I'm trying to run embedded EJB 3.0 as an eclipse plugin, and I'm having a
problem with the EntityManager.
Here is the setup:
Plugin com.osc.core.ejb:
I created a plugin project and copied the entire lib drectory from the EJB 3.0
embedded download into the root of that project. I added every jar file to the
classpath in the runtime section of the MANIFEST.MF. I also exported every
package. I also added:
Eclipse-BuddyPolicy: registered
to the MANIFEST.MF by hand
Plugin com.osc.proto:
I created a plugin and added com.osc.core.ejb as a dependency in the
MANIFEST.MF. I copied the entire conf directory from the EJF 3.0 embedded
download into the root of that project. I added the conf directory to the
classpath in the runtime sectio of the MANIFEST.MF. I also added the buddy
registry entry and "." to the classpath by hand so that I have:
Eclipse-RegisterBuddy: com.osc.core.ejb
Bundle-classPath: conf/,
.
in the MANIFEST.MF
I created (in com.osc.proto) the following entity bean:
| package com.osc.proto;
|
| import java.io.Serializable;
|
| import javax.persistence.Basic;
| import javax.persistence.Entity;
| import javax.persistence.GeneratedValue;
| import javax.persistence.GenerationType;
| import javax.persistence.Id;
| import javax.persistence.Table;
|
| @Entity
| @Table(name="USERS")
| public class User implements Serializable
| {
| public int getId()
| {
| return id;
| }
|
| public void setId(int id)
| {
| this.id = id;
| }
|
| public String getName()
| {
| return name;
| }
|
| public void setName(String name)
| {
| this.name = name;
| }
|
| @Id
| @GeneratedValue(strategy=GenerationType.AUTO)
| private int id;
|
| @Basic
| private String name;
|
| private static final long serialVersionUID = -49617049545463116L;
| }
|
|
I created the following platform runnable extension:
|
| package com.osc.proto;
|
| import javax.persistence.EntityManager;
| import javax.persistence.PersistenceContext;
|
| import org.eclipse.core.runtime.IPlatformRunnable;
|
| public class PlatformRunnable implements IPlatformRunnable
| {
| public Object run(Object args) throws Exception
| {
| System.out.println("Starting application");
| User user = new User();
| user.setName("Bryan");
| System.out.println("Persisting user");
| manager.persist(user);
|
| System.out.println("All done");
| return null;
| }
|
| @PersistenceContext(unitName="test")
| public EntityManager manager;
| }
|
|
In the start method of the activator, I have:
|
| public void start(BundleContext context) throws Exception {
| super.start(context);
| System.out.println("Starting embedded EJB3");
| EJB3StandaloneBootstrap.boot(null);
| EJB3StandaloneBootstrap.scanClasspath();
|
| try
| {
| Persistence.createEntityManagerFactory("test");
| }
| catch (Exception e)
| {
| System.out.println(e);
| e.printStackTrace();
| }
| }
|
|
I have the following persistence.xml in the META-INF folder of that plugin:
| <persistence>
| <persistence-unit name="test">
| <jta-data-source>java:/DefaultDS</jta-data-source>
| <properties>
| <property name="hibernate.hbm2ddl.auto" value="create-drop"/>
| </properties>
| </persistence-unit>
| </persistence>
|
When I run the platform runnable, I get the following exception when the
activator starts and attempts to create the entity manager factory:
Starting embedded EJB3
WARN 25-02 10:03:38,190 (BeanSchemaBinding.java:init:227) -You should use the
2.0 version of the Microcontainer xml. xmlns='urn:jboss:bean-deployer:2.0'
FATAL 25-02 10:03:40,368 (PersistenceXmlLoader.java:parsePersistenceUnit:101)
-test JTA
javax.persistence.PersistenceException: java.lang.NullPointerException
javax.persistence.PersistenceException: java.lang.NullPointerException
at
org.hibernate.ejb.Ejb3Configuration.createEntityManagerFactory(Ejb3Configuration.java:173)
at
org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:103)
at
javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:37)
at
javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:27)
at com.osc.proto.Activator.start(Activator.java:36)
at
org.eclipse.osgi.framework.internal.core.BundleContextImpl$2.run(BundleContextImpl.java:994)
at java.security.AccessController.doPrivileged(Native Method)
at
org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:988)
at
org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:969)
at
org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:314)
at
org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:256)
at
org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.preFindLocalClass(EclipseLazyStarter.java:83)
at
org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:402)
at
org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:186)
at
org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass(BundleLoader.java:338)
at
org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:390)
at
org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:351)
at
org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:81)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at
org.eclipse.osgi.framework.internal.core.BundleLoader.loadClass(BundleLoader.java:276)
at
org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:227)
at
org.eclipse.osgi.framework.internal.core.AbstractBundle.loadClass(AbstractBundle.java:1245)
at
org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:138)
at
org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:759)
at
org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243)
at
org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:51)
at
org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:95)
at
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:92)
at
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:68)
at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:374)
at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:169)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.eclipse.core.launcher.Main.invokeFramework(Main.java:338)
at org.eclipse.core.launcher.Main.basicRun(Main.java:282)
at org.eclipse.core.launcher.Main.run(Main.java:977)
at org.eclipse.core.launcher.Main.main(Main.java:952)
Caused by: java.lang.NullPointerException
at
org.hibernate.ejb.packaging.PersistenceXmlLoader.deploy(PersistenceXmlLoader.java:68)
at
org.hibernate.ejb.Ejb3Configuration.createEntityManagerFactory(Ejb3Configuration.java:139)
... 38 more
I tried following the simple tutorial bundled with the EJB 3.0 embedded
download, and not create an entity manager factory, but when I tried to persist
my entity bean with the EntityManager, I got a null pointer exception when
calling manager.persist(user).
I poked around and found a section in the hibernate docs that says you have to
call createEntityManagerFactory() to bootstrap the entity manager. I added
that call and that's where I get an exception.
1. When using the EJB 3.0 embedded code, do I really have to call
createEntitymanagerFactory()? Why doesn't the tutorial code do this?
2. Why am I getting an exception when I call createEntityManagerFactory()?
Bryan
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