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java.lang.NullPointerException: 	at java.lang.Class.isAssignableFrom(Native Method)	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$ServletInvocationAction.run(ServletStubImpl.java:945)	at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:332)	at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:242)	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:5352)	at weblogic.security.service.SecurityServiceManager.runAs(SecurityServiceManager.java:718)	at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3032)	at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2466)	at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:152)	at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:133)