]

Maps

//Print each key/value pair on aseparate line map.each { println "Key: ${it.key}, Value: ${it.value}" }

// Print each key/value pair on aseparate line with index map.eachWithIndex { it, i -> println "${i} Key: ${it.key}, Value: ${it.value}" }

//Print the key setprintln "\nKeys:"map.keySet().each { println it }

// Print the value setprintln "\nValues:"map.values().each { println it }

def numbers = [1:'one', 2: 'two', 3:'three']

def all = map + numbersprintln all

Regular Expressions

Operators• match (==~)• find (=~)• pattern (~string)

// Matching Operators

assert "abc" ==~ 'abc' assert "abc" ==~ /abc/ assert !("abcabc" ==~ /abc/) // Fails – not an exact match assert "abc" ==~ /^a.c/ // Starts with a, 1 char, ends with c assert "abc" ==~ /^a../ // Starts with a, 2 chars assert "abc" ==~ /.*c$/ // One or more chars end with c assert "abc" ==~ ".*c\$" // Slashy string is better

// Find Operatordef matcher = 'Groovy is groovy' =~ /(G|g)roovy/ print "Size of matcher is ${matcher.size()} " println "with elements ${matcher[0]} and ${matcher[1]}."

// Pattern Operatordef quote = """Now is the time for all good men (and women) to come to the aid of their country"""

def pattern = ~/(\w+en)/ matcher = pattern.matcher(quote) println "Matches = ${matcher.getCount()}"for(i in matcher.iterator()) { println i}

Regular Expressions

Operators• match (==~)• find (=~)• pattern (~string)

// Matching Operators

assert "abc" ==~ 'abc' assert "abc" ==~ /abc/ assert !("abcabc" ==~ /abc/) // Fails – not an exact match assert "abc" ==~ /^a.c/ // Starts with a, 1 char, ends with c assert "abc" ==~ /^a../ // Starts with a, 2 chars assert "abc" ==~ /.*c$/ // One or more chars end with c assert "abc" ==~ ".*c\$" // Slashy string is better

// Find Operatordef matcher = 'Groovy is groovy' =~ /(G|g)roovy/ print "Size of matcher is ${matcher.size()} " println "with elements ${matcher[0]} and ${matcher[1]}."

// Pattern Operatordef quote = """Now is the time for all good men (and women) to come to the aid of their country"""

def pattern = ~/(\w+en)/ matcher = pattern.matcher(quote) println "Matches = ${matcher.getCount()}"for(i in matcher.iterator()) { println i}

Size of matcher is 2 with elements ["Groovy", "G"] and ["groovy", "g"].

Matches = 2menwomen

Operator OverloadingOperator Method

a + b a.plus(b)a - b a.minus(b)a * b a.multiply(b)a ** b a.power(b)a / b a.div(b)a % b a.mod(b)a | b a.or(b)a & b a.and(b)a ^ b a.xor(b)

a++ or ++a a.next()a-- or --a a.previous()

a[b] a.getAt(b)a[b] = c a.putAt(b,c)

a << b a.leftShift(b)a >> b a.rightShift(b)

switch(a) { case(b) : } b.isCase(a)~a a.bitwiseNegate()-a a.negative()+a a.positive()

class Person {String firstNameString lastNamePerson spouse

String toString() { "${lastName}, ${firstName}" }

Person leftShift(partner) {

partner.lastName = lastNamespouse = partnerpartner.spouse = this

}}

def husband = new Person(firstName:"Chris", lastName:"Judd")def wife = new Person(firstName: "Sue", lastName:"Smith")

// husband and wife get marriedhusband << wife

println wife

a << b a.leftShift(b)a >> b a.rightShift(b)

switch(a) { case(b) : } b.isCase(a)~a a.bitwiseNegate()-a a.negative()+a a.positive()

class Person {String firstNameString lastNamePerson spouse

String toString() { "${lastName}, ${firstName}" }

Person leftShift(partner) {

partner.lastName = lastNamespouse = partnerpartner.spouse = this

}}

def husband = new Person(firstName:"Chris", lastName:"Judd")def wife = new Person(firstName: "Sue", lastName:"Smith")

// husband and wife get marriedhusband << wife

println wife

Judd, Sue

Operators// Spread Operator

def strings = ['chris', 'jim', 'joseph']

println strings*.getAt(0)

// Elvis Operator

def value = nullprintln value == null ? "unknown" : value // Java ternaryprintln value ?: "unknown" // Elvis Operator value = "cool"println value ?: "unknown" // Elvis Operator // Safe Navigation/Dereference Operator

def string = nullprintln "String lenth is ${string?.size()}"

Operators// Spread Operator

def strings = ['chris', 'jim', 'joseph']

println strings*.getAt(0)

// Elvis Operator

def value = nullprintln value == null ? "unknown" : value // Java ternaryprintln value ?: "unknown" // Elvis Operator value = "cool"println value ?: "unknown" // Elvis Operator // Safe Navigation/Dereference Operator

def string = nullprintln "String lenth is ${string?.size()}"

["c", "j", "j"]unknownunknowncoolString length is null

Exception in thread "main" groovy.lang.MissingPropertyException: No such property: b for class: Asserts at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:50) at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.getGroovyObjectProperty(ScriptBytecodeAdapter.java:537) at Asserts.run(Asserts.groovy:5) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:86) at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:230) at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:912) at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:756) at org.codehaus.groovy.runtime.InvokerHelper.invokePogoMethod(InvokerHelper.java:778) at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:758) at org.codehaus.groovy.runtime.InvokerHelper.runScript(InvokerHelper.java:401) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:86) at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:230) at groovy.lang.MetaClassImpl.invokeStaticMethod(MetaClassImpl.java:1105) at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:749) at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodN(ScriptBytecodeAdapter.java:170) at Asserts.main(Asserts.groovy)

Interpreting Call Stacks

Find first occurrence of *.groovy

Lab 2

1.Create a list from 1-10. Then find all the odd numbers and print them out.

2.Print out the list of numbers separated by spaces.

