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Error 500: class loading constraint violated

Serghei Mazurean

Joined: Jul 14, 2009
Posts: 10
Hallo all!

PLEASE HELP!!! I have no solution for this Problem...

I have successfully deployed a RAP application with the Derby Data Base on JBOSS
Now I'm trying to deploy the same application using Websphere 6.1. I have set a Datasource and the connection test was successful.

I have reach a OSGi console in telnet and all my bundles are active. When I try to load my application in browser, I receive the following Error:

Error 500: class loading constraint violated (class: org/apache/derby/client/am/ResultSet method: completeSqlca

In SystemOut.log i found more info:

[7/16/09 14:50:49:265 CEST] 0000034e WebApp A SRVE0181I: [finca_osgi_1200_war#finca_osgi_1200.war] [/finca_osgi_1200] [Servlet.LOG]: Could not execute org.eclipse.ui.internal.Workbench$ShutdownHandler.beforeDestroy(SessionStoreEvent).: java.lang.RuntimeException: Could not create the session singleton instance of 'org.eclipse.jface.resource.JFaceResources$ImageRegistryStore' because an Exception was thrown by the constructor:
at org.eclipse.rwt.SessionSingletonBase.getInstanceInternal(SessionSingletonBase.java:189)
at org.eclipse.rwt.SessionSingletonBase.getInstance(SessionSingletonBase.java:91)
at org.eclipse.jface.resource.JFaceResources$ImageRegistryStore.getInstance(JFaceResources.java:180)
at org.eclipse.jface.resource.JFaceResources.getImageRegistry(JFaceResources.java:582)
at org.eclipse.ui.internal.progress.ProgressInfoItem.init(ProgressInfoItem.java:126)
at org.eclipse.ui.internal.progress.ProgressManager$ProgressManagerProvider.getInstance(ProgressManager.java:73)
at org.eclipse.ui.internal.progress.ProgressManager.getInstance(ProgressManager.java:151)
at org.eclipse.ui.internal.progress.ProgressManager.shutdownProgressManager(ProgressManager.java:163)
at org.eclipse.ui.internal.WorkbenchPlugin.reset(WorkbenchPlugin.java:342)
at org.eclipse.ui.internal.Workbench.shutdown(Workbench.java:2851)
at org.eclipse.ui.internal.Workbench.busyClose(Workbench.java:959)
at org.eclipse.ui.internal.Workbench.access$12(Workbench.java:870)
at org.eclipse.ui.internal.Workbench$21.run(Workbench.java:1136)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:66)
at org.eclipse.ui.internal.Workbench.close(Workbench.java:1134)
at org.eclipse.ui.internal.Workbench.close(Workbench.java:1096)
at org.eclipse.ui.internal.Workbench$ShutdownHandler.beforeDestroy(Workbench.java:219)
at org.eclipse.rwt.internal.service.SessionStoreImpl.doValueUnbound(SessionStoreImpl.java:174)
at org.eclipse.rwt.internal.service.SessionStoreImpl.valueUnbound(SessionStoreImpl.java:152)
at org.eclipse.rwt.internal.service.LifeCycleServiceHandler.clearSession(LifeCycleServiceHandler.java:251)
at org.eclipse.rwt.internal.service.LifeCycleServiceHandler.checkRequest(LifeCycleServiceHandler.java:230)
at org.eclipse.rwt.internal.service.LifeCycleServiceHandler.internalService(LifeCycleServiceHandler.java:188)
at org.eclipse.rwt.internal.service.LifeCycleServiceHandler.access$1(LifeCycleServiceHandler.java:185)
at org.eclipse.rwt.internal.service.LifeCycleServiceHandler$LifeCycleServiceHandlerSync.doService(LifeCycleServiceHandler.java:150)
at org.eclipse.rwt.internal.lifecycle.RWTLifeCycleServiceHandlerSync.serviceInternal(RWTLifeCycleServiceHandlerSync.java:48)
at org.eclipse.rwt.internal.lifecycle.RWTLifeCycleServiceHandlerSync.service(RWTLifeCycleServiceHandlerSync.java:36)
at org.eclipse.rwt.internal.service.LifeCycleServiceHandler.service(LifeCycleServiceHandler.java:157)
at org.eclipse.rwt.internal.service.ServiceManager$HandlerDispatcher.service(ServiceManager.java:101)
at org.eclipse.rwt.internal.engine.RWTDelegate.doPost(RWTDelegate.java:63)
at org.eclipse.rap.ui.internal.servlet.RequestHandler.service(RequestHandler.java:51)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at org.eclipse.equinox.http.servlet.internal.ServletRegistration.handleRequest(ServletRegistration.java:90)
at org.eclipse.equinox.http.servlet.internal.ProxyServlet.processAlias(ProxyServlet.java:111)
at org.eclipse.equinox.http.servlet.internal.ProxyServlet.service(ProxyServlet.java:59)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at org.eclipse.equinox.servletbridge.BridgeServlet.service(BridgeServlet.java:120)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:966)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:478)
at com.ibm.ws.wswebcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:463)
at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:92)
at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:744)
at com.ibm.ws.wswebcontainer.WebContainer.handleRequest(WebContainer.java:1425)
at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:92)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:465)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:394)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:274)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113)
at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:152)
at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:213)
at com.ibm.io.async.AbstractAsyncFuture.fireCompletionActions(AbstractAsyncFuture.java:195)
at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:136)
at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:193)
at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:725)
at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:847)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1498)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:67)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:521)
at org.eclipse.rwt.SessionSingletonBase.getInstanceInternal(SessionSingletonBase.java:154)
... 56 more
Caused by: java.lang.ExceptionInInitializerError
at java.lang.J9VMInternals.initialize(J9VMInternals.java:195)
at java.lang.Class.forNameImpl(Native Method)
at java.lang.Class.forName(Class.java:131)
at org.eclipse.jface.resource.JFaceResources$ImageRegistryStore.initializeDefaultImages(JFaceResources.java:220)
at org.eclipse.jface.resource.JFaceResources$ImageRegistryStore.<init>(JFaceResources.java:176)
... 61 more
Caused by: org.eclipse.core.runtime.AssertionFailedException: null argument:
at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:85)
at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:73)
at org.eclipse.jface.resource.FontRegistry.<init>(FontRegistry.java:285)
at org.eclipse.jface.resource.FontRegistry.<init>(FontRegi

