As of EJB 3.1, singleton beans can be notified of module start and stop: @Singleton @Startup public class StartupBean { @PostConstruct private void postConstruct() { /* … */ } @PreDestroy private void preDestroy() { /* … */ } } Prior to EJB 3.1, there is no standard, EJB-only solution. I’d suggest adding a WAR to … Read more
When we set out with the goal to Java EE 6 certify Apache Tomcat as Apache TomEE, here are some of the gaps we had to fill in order to finally pass the Java EE 6 TCK. Not a complete list, but some highlights that might not be obvious even with the existing answers. No … Read more
Is there an official correlation between Java EE / J2EE and J2SE / JDK versions? Sun may try to keep some kind of “correlation” to not confuse users and for marketing purpose but, AFAIK, no, there is no official correlation (and maintaining the pseudo synchronisation might become harder in the future as the JDK evolves … Read more
How to use a single JNDI name in your web app I’ve struggled with this for a few months myself. The best solution is to make your application portable so you have the same JNDI name in both Tomcat and Weblogic. In order to do that, you change your web.xml and spring-beans.xml to point to … Read more
@ManyToMany to self is rather confusing because the way you’d normally model this differs from the “Hibernate” way. Your problem is you’re missing another collection. Think of it this way – if you’re mapping “author”https://stackoverflow.com/”book” as many-to-many, you need “authors” collection on Book and “books” collection on Author. In this case, your “User” entity represents … Read more
For EJB and JAR packaging you should place the beans.xml in src/main/resources/META-INF/. For WAR packaging you should place the beans.xml in src/main/webapp/WEB-INF/. Remember that only .java files should be put in the src/main/java and src/test/java directories. Resources like .xml files should be in src/main/resources.
You must move persistence.xml file to an appropriate location. More specifically, add META-INF/persistence.xml file to the root of a source folder. In this case, the following is an appropriate location: src\main\java\META-INF\persistence.xml Here are the details: (taken from the JPA spec) A persistence.xml file defines a persistence unit. The persistence.xml file is located in the META-INF … Read more
Your call to methodB() is an ordinary call of a method, not intercepted by the EJB container; at run-time the EJB container will inject a proxy and not an instance of your class, this is the way it intercepts calls and setup the environment before calling your method. If you use this you’re calling a … Read more
Do not use Timer in an Java EE environment! If the task throws a runtime exception, then the whole Timer is killed and won’t run anymore. You basically needs to restart the whole server to get it to run again. Also, it is sensitive to changes in the system clock. Use ScheduledExecutorService instead. It’s not … Read more
Here are the relevant sections of the JPA 2.0 specification: 8.2 Persistence Unit Packaging … A persistence unit is defined by a persistence.xml file. The jar file or directory whose META-INF directory contains the persistence.xml file is termed the root of the persistence unit. In Java EE environments, the root of a persistence unit must … Read more