Groovy Libraries

Basic unit testing

Groovy Unit TestsExtend GroovyTestCase which extends JUnit TestCase

class RangeTest extends GroovyTestCase { def lowerCaseRange = 'a'..'z' def upperCaseRange = 'A'..'Z' void testLowerCaseRange() {

assert 26 == lowerCaseRange.size() assertTrue(lowerCaseRange.contains('b')) assertFalse(lowerCaseRange.contains('B')) } void testUpperCaseRange() { assert 26 == upperCaseRange.size() assertTrue(upperCaseRange.contains('B')) assertFalse(upperCaseRange.contains('b')) } void testAlphaRange() { def alphaRange = lowerCaseRange + upperCaseRange assert 52 == alphaRange.size() assert alphaRange.contains('b') assert alphaRange.contains('B') } }

Groovy Unit TestsExtend GroovyTestCase which extends JUnit TestCase

class RangeTest extends GroovyTestCase { def lowerCaseRange = 'a'..'z' def upperCaseRange = 'A'..'Z' void testLowerCaseRange() {

assert 26 == lowerCaseRange.size() assertTrue(lowerCaseRange.contains('b')) assertFalse(lowerCaseRange.contains('B')) } void testUpperCaseRange() { assert 26 == upperCaseRange.size() assertTrue(upperCaseRange.contains('B')) assertFalse(upperCaseRange.contains('b')) } void testAlphaRange() { def alphaRange = lowerCaseRange + upperCaseRange assert 52 == alphaRange.size() assert alphaRange.contains('b') assert alphaRange.contains('B') } }

GroovyTestCase adds:• assertArrayEquals• assertContains• assertEquals• assertInspect• assertLength• assertScript• assertToString

Running Unit Tests

Runs in standard JUnit tools like Eclipse and Ant

Running Unit Tests

Groovy command-line is unit test aware

Database

import groovy.sql.Sql

// Create connectiondef sql = Sql.newInstance( /jdbc:derby:C:\Program Files\Sun\JavaDB\demo\databases\toursdb/, "APP", "APP", "org.apache.derby.jdbc.EmbeddedDriver")

// Execute SQL and iterate over result setsql.eachRow( "select * from CITIES where Language='English' order by COUNTRY") { println "${it.city_name}, ${it.country}"}

groovy.sql.SQL

Database convenience API

import groovy.sql.Sql

// Create connectiondef sql = Sql.newInstance(/jdbc:derby:C:\temp\blogs;create=true/, "APP", "APP", "org.apache.derby.jdbc.EmbeddedDriver")

// delete table if previously createdtry { sql.execute("drop table blogs")} catch(Exception e){}

// create tablesql.execute('''create table blogs ( id varchar(200) not null primary key, title varchar(500))''')

// populate the tabledef blogs = sql.dataSet("blogs")blogs.add( id:"1", title: 'title 1' )blogs.add( id:"2", title: 'title 2' )blogs.add( id:"3", title: 'title 3' )

sql.executeInsert("insert into blogs values('4', 'title 4')")

println "Blogs:"

//Execute SQL and iterate over result set.sql.eachRow("select * from blogs") { println "${it.id}, ${it.title}"}

I/O

// write filenew File(/C:\temp\states.txt/).text = "Ohio"

// append filedef file = new File(/C:\temp\states.txt/)file.append("\nTexas")

Write File

Read File

// read filenew File(/C:\temp\states.txt/).eachLine {line -> println line}

// read file into Stringdef contents = new File(/C:\temp\states.txt/).textprintln contents

// read file into Listdef lines = new File(/C:\temp\states.txt/).readLines()lines.each { println it }

Read URL

def feed = new URL( "http://juddsolutions.blogspot.com/feeds/posts/default").text

Builders

Groovy Builders

A combination of Groovy language features such as meta-programming, closures and simplified map syntax for

creating nested tree-like structures

Name DescriptionAntBuilder Enables the script and execution of Apache Ant tasks

DOMBuilder Generates W3C DOMs

MarkupBuilder GeneratesXML and HTML

NodeBuilder Creates nested trees of objects for handling arbitrary data

SwingBuilder Creates Java Swing UIs

def writer = new StringWriter() def builder = new groovy.xml.MarkupBuilder(writer) builder.setDoubleQuotes(true) builder.authors { author(id:"1") { firstName "Chris" lastName "Judd" } author(id:"2") { firstName "Jim" lastName "Shingler" } author(id:"3") { firstName "Joseph" lastName "Nusirat" } } println writer.toString()

MarkupBuilders

def writer = new StringWriter() def builder = new groovy.xml.MarkupBuilder(writer) builder.setDoubleQuotes(true) builder.authors { author(id:"1") { firstName "Chris" lastName "Judd" } author(id:"2") { firstName "Jim" lastName "Shingler" } author(id:"3") { firstName "Joseph" lastName "Nusirat" } } println writer.toString()

MarkupBuilders

<authors> <author id="1"> <firstName>Chris</firstName> <lastName>Judd</lastName> </author> <author id="2"> <firstName>Jim</firstName> <lastName>Shingler</lastName> </author> <author id="3"> <firstName>Joseph</firstName> <lastName>Nusirat</lastName> </author></authors>

XML Parsing

XML Slurping

def xml = """<authors> <author id="1"> <firstName>Chris</firstName> <lastName>Judd</lastName> </author> <author id="2"> <firstName>Jim</firstName> <lastName>Shingler</lastName> </author> <author id="3"> <firstName>Joseph</firstName> <lastName>Nusirat</lastName> </author></authors>"""

def authors = new XmlSlurper().parseText(xml)authors.author.each {author -> println "${author.@id} - ${author.lastName}, ${author.firstName}"}

XML Slurping

def xml = """<authors> <author id="1"> <firstName>Chris</firstName> <lastName>Judd</lastName> </author> <author id="2"> <firstName>Jim</firstName> <lastName>Shingler</lastName> </author> <author id="3"> <firstName>Joseph</firstName> <lastName>Nusirat</lastName> </author></authors>"""

def authors = new XmlSlurper().parseText(xml)authors.author.each {author -> println "${author.@id} - ${author.lastName}, ${author.firstName}"}

1 - Judd, Chris2 - Shingler, Jim3 - Nusirat, Joseph

Lab 31.Write a script that downloads and RSS feed and writes

the id and title to JavaDB.2.Write a script to read the JavaDB and create an XML

document.

Hint: When behind a you will have to set proxy properties:• http.proxyHost=myServer.net • http.proxyPort=80 • http.proxyUser=<user id>• proxyPassword=<user password>

Modern Java Web Development

Java Web ProjectsWhat do you need to start a Java?

