Servlet.service() exception when using sendRedirect()

Question

I received the following error after increasing response buffer:

SEVERE: Servlet.service() for servlet jsp threw exception java.lang.NullPointerException
    at org.apache.jsp.redirects.redirects_005flist_jsp._jspService(redirects_005flist_jsp.java:325)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    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:230)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
    at java.lang.Thread.run(Unknown Source)

I'm putting below line in the JSP:

Welcome <%=userSession.getFirstName() %>!

since the user session is null it should redirect to login page, but it is not and when it reaches the above line it is throwing exception.

Can you post your code. That will help in solving your issues. — Uchenna Nwanyanwu, Jul 03 '12 at 10:16

score 0 · Answer 1 · edited May 23 '17 at 10:28

0

I think the response is committed before the sendRedirect() happened.

Response committing might happen due to the reasons Causes for Response comitting

edited May 23 '17 at 10:28

Community

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1

answered Jul 03 '12 at 06:43

Ramesh PVK

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I increased the buffer size if the jsp but still getting the same error – Sinha Jul 03 '12 at 07:14
Increase the response buffer size also. Edited the link in my answer please check. – Ramesh PVK Jul 03 '12 at 07:26
How to increase response buffer size? – Sinha Jul 03 '12 at 07:31
ServletRespnse.setBufferSize(), the link in my answer explains this. – Ramesh PVK Jul 03 '12 at 07:43
if (userSession == null){ //response.sendRedirect("../login.jsp?currenturl=" + currentURL); response.setBufferSize(2000); response.sendRedirect("../login.jsp"); }and i'm getting above error(as edited)..I have no idea why it is coming out of the if block. – Sinha Jul 03 '12 at 09:19
sendRedirect() wont conclude the request/response. You need to return after that to prevent any code below that line from executing. – Steven Benitez Jul 03 '12 at 18:36

score 0 · Answer 2 · edited Oct 03 '13 at 18:11

0

Basically you should replace every time you use

resposnse.redirect("abc.jsp");

with

RequestDispatcher rd = request.getRequestDispatcher("abc.jsp");
        rd.forward(request, response);

beginning from the first time you used it in the very project or session

edited Oct 03 '13 at 18:11

StormeHawke

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answered Oct 03 '13 at 17:28

Abhilash Guha

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Servlet.service() exception when using sendRedirect()

2 Answers2

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