Java servlet .

• Java servlet

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Java (programming language) Servlet

1 Java Servlet technology provides Web developers with a simple, consistent

mechanism for extending the functionality of a Web server and for accessing existing business systems. Servlets are server-side

Java EE components that generate responses (typically HTML pages) to

requests (typically HTTP requests) from clients. A servlet can almost be thought of as an applet that runs on the server side—

without a face.https://store.theartofservice.com/the-java-servlet-toolkit.html

Java (programming language) JavaServer Pages

1 JavaServer Pages (JSP) are server-side Java EE components that generate

responses, typically HTML pages, to HTTP requests from clients. JSPs embed Java

code in an HTML page by using the special delimiters <% and %>. A JSP is

compiled to a Java servlet, a Java application in its own right, the first time it is accessed. After that, the generated

servlet creates the response.


Application server Java application servers

1 Some Java Application Servers leave off many Java EE features like EJB

and JMS including Tomcat from Apache, and Jetty from Eclipse

Foundation. Their focus is more on Java Servlets and JavaServer Pages.


Google Code - App Engine

1 With App Engine's Java runtime environment, you can build your app

using standard Java technologies, including the JVM, Java servlets, and the Java programming language—or

any other language using a JVM-based interpreter or compiler, such

as JavaScript or Ruby


HTTP cookie - URL (query string)

1 A more precise technique is based on embedding information into URLs. The query string part of the URL is

the one that is typically used for this purpose, but other parts can be used

as well. The Java Servlet and PHP session mechanisms both use this method if cookies are not enabled.


Google+ - Technologies

1 According to Joseph Smarr, one of the Google+ team's technical leads,

Google+ is a typical Google web application: it uses Java servlets for the server code and JavaScript for the browser-side of the UI, largely

built with Google's Closure framework, including the JavaScript compiler and the template system


Java applet - Similar technologies

1 A Java Servlet is sometimes informally compared to be "like" a

server-side applet, but it is different in its language, functions, and in

each of the characteristics described here about applets.


Website - Dynamic website

1 There are a wide range of software systems, such as CGI, Java Servlets and Java Server Pages (JSP), Active

Server Pages and ColdFusion (CFML) that are available to generate

dynamic web systems and dynamic sites


Apache Struts

1 Apache Struts is an open-source web application framework for developing Java

EE web applications. It uses and extends the Java Servlet API to encourage developers to

adopt a model–view–controller (MVC) architecture. It was originally created by Craig McClanahan and donated to the

Apache Foundation in May, 2000. Formerly located under the Apache Jakarta Project and

known as Jakarta Struts, it became a top-level Apache project in 2005.


Apache Struts - Design goals and overview

1 The information is then either handed over to a Java Servlet which

interacts with a database and produces an HTML-formatted response, or it is given to a

JavaServer Pages (JSP) document that intermingles HTML and Java code to achieve the same result


Websites - Dynamic website

1 There are a wide range of software systems, such as Common Gateway Interface|CGI, Java Servlets and Java

Server Pages (JSP), Active Server Pages and ColdFusion (CFML) that are available to generate dynamic web systems and dynamic sites


Lift (web framework) - Design goals and overview

1 Lift web applications are thus packaged as WAR file format (Sun)|WAR files and deployed on any Java

Servlet|servlet 2.4 engine (for example, Apache Tomcat|Tomcat

5.5.xx, Jetty (web server)|Jetty 6.0, etc.)


HTTP cookie - URL (query string)

1 A more precise technique is based on embedding information into URLs.

The query string part of the Uniform Resource Locator|URL is the one that is typically used for this purpose, but other parts can be used as well. The

Java Servlet and PHP session mechanisms both use this method if

cookies are not enabled.