Java Web Projects

• JDK

What do you need to start a Java?

Java Web Projects

• JDK• Web Container/App Server

What do you need to start a Java?

Java Web Projects

• JDK• Web Container/App Server

What do you need to start a Java?

Java Web Projects

• JDK• Web Container/App Server• Build System

What do you need to start a Java?

Java Web Projects

• JDK• Web Container/App Server• Build System

What do you need to start a Java?

Java Web Projects

• JDK• Web Container/App Server• Build System• Application Stack

What do you need to start a Java?

Java Web Projects

• JDK• Web Container/App Server• Build System• Application Stack

What do you need to start a Java?

Java Web Projects

• JDK• Web Container/App Server• Build System• Application Stack• Persistence Framework

What do you need to start a Java?

Java Web Projects

• JDK• Web Container/App Server• Build System• Application Stack• Persistence Framework

What do you need to start a Java?

Java Web Projects

• JDK• Web Container/App Server• Build System• Application Stack• Persistence Framework• Web Framework

What do you need to start a Java?

Java Web Projects

• JDK• Web Container/App Server• Build System• Application Stack• Persistence Framework• Web Framework

What do you need to start a Java?

Java Web Projects

• JDK• Web Container/App Server• Build System• Application Stack• Persistence Framework• Web Framework• Unit Test Framework

What do you need to start a Java?

Java Web Projects

• JDK• Web Container/App Server• Build System• Application Stack• Persistence Framework• Web Framework• Unit Test Framework

What do you need to start a Java?

Java Web Projects

• JDK• Web Container/App Server• Build System• Application Stack• Persistence Framework• Web Framework• Unit Test Framework• AJAX Framework

What do you need to start a Java?

Java Web Projects

• JDK• Web Container/App Server• Build System• Application Stack• Persistence Framework• Web Framework• Unit Test Framework• AJAX Framework

What do you need to start a Java?

Java Web Projects

• JDK• Web Container/App Server• Build System• Application Stack• Persistence Framework• Web Framework• Unit Test Framework• AJAX Framework• Database

What do you need to start a Java?

Java Web Projects

• JDK• Web Container/App Server• Build System• Application Stack• Persistence Framework• Web Framework• Unit Test Framework• AJAX Framework• Database

What do you need to start a Java?

Java Web Projects

• JDK• Web Container/App Server• Build System• Application Stack• Persistence Framework• Web Framework• Unit Test Framework• AJAX Framework• Database• Scheduling Framework .

What do you need to start a Java?

Java Web Projects

• JDK• Web Container/App Server• Build System• Application Stack• Persistence Framework• Web Framework• Unit Test Framework• AJAX Framework• Database• Scheduling Framework .• XML Framework

What do you need to start a Java?

Java Web Projects

• JDK• Web Container/App Server• Build System• Application Stack• Persistence Framework• Web Framework• Unit Test Framework• AJAX Framework• Database• Scheduling Framework .• XML Framework• Logging Framework

What do you need to start a Java?

Java Web Projects

• JDK• Web Container/App Server• Build System• Application Stack• Persistence Framework• Web Framework• Unit Test Framework• AJAX Framework• Database• Scheduling Framework .• XML Framework• Logging Framework• View

What do you need to start a Java?

Java Web Projects

• JDK• Web Container/App Server• Build System• Application Stack• Persistence Framework• Web Framework• Unit Test Framework• AJAX Framework• Database• Scheduling Framework .• XML Framework• Logging Framework• View• IDE .

What do you need to start a Java?

Java Development Cycle

Code

Java Development Cycle

Takes too much time and is too complicated

Compile

Package

Deploy

Debug

Test

Conclusion

Java Web and J2EE development is too complicated and not very agile.

A Solution

A Solution

&

What is Grails

Grails is• Web Application Framework• Development Environment• Open Source under Apache 2.0 License• Current version 1.0.4 (1.1 is around the corner)• Best Practices

– Convention over configuration– Don’t repeat yourself (DRY)– Default is what you expect (DIWYE)– Agile– Scaffolding– AJAX– Plug-ins– Unit testing– Web Services

Grails Framework• JDK• Web Container/App Server• Build System• Application Stack• Persistence Framework• Web Framework• Unit Test Framework• AJAX Framework• Database• Scheduling Framework• XML Framework• Logging Framework• View• IDE

JDK 1.4

GORM

Grails Architecture

Java Virtual Machine

Java Language Groovy Language

Grails

Application

Libraries

Gan

t

Spring GORMSiteMesh

DomainControllers Views Services

MVC Application Design

Controller

GSP

Dom

ain DB

Service Applications

Controller

GSP

Dom

ain•Service DB

Dom

ain

•Service

Default Development Environment

JVMJetty (Web Container)

Controller

GSP

Dom

ain

HSQLDB

Production Environment

JVMWeb Container/App Server

Controller

GSP

Dom

ain DB

WAR

Conclusion

Java’s capability, flexibility, backwards compatibility and community have lead to it’s unprecedented success.

However, these same things have become it’s Achilles heal.

The combination of Groovy and Grails simplifies the Java web platform while making developers more

productive and agile.

Starting with the end in mind

Starting with the end in mind

• Stage 1 - Conventions, MVC• Stage 2 - View, Styling, Feeds, Search• Stage 3 - Security and Users

Prerequisites

• Install Grails (Grails 1.0.4)http://grails.org/Download pick the appropriate distribution for your platform.

• Unpack / install it.

• Set the GRAILS_HOME environment variable and and <GRAILS_HOME>/bin to your path.

Verify Install

• at a command / shell prompt type grails

Stage 1 - Conventions, MVC

• Grails Application in 60 Seconds or Less,creating your first application

• Exploring the Grails Application structure and Conventions

• Creating Models, Views, and Controllers

• Model Relationships and Constraints

• Next Steps

Grails App < 60 secs

• Create a working directory

• From command / shell prompt in that directory type: grails create-app blogcd bloggrails run-app

• In a browser goto: http://localhost:8080/blog

Grails App < 60 secs

Congratulationsyou are a

programmer

Christopher M. Judd

President, Consultant, Author685 Farrington Drive

Worthington, Ohio 43085Phone: (614) 378-4119

Email: cjudd@juddsolutions.com

SUMMARY

Chris has 12 years of professional experience in object-oriented, web and mobile technologies as well as technical education and leadership. He has experience with all phases of the software development life-cycle, including requirements, analysis, architecture and design, implementation, testing, performance tuning, support, training and project leadership. In addition, he has provided technical instruction to thousands of information technology professionals though instructor led training, mentoring, conferences, user group meetings and co-authoring “Beginning Groovy and Grails”, “Enterprise Java Development on a Budget” and “Pro Eclipse JST”. He has provided services to a diverse group of industries including manufacturing, transportation, government, insurance, publishing, retail, content management, entertainment, service, and technology consulting.

