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

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This exception has no message.
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.security.service.SecurityServiceManager.runAs(SecurityServiceManager.java:744)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3086)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:153)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:134)

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