title: loading constraint violation in Websphere
body: <p>We are building a webapp with Websphere 7 as target environment, it connects to webservices using CXF. We have done our tests locally using Jetty and everything went fine. We are now trying to deploy the application in Websphere and I get anLinkageError that I really don't understand the meaning of this error ...</p>
  
  <pre><code>    [11/01/12 10:25:45:716 CET] 00000013 webapp        E com.ibm.ws.webcontainer.webapp.WebApp logError SRVE0293E: [Servlet Error]-[loading constraint violation: loader "com/ibm/ws/classloader/CompoundClassLoader@fb40fb4" previously initiated loading for a different type with name "javax/xml/bind/JAXBContext" defined by loader "com/ibm/oti/vm/BootstrapClassLoader@6ba26ba2"]: java.lang.LinkageError: loading constraint violation: loader "com/ibm/ws/classloader/CompoundClassLoader@fb40fb4" previously initiated loading for a different type with name "javax/xml/bind/JAXBContext" defined by loader "com/ibm/oti/vm/BootstrapClassLoader@6ba26ba2"
  at java.lang.ClassLoader.defineClassImpl(Native Method)
  at java.lang.ClassLoader.defineClass(ClassLoader.java:275)
  at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:69)
  at com.ibm.ws.classloader.CompoundClassLoader._defineClass(CompoundClassLoader.java:773)
  at com.ibm.ws.classloader.CompoundClassLoader.localFindClass(CompoundClassLoader.java:688)
  at com.ibm.ws.classloader.CompoundClassLoader.loadClass(CompoundClassLoader.java:529)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:626)
  at java.lang.J9VMInternals.verifyImpl(Native Method)
  at java.lang.J9VMInternals.verify(J9VMInternals.java:72)
  at java.lang.J9VMInternals.initialize(J9VMInternals.java:134)
  at org.apache.cxf.service.factory.ReflectionServiceFactoryBean.createDefaultDataBinding(ReflectionServiceFactoryBean.java:214)
  at org.apache.cxf.service.factory.AbstractServiceFactoryBean.getDataBinding(AbstractServiceFactoryBean.java:109)
  at org.apache.cxf.service.factory.AbstractServiceFactoryBean.getDataBinding(AbstractServiceFactoryBean.java:105)
  at org.apache.cxf.jaxws.support.JaxWsServiceFactoryBean.generatedWrapperBeanClass(JaxWsServiceFactoryBean.java:654)
  at org.apache.cxf.jaxws.support.JaxWsServiceFactoryBean.getExtraClass(JaxWsServiceFactoryBean.java:630)
  at org.apache.cxf.service.factory.ReflectionServiceFactoryBean.buildServiceFromWSDL(ReflectionServiceFactoryBean.java:394)
  at org.apache.cxf.service.factory.ReflectionServiceFactoryBean.initializeServiceModel(ReflectionServiceFactoryBean.java:505)
  at org.apache.cxf.service.factory.ReflectionServiceFactoryBean.create(ReflectionServiceFactoryBean.java:241)
  at org.apache.cxf.jaxws.support.JaxWsServiceFactoryBean.create(JaxWsServiceFactoryBean.java:202)
  at org.apache.cxf.frontend.AbstractWSDLBasedEndpointFactory.createEndpoint(AbstractWSDLBasedEndpointFactory.java:101)
  at org.apache.cxf.frontend.ClientFactoryBean.create(ClientFactoryBean.java:90)
  at org.apache.cxf.frontend.ClientProxyFactoryBean.create(ClientProxyFactoryBean.java:153)
  at org.apache.cxf.jaxws.JaxWsProxyFactoryBean.create(JaxWsProxyFactoryBean.java:151)
  at org.apache.cxf.jaxws.ServiceImpl.createPort(ServiceImpl.java:465)
  at org.apache.cxf.jaxws.ServiceImpl.getPort(ServiceImpl.java:332)
  at org.apache.cxf.jaxws.ServiceImpl.getPort(ServiceImpl.java:319)
  at javax.xml.ws.Service.getPort(Service.java:103)
  at org.springframework.remoting.jaxws.JaxWsPortClientInterceptor.getPortStub(JaxWsPortClientInterceptor.java:413)
  at org.springframework.remoting.jaxws.JaxWsPortClientInterceptor.prepare(JaxWsPortClientInterceptor.java:337)
  at org.springframework.remoting.jaxws.JaxWsPortClientInterceptor.invoke(JaxWsPortClientInterceptor.java:478)
  at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
  at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
  at $Proxy365.logAccessToApplicationForUser(Unknown Source)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
  at java.lang.reflect.Method.invoke(Method.java:611)
  at org.apache.wicket.proxy.LazyInitProxyFactory$JdkHandler.invoke(LazyInitProxyFactory.java:416)
  at org.apache.wicket.proxy.$Proxy397.logAccessToApplicationForUser(Unknown Source)
  at com.bnpp.ecom.emm.EMMHomePage.onInitialize(EMMHomePage.java:52)
  at org.apache.wicket.Component.fireInitialize(Component.java:920)
  at org.apache.wicket.MarkupContainer.internalInitialize(MarkupContainer.java:1002)
  at org.apache.wicket.Page.internalPrepareForRender(Page.java:278)
  at org.apache.wicket.Component.render(Component.java:2271)
  at org.apache.wicket.Page.renderPage(Page.java:1035)
  at org.apache.wicket.request.handler.render.WebPageRenderer.renderPage(WebPageRenderer.java:105)
  at org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:224)
  at org.apache.wicket.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:167)
  at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:750)
  at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
  at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:252)
  at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:209)
  at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:280)
  at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:162)
  at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:218)
  at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:188)
  at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:116)
  at com.ibm.ws.webcontainer.filter.WebAppFilterChain._doFilter(WebAppFilterChain.java:77)
  at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:908)
  at com.ibm.ws.webcontainer.filter.WebAppFilterManager.invokeFilters(WebAppFilterManager.java:997)
  at com.ibm.ws.webcontainer.extension.DefaultExtensionProcessor.invokeFilters(DefaultExtensionProcessor.java:1062)
  at com.ibm.ws.webcontainer.extension.DefaultExtensionProcessor.handleRequest(DefaultExtensionProcessor.java:759)
  at com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:3935)
  at com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:276)
  at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:931)
  at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1583)
  at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:186)
  at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:452)
  at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:511)
  at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:305)
  at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:276)
  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:165)
  at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
  at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
  at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138)
  at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204)
  at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775)
  at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905)
  at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1604)
  </code></pre>
  
  <p>Does this mean anything to one of you ?</p>
  
  <p>Many thanks in advance</p>