EXPERIENCE

Java User Group Leader! July 2002 – PresetCentral Ohio Java User Group (COJUG)

! Coordinate and advertise monthly meetings on Java related topics.

Consultant! Sept 2004 – Sept 2008Nationwide Insurance

! Assisted in developing, architecting and performance testing a service oriented architecture (SOA) for selling and servicing insurance agreements using IBM’s Insurance Application Architecture (IAA) as the canonical business model. The services coordinated and orchestrated thirty six integration points including three policy administrative systems. The services were used by three front ends that supported agents and customers on the Internet.

! Assisted in developing and architecting an implementation of IBM’s conceptual Insurance Application Architecture (IAA) framework using Rational Application Developer, WebSphere Application Server, DB2 and Rational Software Modeler for UML modeling

! Profiled and performance tested insurance framework using HP Diagnostics Software. ! Architected, Designed and Developed an IAA based product modeler build on top of the Eclipse

Platform including Eclipse Modeling Framework (EMF) and Graphical Editing Framework (GEF)! Mentored a team of developers with no Java or web development experience to build web applications

using Groovy and Grails.! Mentored a team of developers in Java, J2EE, unit testing, configuration management and agile

methodologies! Set up and administered a continuous integration build server which provides code quality and metrics

reports using ANT, Maven, Cruise Control, CVS, Subversion and other open source tools

Chief Technical O"cer! Jan 2008 – May 2008gwizMOBILE

! Assisted in developing and architecting a mobile auto trading application and advertisement tool using Groovy, Grails and J2ME.

Consultant! June 2003 – Sept 2004CINTAS

! Mentored a team of 4 developers with almost no Java experience to become productive J2EE developers! Archited and developed a multi-tier reusable service based J2EE application using JBuilder, WebLogic,

Struts, Together and SQL Server for a new document management line of business! Taught JBuilder, J2EE, StarTeam, Linux, Dreamweaver, Struts and Object-Oriented Programming

Grails

Don’t forget to update your

resume.

So What Happened

• grails create-app blogcreated application structure &copied some files

• grails run-appstarted up the Jetty applicationserver and ran the application

App Structure & Conventions

A pretty standard application structure, . . . you can pretty well guess the purpose of the files and

directories.

Grails commands

Domain Class

• Blog and BlogEntry domain class:grails create-domain-class Bloggrails create-domain-class BlogEntry

• What just happened?Grails created two domain classes (Blog, BlogEntry) and two unit tests (BlogTest, BlogEntryTest)

BlogProperties:

• blogid, title, byline, dateCreated, lastUpdated

Method:

• toString()

class blog { String blogid String title String byline Date dateCreated Date lastUpdated

String toString () { return "Blog ${id} = ${title}" }}

BlogEntryProperties:

• title, body, dateCreated, and lastUpdated

Methods:

• toString() class BlogEntry { String title String body Date dateCreated Date lastUpdated

String toString () { return "BlogEntry ${id} = ${title}" }}

Controller and View• Create the controller.

grails create-controller Bloggrails create-controller BlogEntry

• What Happened?Grails created controller stubs for the domain classes, Blog and BlogEntry, and the corresponding unit tests.

Using Convention, the classes are named BlogController, BlogControllerTest, BlogEntryController, and BlogEntryControllerTest

Controller and View• Scaffolding auto generates views and controllers that

support basic CRUD (Create, Read, Update, and Delete) operations on domain objects.

• Edit BlogController and BlogEntryController, scaffold them by replacing the contents of the controller with: def scaffold = true

class BlogController { def scaffold = true}

Controller and View

Controller and View

What’s Missing

What’s Missing

• Data validity

What’s Missing

• Data validity

• Relationships

What’s Missing

• Data validity

• Relationships

• Not Pretty (Stage 2)

What’s Missing

• Data validity

• Relationships

• Not Pretty (Stage 2)

• User & Security (Stage 3)

class Blog { String blogid String title String byline Date dateCreated Date lastUpdated static constraints = { title(blank: false, size: 1..128) byline(nullable: true) blogid(blank: false) dateCreated() lastUpdated(nullable: true) }

String toString () { return "Blog ${id} = ${title}" }}

Data Validation (Constraints)

http://www.grails.org/Validationhttp://www.grails.org/Validation+Reference

Relationships (GORM)

http://www.grails.org/GORMhttp://www.grails.org/GORM+-+Defining+relationships

class Blog { String blogid String title String byline Date dateCreated Date lastUpdated static hasMany = [ blogEntries : BlogEntry] static constraints = { title(blank: false, size: 1..128) byline(nullable: true) blogid(blank: false) lastUpdated(nullable: true) } String toString () { return "Blog ${id} = ${title}" }}

Relationships (GORM)

http://www.grails.org/GORMhttp://www.grails.org/GORM+-+Defining+relationships

class BlogEntry { String title String body Date dateCreated Date lastUpdated

static belongsTo = [ Blog ] Blog blog static constraints = { title(blank: false, maxSize: 128) body(blank: false, maxSize: 10000) dateCreated() lastUpdated(nullable: true) }

String toString () { return "BlogEntry ${id} - ${title}" }}

Relationships (GORM)

http://www.grails.org/GORMhttp://www.grails.org/GORM+-+Defining+relationships

Database ConfigurationdataSource { pooled = true driverClassName = "org.hsqldb.jdbcDriver" username = "sa" password = ""}hibernate { cache.use_second_level_cache=true cache.use_query_cache=true cache.provider_class='com.opensymphony.oscache.hibernate.OSCacheProvider'}// environment specific settingsenvironments { development { dataSource { dbCreate = "create-drop" // one of 'create', 'create-drop','update' url = "jdbc:hsqldb:mem:devDB" } } test { dataSource { dbCreate = "update" url = "jdbc:hsqldb:mem:testDb" } } production { dataSource { dbCreate = "update" url = "jdbc:hsqldb:file:prodDb;shutdown=true" } }}