Web apps - Structure

1 A web browser is the first tier (presentation), an engine using some

dynamic Web content technology (such as Active Server Pages|ASP, ASP.NET,

Common Gateway Interface|CGI, ColdFusion, Java Servlet|JSP/Java, PHP, Perl, Python (programming language)|Python, Ruby on Rails or Struts2) is the

middle tier (application logic), and a database is the third tier (storage)


Web development - Server side coding

1 * Java (programming language)|Java, e.g. Java Servlets, Java Server Pages|JSP or WebObjects


Google App Engine - Runtimes and frameworks

1 Core to this is the Java Servlet|servlet 2.5 technology using the

open-source Jetty (web server)|Jetty Web Server, along with

accompanying technologies such as JavaServer Pages|JSP


JavaServer Pages - Overview

1 Architecturally, JSP may be viewed as a high-level Abstraction (computer

science)|abstraction of Java servlets. JSPs are translated into Java Servlet|

servlets at runtime; each JSP's servlet is cached and re-used until

the original JSP is modified.[ http://java.sun.com/j2ee/tutorial/1_3-fcs/doc/JSPIntro4.html The Life Cycle of a JSP Page (Sun documentation)]


JavaServer Pages - Overview

1 JSP can be used independently or as the view component of a server-side model–

view–controller design, normally with JavaBeans as the model and Java servlets (or a framework such as Apache Struts) as

the controller. This is a type of Model 2 architecture.[

http://www.javaworld.com/javaworld/jw-12-1999/jw-12-ssj-jspmvc.html Understanding

JavaServer Pages Model 2 architecture (JavaWorld)]


Spring Framework - Modules

1 * 'Model–view–controller': an HTTP- and Java Servlet API|servlet-based

framework providing hooks for extension and customization for web

applications and RESTful web services.


Spring Framework - Model-view-controller framework

1 This tight coupling to the Java Servlet|Servlet API is seen by some as a failure on the part of the Spring

developers to offer a high-level abstraction for web-based

applications



1 * [ http://static.springsource.org/spring/docs/3.2.x/javadoc-api/org/springfram

ework/web/portlet/HandlerInterceptor.html

HandlerInterceptor]: interception of incoming requests comparable but not equal to Java Servlet|Servlet filters (use is optional and not

controlled by DispatcherServlet).https://store.theartofservice.com/the-java-servlet-toolkit.html


1 The abstractions offered by these interfaces are powerful, so to allow

for a set of variations in their implementations, Spring MVC ships with implementations of all these interfaces and together offers a

feature set on top of the Java Servlet|Servlet API


Jenkins (software)

1 It is a server-based system running in a Java Servlet#Servlet containers|servlet container such as Apache

Tomcat


Application server - Java application servers

1 Some Java Application Servers leave off many Java EE features like EJB and JMS including Apache Tomcat|

Tomcat from Apache Software Foundation|Apache, and Jetty (web

server)|Jetty from Eclipse Foundation. Their focus is more on Java Servlets

and JavaServer Pages.


Hudson (software)

1 'Hudson' is a continuous integration (CI) tool written in Java

(programming language)|Java, which runs in a Java Servlet#Servlet

containers|servlet container, such as Apache Tomcat or the Glassfish

Application Server|GlassFish application server


Common Object Request Broker Architecture - Benefits

1 For example, the design of a multitier architecture is made simple using

Java Servlets in the web server and various CORBA servers containing

the business logic and wrapping the database accesses


Web sites - Dynamic website


Server Pages (JSP), Active Server Pages and ColdFusion (CFML) that

are available to generate Programming_languages_used_in_mo

st_popular_websites|dynamic web systems and dynamic sites


Apache Wicket - Example

1 : The Java servlet|servlet application Deployment Descriptor, which

installs Wicket as the default handler for the servlet and arranges for

HelloWorldApplication to be instantiated at startup.


Apache Click

1 'Apache Click' is a modern page and component oriented web application

framework for the Java (programming language)|Java

language and is built on top of the Java Servlet application programming

interface|API.


