JAXB unmarshaller error in JAX-WS web service

Question

Hi,
We have a JAX-WS web service deployed to WLS 10.3.3.0 as an EAR file. The EAR file deploys without any problems, but the first time we attempt to call an operation we get a classloading problem when we run the following code snippet (I've put a comment after the failed line of code):
          Object jaxbObject = null;
          Unmarshaller unmarshaller = null;          
          try {
               unmarshaller = JAXB_CTX.createUnmarshaller(); // JAXB_CTX is an instance of JAXBContext
               jaxbObject = unmarshaller.unmarshal(new ByteArrayInputStream(xmlString.getBytes())); // this line fails
          } catch (JAXBException e) {
If we update the EAR file or delete and re-install the EAR file in the WLS console then the problem doesn't go away, but if we restart the WL server that hosts the EAR file then the problem is resolved. The problem is consistently repeatable.
The stacktrace for the error is:
java.lang.ClassCastException: org.apache.xerces.parsers.XML11Configuration
     at org.apache.xerces.parsers.DOMParser.<init>(Unknown Source)
     at org.apache.xerces.parsers.DOMParser.<init>(Unknown Source)
     at org.apache.xerces.jaxp.DocumentBuilderImpl.<init>(Unknown Source)
     at org.apache.xerces.jaxp.DocumentBuilderFactoryImpl.newDocumentBuilder(Unknown Source)
     at com.sun.org.apache.xalan.internal.xsltc.trax.SAX2DOM.createDocument(SAX2DOM.java:326)
     at com.sun.org.apache.xalan.internal.xsltc.trax.SAX2DOM.<init>(SAX2DOM.java:85)
     at com.sun.org.apache.xalan.internal.xsltc.runtime.output.TransletOutputHandlerFactory.getSerializationHandler(TransletOutputHandlerFactory.java:187)
     at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.getOutputHandler(TransformerImpl.java:392)
     at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerHandlerImpl.setResult(TransformerHandlerImpl.java:137)
     at com.sun.xml.bind.v2.runtime.unmarshaller.DomLoader$State.<init>(DomLoader.java:74)
     at com.sun.xml.bind.v2.runtime.unmarshaller.DomLoader.startElement(DomLoader.java:113)
     at com.sun.xml.bind.v2.runtime.unmarshaller.ProxyLoader.startElement(ProxyLoader.java:56)
     at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallingContext._startElement(UnmarshallingContext.java:456)
     at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallingContext.startElement(UnmarshallingContext.java:433)
     at com.sun.xml.bind.v2.runtime.unmarshaller.SAXConnector.startElement(SAXConnector.java:138)
     at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
     at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
     at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
     at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
     at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
     at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
     at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:211)
     at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:184)
     at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:137)
     at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:184)
     at com.northernrock.applicationdataservice.interaction.util.ServiceSoapPortUtil.generateJAXBObjectFromXML(ServiceSoapPortUtil.java:184)
     at com.northernrock.applicationdataservice.interaction.util.DataMapper.mapFullApplication(DataMapper.java:130)
     at com.northernrock.applicationdataservice.interaction.ServiceSoapPort.retrieveFullApplicationData(ServiceSoapPort.java:148)
     at com.northernrock.applicationdataservice.interaction.ServiceSoapPortImpl.retrieveFullApplicationData(ServiceSoapPortImpl.java:69)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:597)
     at weblogic.wsee.jaxws.WLSInstanceResolver$WLSInvoker.invoke(WLSInstanceResolver.java:92)
     at weblogic.wsee.jaxws.WLSInstanceResolver$WLSInvoker.invoke(WLSInstanceResolver.java:74)
     at com.sun.xml.ws.server.InvokerTube$2.invoke(InvokerTube.java:151)
     at com.sun.xml.ws.server.sei.EndpointMethodHandlerImpl.invoke(EndpointMethodHandlerImpl.java:265)
     at com.sun.xml.ws.server.sei.SEIInvokerTube.processRequest(SEIInvokerTube.java:100)
     at com.sun.xml.ws.api.pipe.Fiber.__doRun(Fiber.java:604)
     at com.sun.xml.ws.api.pipe.Fiber._doRun(Fiber.java:563)
     at com.sun.xml.ws.api.pipe.Fiber.doRun(Fiber.java:548)
     at com.sun.xml.ws.api.pipe.Fiber.runSync(Fiber.java:445)
     at com.sun.xml.ws.server.WSEndpointImpl$2.process(WSEndpointImpl.java:373)
     at com.sun.xml.ws.transport.http.HttpAdapter$HttpToolkit.handle(HttpAdapter.java:524)
     at com.sun.xml.ws.transport.http.HttpAdapter.handle(HttpAdapter.java:255)
     at com.sun.xml.ws.transport.http.servlet.ServletAdapter.handle(ServletAdapter.java:141)
     at weblogic.wsee.jaxws.WLSServletAdapter.handle(WLSServletAdapter.java:210)
     at weblogic.wsee.jaxws.HttpServletAdapter$AuthorizedInvoke.run(HttpServletAdapter.java:311)
     at weblogic.wsee.jaxws.HttpServletAdapter.post(HttpServletAdapter.java:223)
     at weblogic.wsee.jaxws.JAXWSServlet.doPost(JAXWSServlet.java:124)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
     at weblogic.wsee.jaxws.JAXWSServlet.service(JAXWSServlet.java:79)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:821)
     at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
     at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
     at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
     at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:184)
     at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.doIt(WebAppServletContext.java:3686)
     at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3650)
     at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
     at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
     at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2268)
     at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2174)
     at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1446)
     at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
     at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)
There seems to be something strange going on with the classloading, such that re-deploying the application causes the wrong Xerces parser classes to be loaded until the WL server is restarted. Once the restart is done then there is no problem until the next re-deployment.
Does anyone know a fix for this issue?
Any help is appreciated.
Thanks,
Jason

Answer 1

Hi Jason,
Below is the sample.....You can use this..
JAXBElement<Task> root = null;
          try {
               ByteArrayInputStream input = new ByteArrayInputStream(
                         xmlStr.getBytes());
               JAXBContext jc = JAXBContext.newInstance(Task.class);
               Unmarshaller u = jc.createUnmarshaller();
               StreamSource sc = new StreamSource(new StringReader(
                         xmlStr.toString()));
               root = u.unmarshal(new StreamSource(input), Task.class);
          } catch (Exception e) {
               e.printStackTrace();
          }