Java EE | Apache TomEE - Java EE Web Profile on Tomcat | Jonathan Gallimore
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Apache TomEE combines Tomcat with Java EE to provide a lightweight, certified web profile. It supports various components like OpenEJB, MyFaces, and OpenJPA while maintaining a small footprint of only 24MB. TomEE offers enhanced features for transactions, connection pooling, and persistence, making it more robust than plain Tomcat.
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- 2. What is Apache TomEE • Tomcat + Java EE = TomEE • Complete Tomcat with nothing taken away • Java EE 6 Web profile certified stack • All Apache components • MyFaces • OpenEJB • OpenWebBeans • OpenJPA 2 Monday, 31 October 11
- 3. Philosophy • Be small, be certified, be Tomcat • Integrate OpenEJB into Tomcat, not the other way around • Get more, don’t give up anything • Leverage existing Tomcat features (JNDI, Security) • Lightweight • just 24MB • no extra memory requirement • No need to learn new server environment • Use existing IDE tools 3 Monday, 31 October 11
- 4. Flavours of TomEE • Apache TomEE Web Profile (Java EE 6 certified) • OpenEJB • OpenWebBeans • OpenJPA • Bean validation • MyFaces • Apache TomEE Plus (not Java EE 6 certified) • CXF • ActiveMQ • Geronimo connector • Embedded Apache TomEE 4 Monday, 31 October 11
- 5. Stats • Size: the entire Web Profile is only 24Mb • Memory usage: very little required, passed the TCK without changing any default JVM memory settings • Agility: the server can go through a start/deploy/test/ undeploy/stop cycle in 2-3 seconds, when run in embedded mode 5 Monday, 31 October 11
- 6. Certification • Certified on Amazon EC2 • t1.micro linux images, lot’s of them • 100 spot instances going at once (sometimes more)! • Each has 613MB memory max • Use default JVM memory settings • Current certified OSs • Amazon Linux AMI 2011.09, EBS boot, 32-bit EC2 t1.micro • Amazon Linux AMI 2011.09, EBS boot, 32-bit EC2 m1.small • Amazon Linux AMI 2011.09, EBS boot, 32-bit EC2 c1.medium 6 Monday, 31 October 11
- 7. Getting started • Unzip • Start with usual Catalina scripts or services • Deploy application .war or .ear in webapps • Console application at http://localhost:8080/openejb • Or deploy openejb.war in any standard Tomcat 7 installation 7 Monday, 31 October 11
- 8. Demo • Moviefun sample - demonstrates: • Servlets • CDI • JSF • EJBs • JPA • Available in OpenEJB source code repository • Over 50 different examples available for various Java EE features 8 Monday, 31 October 11
- 9. Why not just use Tomcat? • Plain Tomcat doesn’t have support for: • Transactions • Transaction aware connection pooling • @Resource • @PersistenceUnit • @Inject • @EJB • Global JNDI (java:module, java:app, java:global) • Are you adding libraries to provide EE features (e.g. persistence or CDI)? 9 Monday, 31 October 11
- 10. Configuration • Resources configured in conf/openejb.xml • Simple XML + properties format • Tags match Annotation names • <Resource id="moviesDatabase" type="DataSource"> • Can be injected using this code • @Resource DataSource moviesDatabase 10 Monday, 31 October 11
- 11. Transactions • Connection pooling is Transaction aware • Everyone in same transaction, shares same connection • Servlets, ManagedBeans, etc. can start transactions • @Resource UserTransaction transaction; • No need for EJBs to use transactions 11 Monday, 31 October 11
- 12. Persistence • All persistence.xml files found and deployed • Connection persistence.xml values filled in automatically • Servlets, ManagedBeans, Session Beans, etc now use • @PersistenceUnit EntityManagerFactory emf; • @PersistenceContext EntityManager em; • OpenJPA included, easy to remove • Hibernate used in many Apache TomEE installs 12 Monday, 31 October 11
- 13. EJBs • EJBs can be added directly to webapp • Servlets, Managed beans can use @EJB • EJB 3.1 provides no-interface view • HTTP can be used for EJB remote communication (http://localhost:8080/openejb/ejb) • User/Pass supplied with InitialContext params • HTTP or HTTPS 13 Monday, 31 October 11
- 14. What next? • How small can we get? • Below 20MB download? • 6000 classes loaded, can we get to 2000? • Optimisations • Certify more parts • Connector • JAX-WS • JAX-RS 14 Monday, 31 October 11
- 15. Testing - Embedded TomEE • Very straightforward to use, very little config needed • Maven users can add tomee-embedded dependency, or add all-in-one jar to classpath • Could be used with frameworks like HtmlUnit or Selenium to test your application Properties p = new Properties(); p.setProperty(EJBContainer.APP_NAME, "moviefun"); p.setProperty(EJBContainer.PROVIDER, "tomee-embedded"); // need web feature p.setProperty(EJBContainer.MODULES, webApp.getAbsolutePath()); p.setProperty(EmbeddedTomEEContainer.TOMEE_EJBCONTAINER_HTTP_PORT, "9999"); container = EJBContainer.createEJBContainer(p); 15 Monday, 31 October 11
- 16. Arquillian tests • Test harness from JBoss (http://www.jboss.org/ arquillian) • Allows you to run your test in any supported container • Adapters available for a number of servers • Skip the build • Run tests straight from the IDE 16 Monday, 31 October 11
- 17. TomEE Arquillian Adapters • Embedded • Boots TomEE embedded directly in the test • Remote • Can connect to a running instance of TomEE • OR download and start TomEE bundle • OR any version of Tomcat/OpenEJB • Configured in arquillian.xml 17 Monday, 31 October 11
- 18. Anatomy of an Arquillian Test • Deployment • Build an archive using the ShrinkWrap API • Choose parts of your application to test • Build archive with test settings • Test logic • Exercise your application • HtmlUnit • Selenium 18 Monday, 31 October 11
- 20. Thanks! http://openejb.apache.org [email protected] [email protected] @ApacheTomEE #TomEE Monday, 31 October 11