java.lang.NoClassDefFoundError: This exception has no message.

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java.lang.NoClassDefFoundError:
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:164)
at com.bea.netuix.nf.factories.TagClassMap$NamespaceTagnameMap.getClass(TagClassMap.java:149)
at com.bea.netuix.nf.factories.TagClassMap.getClass(TagClassMap.java:75)
at com.bea.netuix.nf.factories.ControlTreeFactoryBuilder$ReflectionStreamReader.startElement(ControlTreeFactoryBuilder.java:352)
at weblogic.apache.xerces.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:460)
at weblogic.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(AbstractXMLDocumentParser.java:222)
at weblogic.apache.xerces.impl.XMLNamespaceBinder.handleStartElement(XMLNamespaceBinder.java:875)
at weblogic.apache.xerces.impl.XMLNamespaceBinder.emptyElement(XMLNamespaceBinder.java:592)
at weblogic.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:748)
at weblogic.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(XMLDocumentFragmentScannerImpl.java:1478)
at weblogic.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:330)
at weblogic.apache.xerces.parsers.DTDConfiguration.parse(DTDConfiguration.java:526)
at weblogic.apache.xerces.parsers.DTDConfiguration.parse(DTDConfiguration.java:582)
at weblogic.apache.xerces.parsers.XMLParser.parse(XMLParser.java:153)
at weblogic.apache.xerces.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1176)
at com.bea.netuix.servlets.services.WeblogicXmlServices.doSaxParse(WeblogicXmlServices.java:87)
at com.bea.netuix.nf.factories.ControlTreeFactoryBuilder.getNetuixControlFactory(ControlTreeFactoryBuilder.java:101)
at com.bea.netuix.nf.factories.ControlTreeFactoryBuilder.getNetuixControlFactory(ControlTreeFactoryBuilder.java:75)
at com.bea.netuix.servlets.manager.SingleFileProcessor.getControlFactoryFromFile(SingleFileProcessor.java:616)
at com.bea.netuix.servlets.manager.SingleFileProcessor.getControlFactoryFromFile(SingleFileProcessor.java:558)
at com.bea.netuix.servlets.manager.SingleFileProcessor.getMergedControlFromFile(SingleFileProcessor.java:427)
at com.bea.netuix.servlets.manager.UIServlet.processStream(UIServlet.java:664)
at com.bea.netuix.servlets.manager.UIServlet.getTree(UIServlet.java:554)
at com.bea.netuix.servlets.manager.UIServlet.getTree(UIServlet.java:525)
at com.bea.netuix.servlets.manager.UIServlet.setupJspContext(UIServlet.java:299)
at com.bea.netuix.servlets.manager.UIServlet.doPost(UIServlet.java:224)
at com.bea.netuix.servlets.manager.UIServlet.doGet(UIServlet.java:195)
at com.bea.netuix.servlets.manager.UIServlet.service(UIServlet.java:180)
at com.bea.netuix.servlets.manager.SingleFileServlet.service(SingleFileServlet.java:221)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at weblogic.servlet.AsyncInitServlet.service(AsyncInitServlet.java:124)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:225)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:127)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:283)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:26)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
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:1983)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:1890)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1344)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:181)

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