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java.lang.NullPointerException at weblogic.xml.schema.binding.RuntimeUtils.lookup_serializer(RuntimeUtils.java:144) at weblogic.xml.schema.binding.RuntimeUtils.invoke_serializer(RuntimeUtils.java:184) at weblogic.xml.schema.binding.RuntimeUtils.invoke_serializer(RuntimeUtils.java:171) at weblogic.webservice.core.DefaultPart.toXML(DefaultPart.java:252) at weblogic.webservice.core.DefaultMessage.toXML(DefaultMessage.java:455) at weblogic.webservice.core.DefaultOperation.invoke(DefaultOperation.java:403) at weblogic.webservice.core.DefaultOperation.invoke(DefaultOperation.java:359) at weblogic.webservice.core.rpc.CallImpl.invoke(CallImpl.java:416) at weblogic.webservice.core.rpc.CallImpl.invoke(CallImpl.java:290) at jsp_servlet.__helloclient._jspService(__helloclient.java:149) at weblogic.servlet.jsp.JspBase.service(JspBase.java:27) at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:1058) at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:401) at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:306) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:5412) at weblogic.security.service.SecurityServiceManager.runAs(SecurityServiceManager.java:744) at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3086) at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2544) at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:153) at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:134)