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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)