My servlet dont want to redirect

I wrote a servlet, BackEnd.class, that handle all XML requests of a SWF movie. One of these requestes open BackEnd.class in a new window and BackEnd should redirect the visitor to a JSP page. I used the following instructions:
//redirect to a JSP page
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher( "/prepareUpload.jsp?destination=dest");
dispatcher.forward( request, response );
But the servlet dont work. It returns an error 500 (I copied the errors after this message).
My hypothesis is that it is illegal to set the content type or to touch the response object before the redirection. Is it that the problem... because it would imply changing a lot of things in my servlet :(....
Any suggestion?
thx in advance
java.lang.IllegalArgumentException: Short Read
at javax.servlet.http.HttpUtils.parsePostData(HttpUtils.java:238)
at org.apache.tomcat.util.RequestUtil.readFormData(RequestUtil.java:101)
at org.apache.tomcat.core.RequestImpl.handleParameters(RequestImpl.java:719)
at org.apache.tomcat.core.RequestImpl.getParameterValues(RequestImpl.java:259)
at org.apache.tomcat.core.RequestImpl.getParameter(RequestImpl.java:250)
at org.apache.tomcat.facade.HttpServletRequestFacade.getParameter(HttpServletRequestFacade.java:223)
at org.apache.jasper.servlet.JspServlet.preCompile(JspServlet.java:437)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:480)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)
at org.apache.tomcat.core.Handler.service(Handler.java:287)
at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
at org.apache.tomcat.facade.RequestDispatcherImpl.doForward(RequestDispatcherImpl.java:222)
at org.apache.tomcat.facade.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:162)
at BackEnd.upload(BackEnd.java:185)
at BackEnd.doPost(BackEnd.java:115)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)
at org.apache.tomcat.core.Handler.service(Handler.java:287)
at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:797)
at org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
at org.apache.tomcat.service.connector.Ajp12ConnectionHandler.processConnection(Ajp12ConnectionHandler.java:166)
at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:501)
at java.lang.Thread.run(Thread.java:484)

thx priviet,
it worked with response.sendRedirect( String path ).
Meanwhile I found the cause of the error. It is a known bug in Jakarta-Tomcat.
More information is available in the tomcat-user mailing list.
This bug is not present in JRun.

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Code in when-button-pressed
DECLARE
V_Usr_Prm Varchar2 (1000);
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PROCEDURE WEB_SHOW_DOCUMENT_PROC (runformat varchar2,
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Code in when-button-pressed
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V_Usr_Prm Varchar2 (1000);
BEGIN
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v_a VARCHAR2 (10);
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v_a := LTRIM (TO_CHAR (TRUNC (ASCII (SUBSTR (vc_url, i, 1)) / 16)));
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THEN
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|| userparameters;
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