Generate Views and Controllers

Generate Views and Controllers

• grails generate-all Bloggrails generate-all BlogEntry

Generate Views and Controllers

• grails generate-all Bloggrails generate-all BlogEntry

• What happened?Grails used templates to generate create.gsp, list.gsp, edit.gsp, show.gsp for Blog and BlogEntry. (Where are they)

Grails used templates to generate BlogController.groovy and BlogEntryController.groovy (Where are they)

GORM Sidebar

• Save, Update, Delete, Get

• Dynamic Finders

http://grails.org/doc/1.0.x/guide/5.%20Object%20Relational%20Mapping%20(GORM).html#5.4%20Querying%20with%20GORM

Lab 41.Create the Blog Application.2.Create the Blog and Blog Entry Domain Classes.3.Create both controllers with Scaffolding.4.Run the application.5.Add Constraints to Blog and Blog Entry and the

relationships between them. 6.Run the application again.7.Generate the Views and Controllers for Blog and

BlogEntry. 8.Examine the views and controllers.

Recap• Installed Grails and validated

• Built firstapp in < 60 secs ;-)

• Explored application structure and conventions

• Create stage 1 of the Blog application, 2 Domain Classes with scaffolded Controllers and Views.

• Added Data Validation to the Domain Classes

• Created a 1:M relationship between Blog and BlogEntry

• Explored generated views and controllers

Stage 2 - View Styles• Layouts

• TagLibs

• Preview (AJAX)

• URL Mappings

• Feeds

• Search

Layout

Layout

Header

Sidebar

Footer

Body

SetupResources (Images, CSS, and JavaScript)

• Copy contents of <GrailsResources>/webapp to the blog project

Updating the layout (layouts/main.gsp, layouts/print.gsp, _sidebar.gsp)

• Copy contents of <GrailsResources>/views/layouts to blog project

• Copy contents of <GrailsResources>/views to blog project

TagLibs

• What is a taglib

• Previous Experiences with taglibs

• Grails Taglibs

• EntriesTagLib

BlogEntry ViewsList

• BlogEntryList.gsp

• Redirect BlogEntryController. Show to single list (Reuse)

• EntriesTagLib - Nice Dates

BlogEntry ViewsPrint

• Add Print output.Need a way to trigger print layoutNo Header, Footer, or sidebar

BlogEntry ViewsEdit

• BlogEntryEdit.gsp

BlogEntry ViewsAJAX Preview

• Add Ajax and Destination

• Add BlogEntryController.Preview to use preview template

• Create BlogEntry Preview Template

Lab 51.Copy Resources and Layouts2.Setup the new BlogEntry list display3.Redirect Show to use new list view4.Create EntriesTagLib for title and niceDate5.Review Print Layout and add Trigger to BlogEntry List6.Setup new BlogEntry Edit View7.Add Preview Functionality

URL Mappingclass UrlMappings { static mappings = { "/$controller/$action?/$id?"{ constraints { // apply constraints here } }

"/$blog/$year/$month?/$day?/$id?" { controller = "blogEntry" action = "displayEntry" constraints { year(matches: /\d{4}/) month(matches: /\d{2}/) day(matches: /\d{2}/) } } "/$blog/" { controller = "blogEntry" action = "list" } "500"(view:'/error') }}

UrlMapping

• Change the Header and Byline

• blog/list.gsp add to the linkparams="[blog: blogInstance.blogid]"

• blog/show.gsp add to the edit link<input type="hidden" name="blog" value="${blogInstance?.blogid}" />

Permalink• Add Permalink Generation to BlogEntry

public String toPermalink() { def sdf = new java.text.SimpleDateFormat("yyyy/MM/dd") return "/${blog?.blogid}/${sdf.format(dateCreated)}/${title.encodeAsNiceTitle()}.html"}

Permalink• Nice Title Codec

• Add BlogEntry Action DisplayEntryInsert from <GrailsResources>/controllers/BlogEntryController.displayEntry.txt

// strip all non word chars, convert to lowercase...class NiceTitleCodec { static encode = { str -> return str.toString().replaceAll("\\W", "-").toLowerCase() }}

PluginsA plugin is a Grails extension point. Conceptually, it is similar to the plugins found in modern IDEs.

A plugin is a technique to encapsulate functionality that can be reused across multiple applications.

Grails has a rich plugin community at last count, over 100 plugins for a partial list.

See: http://grails.org/Plugins

http://grails.org/Pluginshttp://www.grails.org/The+Plug-in+Developers+Guide

Feeds• Install the Feeds Plugin

grails install-plugin feeds

• Create a Feed Controllergrails create-controller feed

http://grails.org/Feeds+Plugin

def index = { redirect(action:list,params:params) } def list = { render(feedType:"rss", feedVersion:"2.0"){ title="CM Blogs" link="http://localhost:8080/blog/feed" description="Demo Blog Feed from CodeMash 2009" def blogs = BlogEntry.list([max: 5, sort: "dateCreated", order: "desc"]) blogs.each{blogEntry -> entry(blogEntry.title) { link="http://localhost:8080/blog/blogEntry/show/${blogEntry.id}" blogEntry.body } } } }

Feeds

• Add Link to sidebar

http://grails.org/Feeds+Plugin

<ul> <li><g:link controller='feed'> <img src="${createLinkTo(dir:'images',file:'feed-icon-16x16.jpg')}" alt="RSS"/>RSS </g:link> </li> <li><a class="home" href="${createLinkTo(dir:'')}">Home</a></li></ul>

Search• Install Grail’s Searchable Plugin

grails install-plugin searchable

• Make BlogEntry searchable

static searchable = { only = ["title", "body", "dateCreated", "blogs"] blog(component: true) } def indexedFields() { def fields = [:] // strip html before storing in index fields.title = title.replaceAll("\\<.*?\\>","") fields.body = body.replaceAll("\\<.*?\\>","") return fields }

Searchable• Make Blog Searchable

• http://localhost:8080/blog/seachable

static searchable = { only = ["blogid", "title", "byline"] root : false }

Searchable• Let’s Add a seach box to the application.

