Date post: | 25-Dec-2015 |
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Agenda
• Application Servers
• What is JBoss
• JBoss features
• Architecture of JBoss
• Installation and running the server
• Testing the installation
Application Servers
1. Provide a runtime for mission-critical applications;2. Solve the many (client) to Few (resources) problem;3. User code does not have to deal with: - security - Transactions -Threading - Pooling - Clustering - Caching - Connectors - Messaging - ……
What is JBoss
An open source J2EE server; Founded by Marc Fleury in 1999; Backed by a community of developers; Yet another Java AppServer .
What made JBoss Special
Free, open-source product; professional supporting, consulting, and training
- Commercial Servers at $10k - $100k LGPL licensed - Free use/Distribute/Embed Developer friendly - No pre – compilation steps, etc Innovative design - Lightweight, modular, dynamic
Architectural Innovations
• The JBoss Microkernel - A light weight component framework that wires together
a set of services;
- Services are de-coupled, innovations are routed through an internal bus;
Architectural Innovations
Aspect Oriented Design
- Interceptors applied using Dynamic Proxies and traditional OOD techniques;
Instant Clustering;
JBoss Microcontainer
• The JBoss Microcontainer is a refactoring of JBoss's JMX Microkernel to support direct POJO deployment and standalone use outside the JBoss application server.
- All the features of the JMX Microkernel
- Direct POJO deployment (no need for Standard/XMBean or MBeanProxy)
- Direct IOC style dependency injection
- Improved lifecycle management
- Additional control over dependencies
- Transparent AOP integration
- Virtual File System
- Virtual Deployment Framework
- OSGi classloading
Jboss Today
Most used application server in Development; 20 million downloads; Large jboss.org community;
- 250,000+ users;
- 500+ contributors, over time, ~30 at any time;
- 300,000 forum posts;
- x10 bigger community than any open source server;
JBoss AS 5
JEE 5 certified application server; Based on POJO Microcontainer; - Aspectized light weight IoC container;
- JMX stays, become an aspect of POJO services;
New implementations of core services; - JBoss messaging;
- JBoss transactions;
JBoss SEAM; JBoss webserver (Tomcat on steroids);
Installing JBoss AS
Prerequisites: - JDK 1.5 or above
- JAVA_HOME environment variable pointing to JDK
Download the JBoss AS you want to install:• http://www.jboss.org/jbossas/download• Platform Independent Zip Archive
Extract the archive in the directory you choose Run ( For Windows, run.bat, for Linux, run.sh);
Alternative Installation: JEMS
GUI Installer utility Run through Java Wed Start or download and
run locally: - http://www.jboss.org/jemsinstaller/downloads
- ‘java -jar jems-installer-1.2.1.CR4.jar’
Choose between different profiles; - All, Default, Minimal
- EJB3, EJB3 clustered
Customize services installed; Secure admin consoles;
Directory Structure
/bin Startup/Shutdown Script
/client Client-side jars need to communicate with JBoss
/docs Configuration file DTD’s, licenses, schemas data source configuration examples
/lib Microkernel librariesDo not pub your application library here
/server Server configurations
Server Configuration Structure
/conf Jboss static configuration filesJboss service.xml: bootstrap config file for JMX microkernel
/data Used by services requiring permanent storage (hypersonic, JBossMQ, SFSB..)
/deploy Default location monitored by hot development service, Put your application archive here
/lib Static java library directory. Libraries are loaded in the shared class path server startup.
/log Directory for Jboss log files
/tmp, /work
Temporary directories
Start the server
• To launch an instance of JBoss
run [–c <configuration>] if –c parameter is not specified, default configuration is used
Microkernel benefits for SOA architecture
• Microkernel approach ideal for ISV and OEM Easily remove the services you don’t need Tight footprint and modular codebase and hot
deploy/remove/redeploy JBoss is a TRUE Service Oriented
Architecture (SOA)
Tomcat standalone or Tomcat inside JBoss ?
• Better JBoss deployer Hot deployment Deployment of nested archives (EARs, SARs) Redeployment Automatic undeployment
• Advanced clustering• Integrated J2EE stack within one VM
Deployment descriptor Optimized local calls Integrated security
• AOP in JBoss 4.0 available in Tomcat components and webapps• Easy to use class loader• Nukes
JBoss IDE
• JBoss IDE is based on Eclipse. Series of plugins for Eclipse
• The debugging and monitoring of JBoss servers and the control of their life cycle (start/stop).
• A very comfortable and sophisticated support for XDoclet Support completion and generation Support for AOP (completion and generation).
• An easy way to configure and deploy the packaging layout of archives (packed or exploded)