Apache Click - Overview

1 Click takes a pragmatic approach and expose few abstractions to learn

and understand. The Java Servlet application programming interface|API is fully exposed to the developer which eases the upgrade path from

an action based framework to a component based one.


Apache MyFaces - Core

1 The latest release of MyFaces Core is 2.1.12. It requires Java (programming

language)|Java 1.5 or later, JavaServer Pages|JSP 2.1, JavaServer Pages Standard Tag Library|JSTL 1.2

and a Java Servlet 2.5 implementation.


Tomcat

1 * Apache Tomcat, an open-source Java Servlet Container developed by the Apache Software

Foundation


Java applet - Similar technologies

1 A Java Servlet is sometimes informally compared to be like a

server-side applet, but it is different in its language, functions, and in

each of the characteristics described here about applets.


Jetty (web server)

1 Jetty supports the latest Java Servlet API (with JavaServer Pages|JSP

support) as well as protocols SPDY and WebSocket.


Apache Tomcat

1 'Apache Tomcat' (or simply 'Tomcat', formerly also Jakarta Tomcat) is an open source web

server and Java Servlet|servlet web container|container developed by the Apache Software

Foundation (ASF). Tomcat implements the Java Servlet and the JavaServer Pages (JSP) specifications from Sun Microsystems, and

provides a pure Java (programming language)|Java Hypertext Transfer Protocol|

HTTP web server environment for Java (programming language)|Java code to run in.


Apache Tomcat - Catalina

1 Catalina implements Sun Microsystems' specifications for Java servlet|servlet and JavaServer Pages

(JSP)


Terracotta, Inc. - Products and Projects

1 * 'Web Sessions': a commercial product that provides high

availability for Java Servlet Sessions, allowing user session data to survive

server restarts and failures


WebWork - Design goals and overview

1 The information is then either handed over to a Java Servlet which

processes it, interacts with a database and produces an HyperText Markup Language|HTML-formatted

response, or it is given to a JavaServer Pages (JSP) document which intermingles HTML and Java code to achieve the same result


Hibernate (Java) - Integration

1 Hibernate can be used both in standalone Java (programming language)|Java

applications and in Java EE applications using Java Servlet|servlets, EJB session beans, and

JBI service components. It can also be included as a feature in other programming languages. For example, Adobe Systems|

Adobe integrated Hibernate into version 9 of ColdFusion (which runs on J2EE app servers) with an abstraction layer of new functions

and syntax added into CFML.


Vaadin - Features

1 Vaadin applications can be deployed as Java servlets for any Java web

server, including Google App Engine. Applications can also be deployed as portlets to any Java portal like eXo

Platform. Vaadin also has some deeper integration with the Liferay|

Liferay Portal.


Servlet - Introduction

1 Technically speaking, a servlet is a Java class in Java EE that conforms to

the Java Servlet API,[ http://docs.oracle.com/javaee/6/api/javax/servlet/Servlet.html Java Servlet

API] a standard for implementing Java classes which respond to

requests


Java view technologies and frameworks - At a glance

1 * JavaServer Faces (JSF), Apache Tapestry and Apache Wicket are

competing component-based technologies, abstracting the

Stateless protocol|stateless HTTP request-response cycle and the Java

Servlet API behind an Object-oriented programming|object-oriented, event-

driven component model.


JMX - Support

1 * JMX is also supported by Java Servlet|servlet containers such as

Apache Tomcat.[ http://tomcat.apache.org/tomcat-6.0-doc/monitoring.html Apache Tomcat

6.0: Monitoring and Managing Tomcat] (Tomcat manual) Jetty (web

server)


Adobe JRun

1 'JRun' is a Java Platform, Enterprise Edition|J2EE application server,

originally developed in 1997 as a Java Servlet engine by Live Software

and subsequently purchased by Allaire Corporation|Allaire, who

brought out the first J2EE compliant version


IBM PureQuery - Feature summary

1 pureQuery can be used both in Computer software|standalone Java Platform, Standard Edition|Java SE

applications and in Java EE applications using Java Servlet|servlets or EJB session beans