• Copy <GrailsResources>/view/blog/search.gsp

<div style="float: right; position: relative; margin-right: 7px; font-size: medium; "> <g:form url='[controller: "blog", action: "search"]' id="searchableForm" name="searchableForm" method="get"> <g:textField name="query" value="${params.query}" size="25"/> <input type="submit" value="Search" /> </g:form></div>

Lab 6

1.Setup UrlMappings http://localhost:8080/blog/jim and http://localhost:8080/blog/jim/yyyy/mm/dd

2.Create BlogEntry PermaLink 3.Setup RSS Feed4.Setup Search Functionality

Recap• Installed Grails and validated

• Built firstapp in < 60 secs ;-)

• Explored application structure and conventions

• Create stage 1 of the Blog application, 2 Domain Classes with scaffolded Controllers and Views.

• Added Data Validation to the Domain Classes

• Created a 1:M relationship between Blog and BlogEntry

• Explored generated views and controllers

Stage 3 - Security

• Discuss Security topics: User, Roles, Permissions, Realms

• Define User and Security Requirements

• Discuss Security Options

• Build it out

Security TopicsHigh Level: User (Subject, Principals) Roles, Permissions, Realms

Security TopicsHigh Level: User (Subject, Principals) Roles, Permissions, Realms

User / Subject

Security TopicsHigh Level: User (Subject, Principals) Roles, Permissions, Realms

User / Subject Principals• Username: jim• Account Number• PGP Key

Security TopicsHigh Level: User (Subject, Principals) Roles, Permissions, Realms

User / Subject Principals• Username: jim• Account Number• PGP Key

Role• User• Administrator

Security TopicsHigh Level: User (Subject, Principals) Roles, Permissions, Realms

User / Subject Principals• Username: jim• Account Number• PGP Key

Role• User• Administrator

Permission• blog (jim) : create, update, delete

Security TopicsHigh Level: User (Subject, Principals) Roles, Permissions, Realms

User / Subject Principals• Username: jim• Account Number• PGP Key

Role• User• Administrator

Permission• blog (jim) : create, update, delete

Realm: database, LDAP, . . .

User and Security Requirements

• User should have a name, email, password

• Blog has a User

• Only the User or an Administrator can modify a Blog / Blog Entry

• Users shouldn’t be able to modify each others blogs

Security Options• Spin your own (Loads of work & error prone)

• Use a Security Package

• Grails Plugins

• ACEGI (Spring Security)

• JSecurity

• . . .

• Integrate some other package

http://grails.org/Plugins#Security%20Pluginshttp://www.jsecurity.org

Security Options• Spin your own (Loads of work & error prone)

• Use a Security Package

• Grails Plugins

• ACEGI (Spring Security)

• JSecurity

• . . .

• Integrate some other package

http://grails.org/Plugins#Security%20Pluginshttp://www.jsecurity.org

Security Relationships

JSecurity Plugins• List available plugins:

grails list-plugins

• Install the JSecurity plugingrails install-plugin jsecurity 0.4-SNAPSHOT

• Setup JSecuritygrails quick-start

• Let’s ExploreDomain Classes, Views, Tag Libs

http://www.grails.org/JSecurity+Pluginhttp://www.grails.org/JSecurity+Plugin+-+Quick+Start

JSecurity Plugins• List available plugins:

grails list-plugins

• Install the JSecurity plugingrails install-plugin jsecurity 0.4-SNAPSHOT

• Setup JSecuritygrails quick-start

• Let’s ExploreDomain Classes, Views, Tag Libs

http://www.grails.org/JSecurity+Pluginhttp://www.grails.org/JSecurity+Plugin+-+Quick+Start

VERY IMPORTANT:We need this specific version.

Enhancing the User Class• User should have a name, email, password

Enhancing the User Class• User should have a name, email, password

class JsecUser { String username String passwordHash String fullName String email

static constraints = { username (blank: false) fullName (blank: false) email (blank: false, email: true) } String toString() { return "User ${id} - ${fullName}" }}

Enhancing Blog• Blog has a User

class Blog { String blogid String title String byline Date dateCreated Date lastUpdated JsecUser user static hasMany = [ blogEntries : BlogEntry] static constraints = { title(blank: false, size: 1..128) byline(nullable: true) blogid(blank: false) dateCreated() lastUpdated(nullable: true) } static searchable = { only = ["blogid", "title", "byline"] root : false } String toString () { return "Blog ${id} = ${title}" }}

Enhancing Blog• Blog has a User

class Blog { String blogid String title String byline Date dateCreated Date lastUpdated JsecUser user static hasMany = [ blogEntries : BlogEntry] static constraints = { title(blank: false, size: 1..128) byline(nullable: true) blogid(blank: false) dateCreated() lastUpdated(nullable: true) } static searchable = { only = ["blogid", "title", "byline"] root : false } String toString () { return "Blog ${id} = ${title}" }}

What’s missing

• No Predefined Admin User

Boot Strap Admin & Dilbertimport org.jsecurity.crypto.hash.Sha1Hashimport org.jsecurity.authz.permission.WildcardPermission

class BootStrap {

def init = { servletContext -> def basicPermission = new JsecPermission(type: "org.jsecurity.authz.permission.WildcardPermission", possibleActions: "*").save() def adminRole = new JsecRole(name: "administrator").save() def userRole = new JsecRole(name: "user").save() new JsecRolePermissionRel( role: adminRole, permission: basicPermission, target: "*", actions: "*").save() new JsecRolePermissionRel( role: userRole, permission: basicPermission, target: "blog:create,save", actions: "*").save() new JsecRolePermissionRel( role: userRole, permission: basicPermission, target: "blogEntry:create,save", actions: "*").save() new JsecRolePermissionRel( role: userRole, permission: basicPermission, target: "jsecUser:create,save", actions: "*").save()

Boot Strap Admin & Dilbertimport org.jsecurity.crypto.hash.Sha1Hashimport org.jsecurity.authz.permission.WildcardPermission

class BootStrap {

def init = { servletContext -> def basicPermission = new JsecPermission(type: "org.jsecurity.authz.permission.WildcardPermission", possibleActions: "*").save() def adminRole = new JsecRole(name: "administrator").save() def userRole = new JsecRole(name: "user").save() new JsecRolePermissionRel( role: adminRole, permission: basicPermission, target: "*", actions: "*").save() new JsecRolePermissionRel( role: userRole, permission: basicPermission, target: "blog:create,save", actions: "*").save() new JsecRolePermissionRel( role: userRole, permission: basicPermission, target: "blogEntry:create,save", actions: "*").save() new JsecRolePermissionRel( role: userRole, permission: basicPermission, target: "jsecUser:create,save", actions: "*").save()

