JBoss 4.0 Dynamic runtime loading (Class.forName) problem

[michaelf]

Hi!!
I am trying to use the following simple reflection code in the business logic layer:

Class toRun = Class.forName("Simple");

Unfortunately, I have the following exception:

java.lang.ClassNotFoundException: No ClassLoaders found for: Simple
 at org.jboss.mx.loading.LoadMgr3.beginLoadTask(LoadMgr3.java:292)
 at org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:463)
 at org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:374)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
 at org.jboss.util.loading.DelegatingClassLoader.loadClass(DelegatingClassLoader.java:77)
 at org.jboss.mx.loading.LoaderRepositoryClassLoader.loadClass(LoaderRepositoryClassLoader.java:78)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
 at org.jboss.util.loading.DelegatingClassLoader.loadClass(DelegatingClassLoader.java:77)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
 at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
 at java.lang.Class.forName0(Native Method)
 at java.lang.Class.forName(Class.java:219)
 ...

The following code throws the same exception:

Thread t = Thread.currentThread();
ClassLoader cl = t.getContextClassLoader();
Class toRun = cl.loadClass("Simple");

I found the topic on the issue, but it deals with JBoss 3.2.3 and the presentation layer:

http://www.jboss.org/index.html?module=bb&op=viewtopic&t=45602

Please help!
Best regards,
Michael

[darranl]

How is your application packaged? Where is the class 'Simple' located?

[michaelf]

Hi!
I have one EAR.
This EAR contains the stateless session bean and the Simple class.
I am trying to create Simple from the stateless session bean
How should I package the files?

Best regards,
Michael

[darranl]

You say the ear contains the session bean,

Do you mean the session bean is packaged within a jar file, the jar itself is then packaged in the ear? Is the class 'Simple' in the same archive as the session bean or is it in the ear or another archive?

[michaelf]

Yes, the session bean is packaged within a jar file, the jar itself is then packaged in the ear.
The class 'Simple' is in the same archive as the session bean.

Best regards,
Michael

[darranl]

Is your class 'Simple' actually in the default package or is it contained within a package? Does the structure of your jar file reflect all package names correctly?

Does your class 'Simple' reference any other classes? If so are the classes also available?

FYI - I am working with JBoss 4.0 using both the Class.forName approach and the getContextClassLoader approach without any issues so I think your problem must relate to a minor packaging issue.

[michaelf]

THANK YOU VERY MUCH!
The problem was the packaging!!!

Best regards,
Michael