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

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java.lang.NullPointerException:
at weblogic.knex.wsdlgen.WsdlTypeBagImpl.getElemRef(WsdlTypeBagImpl.java:928)
at weblogic.knex.wsdlgen.WsdlTypeBagImpl.crackClass(WsdlTypeBagImpl.java:386)
at weblogic.knex.wsdlgen.WsdlTypeBagImpl.addType(WsdlTypeBagImpl.java:522)
at weblogic.knex.wsdlgen.WsdlTypeBagImpl.filter(WsdlTypeBagImpl.java:606)
at weblogic.knex.wsdlgen.WsdlTypeBagImpl.getElemRef(WsdlTypeBagImpl.java:940)
at weblogic.knex.wsdlgen.WsdlTypeBagImpl.addParamHolder(WsdlTypeBagImpl.java:121)
at weblogic.knex.wsdlgen.Schemas.addPartHolder(Schemas.java:45)
at weblogic.knex.wsdlgen.TypeXlatorImpl.createMessage(TypeXlatorImpl.java:221)
at weblogic.knex.wsdlgen.TypeXlatorImpl.fromJavaOp(TypeXlatorImpl.java:721)
at weblogic.knex.wsdlgen.TypeXlatorImpl.fromJavaService(TypeXlatorImpl.java:831)
at weblogic.knex.dispatcher.TypeUtils.makeWsdlService(TypeUtils.java:1388)
at weblogic.knex.dispatcher.TypeUtils.makeWsdl(TypeUtils.java:1459)
at weblogic.knex.dispatcher.DispFile.makeDispClass(DispFile.java:2528)
at weblogic.knex.dispatcher.DispFile.makeDispFile(DispFile.java:611)
at weblogic.knex.dispatcher.DispUnit.makeDispUnit(DispUnit.java:50)
at weblogic.knex.dispatcher.DispCache.ensureDispUnit(DispCache.java:584)
at weblogic.knex.dispatcher.HttpServer.doGet(HttpServer.java:297)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:945)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:332)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:242)
at weblogic.security.service.SecurityServiceManager.runAs(SecurityServiceManager.java:718)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3032)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:152)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:133)

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