Note:

If you are using a persistent datastore (DB), NON-Memory, Then you should put guard conditions around the bootstrapping of Permission, Roles, and Users

println "Building Admin User" def adminUser = new JsecUser(username: "admin",

passwordHash: new Sha1Hash("admin").toHex(), fullName: "Admin User", email: "admin@admin.com").save()new JsecUserRoleRel(user: adminUser, role: adminRole).save()

def blog = new Blog(title: "Blog: ${adminUser.fullName}", blogid: adminUser.username, user: adminUser)blog.save()

def dilbert = new JsecUser(username: "dilbert",

passwordHash: new Sha1Hash("password").toHex(), fullName: "Scott Adams", email: "dilbert@dilbert.com").save()new JsecUserRoleRel(user: dilbert, role: userRole).save()

new JsecUserPermissionRel(user: dilbert, permission: basicPermission,

target: "jsecUser:edit,update:${dilbert.id}",actions: "*").save() new JsecUserPermissionRel(user: dilbert, permission: basicPermission,

target: "blog:edit,update:${dilbert.id}", actions: "*").save()

new JsecUserPermissionRel(user: dilbert, permission: basicPermission,target: "blogEntry:edit,update:${dilbert.id}", actions: "*").save()

// Add Blognew Blog(title: "Blog: ${dilbert.fullName}",

blogid: dilbert.username, user: dilbert).save() }

. . .

What’s Missing

• Ability to create a new User

Views & Controller for JSecUser

Views & Controller for JSecUser• Do you remember how?

Views & Controller for JSecUser• Do you remember how?

• grails generate-all JSecUser

Views & Controller for JSecUser• Do you remember how?

• grails generate-all JSecUser

What’s missing

• Password should be hashed

• Auto create blog when new user saved

JsecUserController Enhancement• Hash the password

• On Save automatically create blog

JsecUserController Enhancement• Hash the password

• On Save automatically create blogimport org.jsecurity.crypto.hash.Sha1Hash

class JsecUserController {

. . .

def save = { def jsecUserInstance = new JsecUser(params) jsecUserInstance.passwordHash = new Sha1Hash(jsecUserInstance.passwordHash).toHex() if(!jsecUserInstance.hasErrors() && jsecUserInstance.save()) {

// Add Blognew Blog(title: "Blog: ${jsecUserInstance.fullName}",

blogid: jsecUserInstance.username, user: jsecUserInstance).save()

flash.message = "User ${jsecUserInstance.id} created" redirect(action:show,id:jsecUserInstance.id) } else { render(view:'create',model:[jsecUserInstance:jsecUserInstance]) } }

. . . }

What’s Missing

• Roles and Permissions aren’t being enforced.

Enforcement of Roles & Permissions

• Roles and Permissions are enforced using a Security Filter, . . . Yes, Filter as in Filter interceptor

• Also need to add Role and Permission when saving a new user.

Security Filterclass SecurityFilters {def filters = {

auth(controller: "(blog|blogEntry)", action: "(create|save)") {before = {

// This just means that the user must be authenticated. He does // not need any particular role or permission.accessControl { true }

} }

jsecUser(controller: "jsecUser", action: "(edit|update|delete)") {

before = {accessControl {

def userId = 0if (params.id) {

userId = JsecUser.get(params.id).id}role("administrator") || permission("jsecUser:${actionName ?: 'list'}:${userId}")

}}

}

blog(controller: "(blog|blogEntry)", action: "(edit|update|delete)") {before = {

accessControl {def userId = 0def blogId = 0def blogif (params.id) {

blog = Blog.get(params.id)userId = blog.user.id

}role("administrator") || permission("blog:${actionName ?: 'list'}:${userId}")

}}}}

http://grails.org/Filters

Security Filterclass SecurityFilters {def filters = {

auth(controller: "(blog|blogEntry)", action: "(create|save)") {before = {

// This just means that the user must be authenticated. He does // not need any particular role or permission.accessControl { true }

} }

jsecUser(controller: "jsecUser", action: "(edit|update|delete)") {

before = {accessControl {

def userId = 0if (params.id) {

userId = JsecUser.get(params.id).id}role("administrator") || permission("jsecUser:${actionName ?: 'list'}:${userId}")

}}

}

blog(controller: "(blog|blogEntry)", action: "(edit|update|delete)") {before = {

accessControl {def userId = 0def blogId = 0def blogif (params.id) {

blog = Blog.get(params.id)userId = blog.user.id

}role("administrator") || permission("blog:${actionName ?: 'list'}:${userId}")

}}}}

http://grails.org/Filters

JsecUserController Enchancementdef save = { def jsecUserInstance = new JsecUser(params) jsecUserInstance.passwordHash = new Sha1Hash(jsecUserInstance.passwordHash).toHex() if(!jsecUserInstance.hasErrors() && jsecUserInstance.save()) {

new Blog(title: "Blog: ${jsecUserInstance.fullName}", blogid: jsecUserInstance.username, user: jsecUserInstance).save()

def userRole = JsecRole.findByName("user")new JsecUserRoleRel(user: jsecUserInstance, role: userRole).save()

def basicPermission = JsecPermission.findByType("org.jsecurity.authz.permission.WildcardPermission")new JsecUserPermissionRel(

user: jsecUserInstance, permission: basicPermission, target: "jsecUser:edit,update:${jsecUserInstance.id}", actions: "*").save()

new JsecUserPermissionRel( user: jsecUserInstance, permission: basicPermission, target: "blog:edit,update:${jsecUserInstance.id}", actions: "*").save()

new JsecUserPermissionRel( user: jsecUserInstance, permission: basicPermission, target: "blogEntry:edit,update:${jsecUserInstance.id}", actions: "*").save()

flash.message = "User ${jsecUserInstance.id} created" redirect(action:show,id:jsecUserInstance.id) } else { render(view:'create',model:[jsecUserInstance:jsecUserInstance]) } }