Please Help!!!

with respect,
Cameron Wallace McKenzie
author and cow tipper
Saloon Keeper

Joined: Aug 26, 2006
Posts: 4968

It sounds to me like a classloading issue during JDBC, probably connection pooling.

Here's an interesting link on the subject:

Classloader Constraint Exception with WebSphere and Rational

Can you get this in the dev environment? Maybe stepping through the code in IRAD might shed some light.

What type of connection pool are you using? Where are the JDBC drivers stored on your classpath - in the war? On the shared lib? WebSphere classpath?

I did a little tutorial on classloaders in WebSphere that talks about all the different places you can put shared libraries to avoid classloader problems. You might find it helpful:

Classloaders and WebSphere Classpath Locations

These are really just ideas and hunches. Post back with any ideas or more information you might have and we'll try and put more hands on the problem.

-Cameron McKenzie

Serghei Mazurean

Joined: Jul 14, 2009
Posts: 10
Hello Cameron,

Thank you very much! It has helped! They were "jdbc Drivers" in my .war
But now I have the follow-Error of taking off the jdbc Drivers. My Application uses that drivers to connect with my Derby DB

I have set in web.xml the "org.apache.derby.jdbc" as a parameter:

But it doesn't helped me
So, I have the problem, that if I take "jdbc driver" off from .war, then I have the Exception, that my application can not connect to the Derby DB:
java.lang.Exception Description
And if i live the jdbc-drivers in my .war, then I haven't this error, but then I have the "Error 500: class loading constraint violated" ((

What should I do i this case? ((
Paul Clapham

Joined: Oct 14, 2005
Posts: 19891

In Websphere, when you create a data source, you have to do this:

(1) Put the JDBC driver jar somewhere which ISN'T in your application. Create a new directory for it.

