While trying to consume a soap webservice in Mx4.8.8 I am getting the following below. Anybody a guess how to debug NoClassDefFoundErrors? Regards, Ronald Error in execution of monitored action 'executeaction' (execution id: 1f72c961fc16880, execution type: CLIENT -------- java.lang.NoClassDefFoundError: javax/xml/ws/soap/AddressingFeature$Responses at com.sun.xml.ws.addressing.policy.AddressingFeatureConfigurator.getFeatures(AddressingFeatureConfigurator.java:130) at com.sun.xml.ws.policy.jaxws.PolicyUtil.getPortScopedFeatures(PolicyUtil.java:139) at com.sun.xml.ws.policy.jaxws.PolicyUtil.configureModel(PolicyUtil.java:114) at com.sun.xml.ws.policy.jaxws.PolicyWSDLParserExtension.postFinished(PolicyWSDLParserExtension.java:969) at com.sun.xml.ws.wsdl.parser.DelegatingParserExtension.postFinished(DelegatingParserExtension.java:191) at com.sun.xml.ws.wsdl.parser.WSDLParserExtensionFacade.postFinished(WSDLParserExtensionFacade.java:338) at com.sun.xml.ws.wsdl.parser.RuntimeWSDLParser.parse(RuntimeWSDLParser.java:175) at com.sun.xml.ws.wsdl.parser.RuntimeWSDLParser.parse(RuntimeWSDLParser.java:135) at com.sun.xml.ws.client.WSServiceDelegate.parseWSDL(WSServiceDelegate.java:275) at com.sun.xml.ws.client.WSServiceDelegate.<init>(WSServiceDelegate.java:238) at com.sun.xml.ws.client.WSServiceDelegate.<init>(WSServiceDelegate.java:186) at com.sun.xml.ws.spi.ProviderImpl.createServiceDelegate(ProviderImpl.java:111) at javax.xml.ws.Service.<init>(Service.java:56) at javax.xml.ws.Service.create(Service.java:680) at nP$1.a(SourceFile:60) at nP$1.run(SourceFile:53) at java.security.AccessController.doPrivileged(Native Method) at nP.d(SourceFile:46) at nT$2.a(SourceFile:313) at nT$2.run(SourceFile:300) at java.security.AccessController.doPrivileged(Native Method) at nT.a(SourceFile:289) at nT.a(SourceFile:140) at com.mendix.modules.webservices.WebserviceModule.callWebservice(SourceFile:231) at lN.a(SourceFile:70) at mP.a(SourceFile:77) at mO.a(SourceFile:163) at mO.executeAction(SourceFile:100) at com.mendix.systemwideinterfaces.core.UserAction.execute(SourceFile:57) at com.mendix.core.actionmanagement.CoreAction.a(SourceFile:478) at com.mendix.core.actionmanagement.CoreAction.call(SourceFile:463) at hJ.b(SourceFile:198) at com.mendix.core.Core.execute(SourceFile:226) at gp.execute(SourceFile:186) at jv$b.apply$mcV$sp(SourceFile:364) at jv$b.apply(SourceFile:356) at jv$b.apply(SourceFile:356) at com.mendix.externalinterface.connector.RequestDispatching$Worker$a.a(SourceFile:185) at com.mendix.externalinterface.connector.RequestDispatching$Worker$a.apply(SourceFile:179) at akka.actor.Actor$class.apply(Actor.scala:545) at com.mendix.externalinterface.connector.RequestDispatching$Worker.apply(SourceFile:175) at akka.actor.LocalActorRef.invoke(ActorRef.scala:910) at akka.dispatch.MessageInvocation.invoke(MessageHandling.scala:25) at akka.dispatch.ExecutableMailbox$class.processMailbox(ExecutorBasedEventDrivenDispatcher.scala:223) at akka.dispatch.ExecutorBasedEventDrivenDispatcher$$anon$4.processMailbox(ExecutorBasedEventDrivenDispatcher.scala:123) at akka.dispatch.ExecutableMailbox$class.run(ExecutorBasedEventDrivenDispatcher.scala:195) at akka.dispatch.ExecutorBasedEventDrivenDispatcher$$anon$4.run(ExecutorBasedEventDrivenDispatcher.scala:123) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) at