FastCGI - Language bindings for the FastCGI API

1 * Java (programming language)|Java [ http://jfastcgi.sourceforge.net/

jFastCGI, a Java Servlet implementing FastCGI protocol]


Common Gateway Interface - Alternatives

1 This is the approach taken by Java EE, which runs Java code in a Java servlet container in order to serve

dynamic content and optionally static content


Quercus (software) - Early licensing

1 As long as you used standard JSP or Java Servlet APIs you did not have any issues.


Comet (programming) - First Comet applications

1 Pushlets were based on server-side Java servlets, and a client-side JavaScript library.Just van den

Broecke (3 January 2007)


Jakarta Struts

1 'Apache Struts' is a project developing an open-source web application framework for Java EE web application development that promotes a model–view–controller (MVC) architectural approach through

extensions the Java Servlet web API. The original framework was formerly a part of the Apache Jakarta Project and known as 'Jakarta Struts' but split off into its own

top-level Apache project in 2005.


Jakarta Struts - Design goals and overview

1 In a standard Java Platform, Enterprise Edition|Java EE web application, the

client will typically call to the server via a Form (web)|web form. The information is then either handed over to a Java Servlet

which interacts with a database and produces an HTML-formatted response, or it is given to a JavaServer Pages (JSP) document that intermingles HTML and Java code to achieve the same result.


OpenLaszlo

1 OpenLaszlo Server is a Java (programming language)|Java servlet that compiles LZX applications into

executable binaries for targeted run-time environments.


OpenLaszlo - Deployment

1 Laszlo applications can be deployed as traditional Java servlets, which are

compiled and returned to the browser dynamically. This method

requires that the web server is also running the OpenLaszlo server.


Web container

1 'Web container' (also known as a Servlet container) is the component of a web server that interacts with Java (programming language)|Java

servlets


Web container - List of Servlet containers

1 The following is a list of applications which implement the Java Servlet

specification from Sun Microsystems, divided depending on whether they

are directly sold or not.


List of computer term etymologies - J

1 * 'Jakarta Project' — a project constituted by Sun Microsystems|Sun

and Apache Software Foundation|Apache to create a web server for Java (programming language)|Java Java servlet|servlets and JavaServer

Pages|JSPs.


Java Servlets - Introduction


the Java Servlet API,[ http://docs.oracle.com/javaee/6/api/javax/servlet/Servlet.html Java Servlet

API] a standard for implementing Java classes which respond to

requests


Oracle iPlanet Web Server

1 Oracle iPlanet Web Server is available on Solaris (Operating

System)|Solaris, Microsoft Windows|Windows, HP-UX, IBM AIX|AIX, Linux|

GNU/Linux, supports JavaServer Pages|JSP and Java Servlet

technologies, PHP, Netscape Server Application Programming Interface|NSAPI, Common Gateway Interface|

CGI, and Adobe ColdFusion|ColdFusion.


List of graphical user interface builders and rapid application development tools - Web-based RAD tools

1 * Grails (framework)|Grails is an open-source Groovy (programming

language)|Groovy-based high-productivity framework inspired by

Ruby on Rails and following the Convention over configuration|coding

by convention paradigm. Grails applications can run in standard Java

servlet containers.


Java Naming and Directory Interface

1 * allowing a Java Servlet to look up configuration information provided

by the hosting web container


Struts2

1 'Apache Struts' was an open-source web application framework for developing Java EE web applications. It uses and extends the Java Servlet application programming interface|API

to encourage developers to adopt a model–view–controller (MVC) architecture. It was

originally created by Craig McClanahan and donated to the Apache Foundation in May, 2000. Formerly located under the Apache

Jakarta Project and known as 'Jakarta Struts', it became a top-level Apache project in 2005.