JsecUserController Enchancementdef save = { def jsecUserInstance = new JsecUser(params) jsecUserInstance.passwordHash = new Sha1Hash(jsecUserInstance.passwordHash).toHex() if(!jsecUserInstance.hasErrors() && jsecUserInstance.save()) {

new Blog(title: "Blog: ${jsecUserInstance.fullName}", blogid: jsecUserInstance.username, user: jsecUserInstance).save()

def userRole = JsecRole.findByName("user")new JsecUserRoleRel(user: jsecUserInstance, role: userRole).save()

def basicPermission = JsecPermission.findByType("org.jsecurity.authz.permission.WildcardPermission")new JsecUserPermissionRel(

user: jsecUserInstance, permission: basicPermission, target: "jsecUser:edit,update:${jsecUserInstance.id}", actions: "*").save()

new JsecUserPermissionRel( user: jsecUserInstance, permission: basicPermission, target: "blog:edit,update:${jsecUserInstance.id}", actions: "*").save()

new JsecUserPermissionRel( user: jsecUserInstance, permission: basicPermission, target: "blogEntry:edit,update:${jsecUserInstance.id}", actions: "*").save()

flash.message = "User ${jsecUserInstance.id} created" redirect(action:show,id:jsecUserInstance.id) } else { render(view:'create',model:[jsecUserInstance:jsecUserInstance]) } }

Look Familiar?Take a look at:

BootStrap.groovy

What’s Missing

• User views (List, Show, Edit, Create) shouldn’t show the password in the clear

• Password label needs to be adjusted.

Enhance User Views. . .

<tr class="prop"> <td valign="top" class="name"><label for="username">Username:</label> </td> <td valign="top" class="value ${hasErrors(bean:jsecUserInstance,field:'username','errors')}"> <input type="text" id="username" name="username" value="${fieldValue(bean:jsecUserInstance,field:'username')}" /></td></tr>

<tr class="prop"> <td valign="top" class="name"><label for="passwordHash">Password:</label> </td> <td valign="top" class="value ${hasErrors(bean:jsecUserInstance,field:'passwordHash','errors')}"> <input type="password" id="passwordHash" name="passwordHash" value="${fieldValue(bean:jsecUserInstance,field:'passwordHash')}" /></td></tr>

. . .

Enhance User Views. . .

<tr class="prop"> <td valign="top" class="name"><label for="username">Username:</label> </td> <td valign="top" class="value ${hasErrors(bean:jsecUserInstance,field:'username','errors')}"> <input type="text" id="username" name="username" value="${fieldValue(bean:jsecUserInstance,field:'username')}" /></td></tr>

<tr class="prop"> <td valign="top" class="name"><label for="passwordHash">Password:</label> </td> <td valign="top" class="value ${hasErrors(bean:jsecUserInstance,field:'passwordHash','errors')}"> <input type="password" id="passwordHash" name="passwordHash" value="${fieldValue(bean:jsecUserInstance,field:'passwordHash')}" /></td></tr>

. . . Go ahead and make the corresponding adjustments to the other user views as appropriate.

(list.gsp, create.gsp, show.gsp, edit.gsp)

What’s Missing

• When creating a blog entry the user shouldn’t have to specify which user the blog is related to.

Blog / User automation

• Remove User fields from the Blog views.

• Update BlogEntryController save. def save = {

def blogEntryInstance = new BlogEntry(params) if (blogEntryInstance.hasErrors()) { render(view:'create',model:[blogEntryInstance:blogEntryInstance]) return } else { def subject = SecurityUtils.subject def user = JsecUser.findByUsername(subject.principal) def blog = Blog.findByUser(user) log.debug "Adding new entry to blog ${blog?.title}" blog?.addToBlogEntries(blogEntryInstance)?.save() blogEntryInstance.save() flash.message = "BlogEntry ${blogEntryInstance.id} created" redirect(action:show,id:blogEntryInstance.id) } }

Update Url Mapping

"/$blog/" { controller = "blogEntry" action = "homePage" }

What’s Missing

• Need a way to logout

• Should be able to Register a new user from the login screen.

Register New User<tr>

<td /><!--

<td><input type="submit" value="Sign in" /></td>--><td><g:actionSubmit value="Sign in" action="signIn" /><g:actionSubmit value="Register" action="register" /></td>

</tr></tbody>

login.gsp

. . .def register = {

redirect(controller: 'jsecUser', action: 'create')}

. . .

AuthController.groovy

Congratulations!!!

And to think, this morning you didn’t know Groovy and Grails.

Recap• Reviewed Security Concepts: Subject, Principals, Roles,

Permissions, and Realms

• Reviewed Security Options and setup JSecurity Plugin

• Enhanced the JsecUser Class and related it to Blog

• Boot Strapped the Admin user are setup Roles and Persmissions

• Generated JsecUser Views and Controller

• User SecurityFilters to enforce Roles and Permissions

• Created ability to Logout, Login / Register

Groovy & Grails Training

Groovy Essentials (2 days) Grails Essentials (2 days)•Groovy language basics

•Java Comparison •Tools and IDEs •Language constructs •Groovy Strings •Closures •Collections •Scripting

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•Advanced Groovy language features •Meta-programming •Expando •Domain Specific Languages

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Free Groovy & Grails Overview (1 1/2 hours)

•Grails basics •Conventions •MVC •Architecture •Environments

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•Controllers •Writing actions •Binding data •Flash scope •Pagination •Interception and Filtering

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•Services and Jobs •Plug-ins

•Finding and Installing •Creating

•Web Services •Authentication and Authorization

Groovy & Grails JumpStart (30-60 days)

Resources• Introduction to Groovy• Groovy Basics• More Advanced Groovy• Introduction to Grails• Building the User Interface• Building Domains and Services• Security in Grails• Web 2.0—Ajax and Friends• Web Services• Reporting• Batch Processing• Deploying and Upgrading• Alternative Clients

Resources• Grails

–grails.codehaus.org or www.grails.org–Grails Quick Start

•grails.codehaus.org/Quick+Start–User Guide

•grails.org/doc/1.0.x/• Books Coming

Soon

Conclusion

• Blog: http://juddsolutions.blogspot.comhttp://jshingler.blogspot.com

• Email: CJudd@JuddSolutions.comShinglerJim@gmail.com

• LinkedIn: http://www.linkedin.com/in/christophermjuddhttp://www.linkedin.com/in/jimshingler

• Twitter: http://www.twitter.com/jshingler

Thank You for your time