java.lang.Thread.run(Thread.java:662) at akka.dispatch.MonitorableThread.run(ThreadPoolBuilder.scala:192) Caused by: java.lang.ClassNotFoundException: javax.xml.ws.soap.AddressingFeature$Responses at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) at com.sun.xml.ws.addressing.policy.AddressingFeatureConfigurator.getFeatures(AddressingFeatureConfigurator.java:130) at com.sun.xml.ws.policy.jaxws.PolicyUtil.getPortScopedFeatures(PolicyUtil.java:139) at com.sun.xml.ws.policy.jaxws.PolicyUtil.configureModel(PolicyUtil.java:114) at com.sun.xml.ws.policy.jaxws.PolicyWSDLParserExtension.postFinished(PolicyWSDLParserExtension.java:969) at com.sun.xml.ws.wsdl.parser.DelegatingParserExtension.postFinished(DelegatingParserExtension.java:191) at com.sun.xml.ws.wsdl.parser.WSDLParserExtensionFacade.postFinished(WSDLParserExtensionFacade.java:338) at com.sun.xml.ws.wsdl.parser.RuntimeWSDLParser.parse(RuntimeWSDLParser.java:175) at com.sun.xml.ws.wsdl.parser.RuntimeWSDLParser.parse(RuntimeWSDLParser.java:135) at com.sun.xml.ws.client.WSServiceDelegate.parseWSDL(WSServiceDelegate.java:275) at com.sun.xml.ws.client.WSServiceDelegate.<init>(WSServiceDelegate.java:238) at com.sun.xml.ws.client.WSServiceDelegate.<init>(WSServiceDelegate.java:186) at com.sun.xml.ws.spi.ProviderImpl.createServiceDelegate(ProviderImpl.java:111) at javax.xml.ws.Service.<init>(Service.java:56) at javax.xml.ws.Service.create(Service.java:680) at nP$1.a(SourceFile:60) at nP$1.run(SourceFile:53) at java.security.AccessController.doPrivileged(Native Method) at nP.d(SourceFile:46) at nT$2.a(SourceFile:313) at nT$2.run(SourceFile:300) at java.security.AccessController.doPrivileged(Native Method) at nT.a(SourceFile:289) at nT.a(SourceFile:140) at com.mendix.modules.webservices.WebserviceModule.callWebservice(SourceFile:231) at lN.a(SourceFile:70) at mP.a(SourceFile:77) at mO.a(SourceFile:163) at mO.executeAction(SourceFile:100) at com.mendix.systemwideinterfaces.core.UserAction.execute(SourceFile:57) at com.mendix.core.actionmanagement.CoreAction.a(SourceFile:478) at com.mendix.core.actionmanagement.CoreAction.call(SourceFile:463) at hJ.b(SourceFile:198) at com.mendix.core.Core.execute(SourceFile:226) at gp.execute(SourceFile:186) at jv$b.apply$mcV$sp(SourceFile:364) at jv$b.apply(SourceFile:356) at jv$b.apply(SourceFile:356) at com.mendix.externalinterface.connector.RequestDispatching$Worker$a.a(SourceFile:185) at com.mendix.externalinterface.connector.RequestDispatching$Worker$a.apply(SourceFile:179) at akka.actor.Actor$class.apply(Actor.scala:545) at com.mendix.externalinterface.connector.RequestDispatching$Worker.apply(SourceFile:175) at akka.actor.LocalActorRef.invoke(ActorRef.scala:910) at akka.dispatch.MessageInvocation.invoke(MessageHandling.scala:25) at akka.dispatch.ExecutableMailbox$class.processMailbox(ExecutorBasedEventDrivenDispatcher.scala:223) at akka.dispatch.ExecutorBasedEventDrivenDispatcher$$anon$4.processMailbox(ExecutorBasedEventDrivenDispatcher.scala:123) at akka.dispatch.ExecutableMailbox$class.run(ExecutorBasedEventDrivenDispatcher.scala:195) at akka.dispatch.ExecutorBasedEventDrivenDispatcher$$anon$4.run(ExecutorBasedEventDrivenDispatcher.scala:123) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) at java.lang.Thread.run(Thread.java:662) at akka.dispatch.MonitorableThread.run(ThreadPoolBuilder.scala:192)