hi,
  i am using mysql connector to connet java to mysql in linux, i have done all the formalities to connect linux but i received the follwing error plse help me to rectify the error

Exception: nulljava.lang.IllegalStateException
    at org.apache.coyote.tomcat5.CoyoteResponseFacade.sen dRedirect(CoyoteResponseFacade.java:352)
    at sukhwinder.chat.servlet.LoginServlet.doPost(LoginS ervlet.java:133)
    at javax.servlet.http.HttpServlet.service(HttpServlet .java:717)
    at javax.servlet.http.HttpServlet.service(HttpServlet .java:810)
    at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:237)
    at org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFilterChain.java:157)
    at org.apache.catalina.core.StandardWrapperValve.invo ke(StandardWrapperValve.java:214)
    at org.apache.catalina.core.StandardValveContext.invo keNext(StandardValveContext.java:104)
    at org.apache.catalina.core.StandardPipeline.invoke(S tandardPipeline.java:520)
    at org.apache.catalina.core.StandardContextValve.invo keInternal(StandardContextValve.java:198)
    at org.apache.catalina.core.StandardContextValve.invo ke(StandardContextValve.java:152)
    at org.apache.catalina.core.StandardValveContext.invo keNext(StandardValveContext.java:104)
    at org.apache.catalina.core.StandardPipeline.invoke(S tandardPipeline.java:520)
    at org.apache.catalina.core.StandardHostValve.invoke( StandardHostValve.java:137)
    at org.apache.catalina.core.StandardValveContext.invo keNext(StandardValveContext.java:104)
    at org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:117)
    at org.apache.catalina.core.StandardValveContext.invo keNext(StandardValveContext.java:102)
    at org.apache.catalina.core.StandardPipeline.invoke(S tandardPipeline.java:520)
    at org.apache.catalina.core.StandardEngineValve.invok e(StandardEngineValve.java:109)
    at org.apache.catalina.core.StandardValveContext.invo keNext(StandardValveContext.java:104)
    at org.apache.catalina.core.StandardPipeline.invoke(S tandardPipeline.java:520)
    at org.apache.catalina.core.ContainerBase.invoke(Cont ainerBase.java:929)
    at org.apache.coyote.tomcat5.CoyoteAdapter.service(Co yoteAdapter.java:160)
    at org.apache.coyote.http11.Http11Processor.process(H ttp11Processor.java:793)
    at org.apache.coyote.http11.Http11Protocol$Http11Conn ectionHandler.processConnection(Http11Protocol.jav a:702)
    at org.apache.tomcat.util.net.TcpWorkerThread.runIt(P oolTcpEndpoint.java:571)
    at org.apache.tomcat.util.threads.ThreadPool$ControlR unnable.run(ThreadPool.java:644)
    at java.lang.Thread.run(Thread.java:534)

 thank u for any help from u