Hi

I have a servlet and when i call reponse.getWriter().flushBuffer() OR
reponse.getWriter().println("SOME TEXT"), sometimes it gives following types
of errors. This error does not occur always but sometimes. What can be the
reason for this?

*********** ERROR ************
java.lang.NullPointerException
        at 
org.apache.tomcat.util.http.MimeHeaders.setValue(MimeHeaders.java:267)
        at
org.apache.coyote.http11.Http11Processor.prepareResponse(Http11Processor.java:1578)
        at
org.apache.coyote.http11.Http11Processor.action(Http11Processor.java:944)
        at org.apache.coyote.Response.action(Response.java:183)
        at org.apache.coyote.Response.sendHeaders(Response.java:379)
        at
org.apache.catalina.connector.OutputBuffer.doFlush(OutputBuffer.java:305)
        at 
org.apache.catalina.connector.OutputBuffer.close(OutputBuffer.java:273)
        at 
org.apache.catalina.connector.CoyoteWriter.close(CoyoteWriter.java:108)
        at
com.onmobile.platform.sovxml.ControlServlet.doGet(ControlServlet.java:3482)
        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






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