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java.lang.NullPointerException: 	at servletws.HelloServlet.hello(HelloServlet.java:15)	at servletws.HelloServletDelegate.hello(HelloServletDelegate.java:15)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at com.sun.xml.ws.api.server.InstanceResolver$1.invoke(InstanceResolver.java:246)	at com.sun.xml.ws.server.InvokerTube$2.invoke(InvokerTube.java:146)	at com.sun.xml.ws.server.sei.EndpointMethodHandler.invoke(EndpointMethodHandler.java:257)	at com.sun.xml.ws.server.sei.SEIInvokerTube.processRequest(SEIInvokerTube.java:93)	at com.sun.xml.ws.api.pipe.Fiber.__doRun(Fiber.java:595)	at com.sun.xml.ws.api.pipe.Fiber._doRun(Fiber.java:554)	at com.sun.xml.ws.api.pipe.Fiber.doRun(Fiber.java:539)	at com.sun.xml.ws.api.pipe.Fiber.runSync(Fiber.java:436)	at com.sun.xml.ws.server.WSEndpointImpl$2.process(WSEndpointImpl.java:243)	at com.sun.xml.ws.transport.http.HttpAdapter$HttpToolkit.handle(HttpAdapter.java:444)	at com.sun.xml.ws.transport.http.HttpAdapter.handle(HttpAdapter.java:244)	at com.sun.xml.ws.transport.http.servlet.ServletAdapter.handle(ServletAdapter.java:135)	at com.sun.xml.ws.transport.http.servlet.WSServletDelegate.doGet(WSServletDelegate.java:129)	at com.sun.xml.ws.transport.http.servlet.WSServletDelegate.doPost(WSServletDelegate.java:160)	at com.sun.xml.ws.transport.http.servlet.WSServlet.doPost(WSServlet.java:75)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)	at java.lang.Thread.run(Thread.java:619)