Applet - Applet vs. Subroutine

1 * Applets execute only on the client platform environment of a system, as contrasted from Java Servlet|servlet.

As such, an applet provides functionality or performance beyond

the default capabilities of its container (the browser).


Google Developers - App Engine

1 With App Engine's Java runtime environment, one can build their app

using standard Java technologies, including the JVM, Java servlets, and the Java programming language—or

any other language using a JVM-based interpreter or compiler, such

as JavaScript or Ruby


Web site - Dynamic website


Server Pages (JSP), Active Server Pages and ColdFusion (CFML) that

are available to generate Programming languages used in

most popular websites|dynamic web systems and dynamic sites


JBoss Enterprise Application Platform - Product components and features

1 * Web application services, including Apache Tomcat for JavaServer Pages (JSP) and Java

Servlets


JBoss Enterprise Application Platform - Related products

1 ** Apache Tomcat – including Java Servlet and

JavaServer Pages


Obix programming language - Development environment

1 * write web applications using Java's JavaServer Pages|JSP and/or Java Servlet|

servlet technology


Sun Java System Application Server - Overview

1 GlassFish is the reference implementation of Java EE and as such supports Enterprise

JavaBeans, Java Persistence API|JPA, JavaServer Faces, Java Message Service|JMS, Remote Method Invocation|RMI, JavaServer

Pages, Java Servlet|servlets, etc. This allows developers to create enterprise applications

that are portable and scalable, and that integrate with legacy technologies. Optional

components can also be installed for additional services.


Google Plus - Technologies

1 According to Joseph Smarr, one of the Google+ team's technical leads,

Google+ is a typical Google web application: it uses Java Servlet|Java

servlets for the server code and JavaScript for the browser-side of the UI, largely built with Google's Google

Closure Tools|Closure framework, including the JavaScript compiler and

the template systemhttps://store.theartofservice.com/the-java-servlet-toolkit.html

Deployment Descriptor - Types

1 For example, the web.xml file is a standard Java EE deployment

descriptor, specified in the Java Servlet specification, but the sun-

web.xml file contains configuration data specific to the Sun GlassFish Enterprise Server implementation.

[http://docs.sun.com/app/docs/doc/820-4502/beaqj?l=ena=view Sun Java

System Application Server Descriptors], retrieved 2010-07-13


WAR file format (Sun)

1 In software engineering, a 'WAR' file (or 'W'eb application 'AR'chive) is a

JAR (file format)|JAR file used to distribute a collection of JavaServer

Pages, Java Servlets, Java (programming language)|Java class (file format)|classes, XML files, tag

libraries, static web pages (HTML and related files) and other resources

that together constitute a web application.


WAR file format (Sun) - Content and structure

1 If the web application uses servlets, then the servlet container uses

web.xml to ascertain to which Java Servlet|servlet a Uniform Resource Locator|URL request will be routed


Servlets - Introduction


the Java Servlet API,[http://docs.oracle.com/javaee/6/

api/javax/servlet/Servlet.html Java Servlet API] a standard for

implementing Java classes which respond to requests


Oozie

1 'Oozie' is a workflow scheduler system to manage 'Apache Hadoop|

Hadoop' jobs. It is a server-based Workflow Engine specialized in

running workflow jobs with actions that run Hadoop MapReduce and Pig jobs. Oozie is implemented as a Java Web-Application that runs in a Java

Servlet-Container.


OMG IDL - Benefits

1 For example, the design of a multitier architecture is made simple using

Java Servlets in the web server and various CORBA servers containing

the business logic and wrapping the database accesses


Gerrit (software) - Design

1 Originally written in Python (language)|Python like Rietveld, it is now written in Java (programming

language)|Java (Java Platform, Enterprise Edition|Java EE Java Servlet|Servlet) with SQL since

version 2. Gerrit uses Google Web Toolkit to generate front-end

JavaScript code from Java source.


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