No ClassLoaders found when deploying on Windows

[mikebgx]

Hi Folks,

I'm getting a strange problem when I deploy my app on Windows (XP or 2k3)

Here's the server.log output when it deploys successfully on Mac or Linux:

15:22:33,664 INFO  [EARDeployer] Init J2EE application: file:/usr/local/jboss-4.2.2.GA/server/default/deploy/gar01.ear
15:22:35,484 INFO  [JmxKernelAbstraction] creating wrapper delegate for: org.jboss.ejb3.entity.PersistenceUnitDeployment
15:22:35,485 INFO  [JmxKernelAbstraction] installing MBean: persistence.units:ear=gar01.ear,unitName=gar01 with dependencies:
15:22:35,485 INFO  [JmxKernelAbstraction]      jboss.jca:name=gar01Datasource,service=DataSourceBinding
15:22:35,486 INFO  [PersistenceUnitDeployment] Starting persistence unit persistence.units:ear=gar01.ear,unitName=gar01
15:22:35,488 INFO  [Ejb3Configuration] Processing PersistenceUnitInfo [
     name: gar01
     ...]
15:22:35,504 INFO  [Ejb3Configuration] found EJB3 Entity bean: ws.myco.gar.Client
15:22:35,605 INFO  [Configuration] Reading mappings from resource : META-INF/orm.xml
15:22:35,605 INFO  [Ejb3Configuration] [PersistenceUnit: gar01] no META-INF/orm.xml found
15:22:35,607 INFO  [AnnotationBinder] Binding entity from annotated class: ws.myco.gar.Client
15:22:35,607 INFO  [EntityBinder] Bind entity ws.myco.gar.Client on table Client

But when I try to deploy it on Windows the log output is like this:
2010-03-18 15:16:41,755 INFO  [org.jboss.deployment.EARDeployer] Init J2EE application: file:/C:/Program Files/jboss-4.2.2.GA/server/default/deploy/gar01.ear
2010-03-18 15:16:53,724 INFO  [org.jboss.ejb3.JmxKernelAbstraction] creating wrapper delegate for: org.jboss.ejb3.entity.PersistenceUnitDeployment
2010-03-18 15:16:53,724 INFO  [org.jboss.ejb3.JmxKernelAbstraction] installing MBean: persistence.units:ear=gar01.ear,unitName=gar01 with dependencies:
2010-03-18 15:16:53,724 INFO  [org.jboss.ejb3.JmxKernelAbstraction]      jboss.jca:name=gar01Datasource,service=DataSourceBinding
2010-03-18 15:16:53,724 INFO  [org.jboss.ejb3.entity.PersistenceUnitDeployment] Starting persistence unit persistence.units:ear=gar01.ear,unitName=gar01
2010-03-18 15:16:53,740 INFO  [org.hibernate.ejb.Ejb3Configuration] Processing PersistenceUnitInfo [
     name: gar01
     ...]
2010-03-18 15:16:53,740 INFO  [org.hibernate.ejb.Ejb3Configuration] found EJB3 Entity bean: ws.myco.gar.Client
2010-03-18 15:16:53,849 WARN  [org.jboss.system.ServiceController] Problem starting service persistence.units:ear=gar01.ear,unitName=gar01
javax.persistence.PersistenceException: [PersistenceUnit: gar01] class or package not found
     at org.hibernate.ejb.Ejb3Configuration.addNamedAnnotatedClasses(Ejb3Configuration.java:1089)
     at org.hibernate.ejb.Ejb3Configuration.addClassesToSessionFactory(Ejb3Configuration.java:886)
     at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:772)
     at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:407)
     at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:126)
     at org.jboss.ejb3.entity.PersistenceUnitDeployment.start(PersistenceUnitDeployment.java:246)
.......
Caused by: java.lang.ClassNotFoundException: No ClassLoaders found for: ws.myco.gar.Client
     at org.jboss.mx.loading.LoadMgr3.beginLoadTask(LoadMgr3.java:212)
     at org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:521)
     at org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:415)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
     at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
     at java.lang.Class.forName0(Native Method)
     at java.lang.Class.forName(Class.java:242)
     at org.hibernate.util.ReflectHelper.classForName(ReflectHelper.java:112)
     at org.hibernate.ejb.Ejb3Configuration.classForName(Ejb3Configuration.java:1005)
     at org.hibernate.ejb.Ejb3Configuration.addNamedAnnotatedClasses(Ejb3Configuration.java:1077)
     ... 104 more

Then later when I run the app it fails because the session bean it accesses is null.

Curiously, older versions of the app deploy OK on both platforms, I can't see what I've changed that would cause this problem.

Any ideas please?

Best Regards

Mike Burton

[swd847]

It could possibly occur due to the case insensitive file names on windows, however normally this would manifest the other way around, so I am not really sure.

You could possibly try upgrading to 4.2.3.GA as well, and I would also try putting jboss on a path without a space in it.

[mikebgx]

Thanks Stuart,

Removing spaces in path made no difference.

I've a hunch its something to do with security / permissions of classloaders, has anyone had problems like this?

[mikebgx]

Turned out to be a JDK-version issue.
When I looked in boot.log it showed it JBoss was running under JDK5 whereas I'd built the app with JDK6.

Shame  it wasn't obvious from the error message, will watch for this one in future.

[a.moreno.jimenez]

6 years later and this last comment is still fresh and useful. Thanks Mike! This saved my day.