WSO2 ESB: JAR file with callback handler not loading - wso2

Question

I am trying to setup a proxy service that hides the security of a back end service, following the tutorial found here.
For the password callback handler I follow the instructions found here.
All pretty basic and straightforward.
I compiled the PWCBHandler class into a JAR file and put it in the esbhome\repository\components\lib folder together with all the JAR files from wss4j-1.6.15\lib.
I see no warnings or errors during startup of the ESB. However when I test the proxy service, I get the following error in the log:
org.apache.axis2.AxisFault: Error in obtaining a token
at org.apache.rampart.handler.RampartSender.invoke(RampartSender.java:76)
at org.apache.axis2.engine.Phase.invokeHandler(Phase.java:340)
...
Caused by: org.apache.rampart.RampartException: Error in obtaining a token
at org.apache.rampart.util.RampartUtil.getToken(RampartUtil.java:779)
at org.apache.rampart.util.RampartUtil.getIssuedToken(RampartUtil.java:675)
...
Caused by: org.apache.rampart.RampartException: Cannot load password callback class: PWCBHandler
at org.apache.rampart.util.RampartUtil.getPasswordCB(RampartUtil.java:144)
at org.apache.rampart.util.RampartUtil.getPasswordCB(RampartUtil.java:118)
at org.apache.rampart.util.RampartUtil.getToken(RampartUtil.java:723)
...
... 26 more
Caused by: java.lang.ClassNotFoundException: PWCBHandler
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:501)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:421)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:412)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
... 26 more
Caused by: java.lang.ClassNotFoundException: PWCBHandler
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:501)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:421)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:412)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:190)
at org.apache.ws.security.util.Loader.loadClass(Loader.java:200)
at org.apache.ws.security.util.Loader.loadClass(Loader.java:163)
at org.apache.rampart.util.RampartUtil.getPasswordCB(RampartUtil.java:142)
... 28 more
[2014-06-16 15:56:23,103] WARN - FaultHandler ERROR_CODE : 0
[2014-06-16 15:56:23,103] WARN - FaultHandler ERROR_MESSAGE : Unexpected error during sending message out
[2014-06-16 15:56:23,103] WARN - FaultHandler ERROR_DETAIL : org.apache.synapse.SynapseException: Unexpected error during sending message out
at org.apache.synapse.core.axis2.Axis2Sender.handleException(Axis2Sender.java:170)
at org.apache.synapse.core.axis2.Axis2Sender.sendOn(Axis2Sender.java:69)
...
In other words, the ESB and Rampart know about the PWCBHandler class but it cannot load / access it.
At this point I have no ideas where to look further. Is there a way where I can check which JAR files were loaded during startup? What might prohibit the loading of the PWCBHandler JAR?
Thanks for your feedback,
Olivier

Answer 1

Thanks to the answer from Rajeev I got confirmation the class was not loading.
I recreated the JAR file with the class added to a package and after restarting the server a bundle for the JAR was created.
It looks like custom classes need to be added to a package for Carbon to create a bundle from it.
I know, I know, classes should always be added to a package, but I am not a Java hero and did not want to bother with the dirs and such.
Lessons learned! :)