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Hi, I have deployed my web service application in two machines. I am doing performance testing using JMeter by firing large number of requests i.e; web service calls (at the rate of 160 requests/ minute). For some of the requests I am getting the following exceptions (Stack trace given below). The issue is more frequent when machine1 redirects the web service call to machine2. Http11Processor] Error finishing response java.lang.NullPointerException at org.apache.tomcat.util.http.MimeHeaders.setValue(MimeHeaders.java:26) at org.apache.coyote.http11.Http11Processor.prepareResponse(Http11Procesor.java:1537) at org.apache.coyote.http11.Http11Processor.action(Http11Processor.java:962) at org.apache.coyote.Response.action(Response.java:180) at org.apache.coyote.http11.InternalOutputBuffer.endRequest(InternalOututBuffer.java:388) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.jav:906) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.ProcessConnection(Http11BaseProtocol.java:664) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112) at java.lang.Thread.run(Thread.java:595) ---------------------------------------------------------------- [Http11BaseProtocol] Error reading request, ignored java.lang.NullPointerException at org.apache.tomcat.util.http.MimeHeaders.clear(MimeHeaders.java:129) at org.apache.coyote.Response.recycle(Response.java:578) at org.apache.coyote.http11.InternalOutputBuffer.nextRequest(InternalOutputBuffer.java:355) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:929) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112) at java.lang.Thread.run(Thread.java:595) I had a guess that this is an issue with tomcat container's trequest timeout or some stuff similar to that. I tried changing parameters like 'acceptCount', 'socketBuffer', 'maxKeepAliveRequests', 'maxSpareThreads', 'minSpareThreads', 'maxThreads', 'maxHttpHeaderSize' etc. in server.xml file but in vain. I have also tried to increase the web service timeout period on redirecting from machine1 to machine2 but this also did not help. Any hints? All sorts of suggestions are appreciated. Thanks in Advance, Viorel Jesson Peterson