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Tomcat 6.0.20 Returning NullPointer upon closing response.getWriter()

 
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Tomcat returned NullpointerException upon closing response.getWriter(). This does not occur always but sometimes.
Not able to figure out the reason.

java.lang.NullPointerException
at org.apache.coyote.http11.InternalOutputBuffer.realWriteBytes(InternalOutputBuffer.java:740)
at org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:434)
at org.apache.coyote.http11.InternalOutputBuffer.endRequest(InternalOutputBuffer.java:390)
at org.apache.coyote.http11.Http11Processor.action(Http11Processor.java:987)
at org.apache.coyote.Response.action(Response.java:183)
at org.apache.coyote.Response.finish(Response.java:305)
at org.apache.catalina.connector.OutputBuffer.close(OutputBuffer.java:276)
at org.apache.catalina.connector.CoyoteWriter.close(CoyoteWriter.java:108)
at com.onmobile.platform.sovxml.ControlServlet.doGet(ControlServlet.java:3482) --> #response.getWriter().close()
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
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:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:567)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:361)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
at java.lang.Thread.run(Thread.java:595
 
Author and all-around good cowpoke
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My guess would be that the response stream was closed somewhere else -or- was never created.

Here is that method in tomcat 6.0.18


Bill
 
chinmay totekar
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Thanks
The problem was response.getWriter() object was declared as global in servlet, so it became common to all threads. and if one thread closes it, it used to give NullPtrException in other threads.

 
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