(2) Specify that location (directory plus jar file name) in the admin application, in the field which asks for classpath in the data source configuration.

I'm not looking at the admin application as I type this and I don't remember the exact field name.
Serghei Mazurean

Joined: Jul 14, 2009
Posts: 10
Hello Paul,

Thank you very much, for your answer. I have tried what you wrote:

1. I create one Folder(f:/ibm//shlib) and have copied the drivers there.
2. Then I have indicate this directory as shared in Websphere.
3. I have referenced it to Application Server: Servers-> Application Servers -> "applicationserver1" -> Java and Process Managment -> Class loader -> New -> OK -> select the new classloader ->Shared library

But id doesn't help. I still have this Exception: Unable to acquire a connection from driver [null], user [null] and URL [null]. Verify that you have set the expected driver class and URL. Check your login,
persistence.xml or sessions.xml resource. The jdbc.driver property should be set to a class that is compatible with your database platform

Maybe, my shared libraries classpath is wrong?! but it seems to be alright.
Here is my classpath(in Shared libraries)

Please HELP ME!!! I shoul work, it is a small thing, that is wrong, but I can not solve it

Thanks a lot!

with respect,

Paul Clapham

Joined: Oct 14, 2005
Posts: 19891

Serghei Mazurean wrote:Hello Paul,

Thank you very much, for your answer. I have tried what you wrote:

Actually you didn't.

When you create a JDBC provider in Websphere (in 6.1, at least) it explicitly prompts you to specify either the directory where the jar files are located or the path to the jar file itself. As far as I know that's all you need to do. I haven't ever done what you just tried.
Serghei Mazurean

Joined: Jul 14, 2009
Posts: 10
Hello Paul,

Thanks a lot that you try to help me!!! I appreciate it much.

The solution with shared library I found in another Forum. As I wrote it hasn't helped me.
This time I have tried in the way you write:
I have set the JDBC Provider and have specified the Class path "F:/IBM2/shlib", where I have copied my derby.jar and derbyclient.jar
But I receive now an Exception(that ClientDriver was not found ):
[7/23/09 15:51:43:250 CEST] 00000953 SystemOut O Exception caught: Exception [EclipseLink-4003] (Eclipse Persistence Services - 1.0.2 (Build 20081024)): org.eclipse.persistence.exceptions.DatabaseException
Exception Description: Configuration error. Class [org.apache.derby.jdbc.ClientDriver] not found.

May be I have set wrong class path(F:/IBM2/shlib)? I have tried also with Websphere Variable(DERBY_JDBC_DRIVER_PATH= ${WAS_INSTALL_ROOT}/shlib ), where ${WAS_INSTALL_ROOT}= "F:/IBM2"
but also without success (


Thanks a lot!!!

with respect,
Paul Clapham

Joined: Oct 14, 2005
Posts: 19891

Usually when you specify a classpath, you provide a list of directories where classes can be found and a list of jar files where classes can be found. You don't seem to have included any jar files in your classpath.
Serghei Mazurean

Joined: Jul 14, 2009
Posts: 10
Paul Clapham wrote:You don't seem to have included any jar files in your classpath.

Hello Paul,

Thanks a lot for your Help!

I have tried also with list of "jars" on Thursday, but it seems to be something wrong in my classpath. I have entered

with WebSphere Variables, which theoretically is the same thing :


In both Variants it is the same Exception Description: Configuration error. Class [org.apache.derby.jdbc.ClientDriver] not found.

What is wrong in my classpath? :(
Please HELP!!! :banghead:
Paul Clapham

Joined: Oct 14, 2005
Posts: 19891

What's this F: drive? You must have a rather unusual hardware configuration -- most Windows boxes have only one or two hard drive letters, C and maybe D.
I agree. Here's the link: http://aspose.com/file-tools
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