Jsp:forward problem, help appreciated

hi all,
The following piece of code from a jsp page is giving the following error
"java.lang.IllegalStateException: Error: Attempt to clear a buffer that's already been flushed".
updateToCompAccount is a button on the previous page
<%
if(request.getParameter("updateToCompAccount")!=null){
%>
<jsp:forward page="UpdateToCompAccount.jhtml" />
<% } %>
here is the stack trace:
java.lang.IllegalStateException: Error: Attempt to clear a buffer that's already been flushed
at org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:376)
at org.apache.jsp.adminUserProfileUpdate_jhtml._jspService(adminUserProfileUpdate_jhtml.java:474)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:92)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:162)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:240)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:187)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:200)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:146)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:209)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:144)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2358)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:133)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:118)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:116)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:127)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.ajp.tomcat4.Ajp13Processor.process(Ajp13Processor.java:409)
at org.apache.ajp.tomcat4.Ajp13Processor.run(Ajp13Processor.java:528)
at java.lang.Thread.run(Thread.java:595)
Anybody have any ideas?
Thanks.

Well, the simplest way to do this would be:
public class MyClass extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) {
     String buttonName = request.getParameter("myButtonRequestVariable");
     if ("update".equals(buttonName)) {
           request.getRequestDispatcher("UpdateToCompAccount.jhtml").
                         forward(request, response)
         } else if ("delete".equals(buttonName)) {
              request.getRequestDispatcher("DeleteCompAccount.jhtml").
                        forward(request, response)
         } else {
              request.getRequestDispatcher("ErrorPage.jhtml").
                  forward(request, response)
public void doPost(HttpServletRequest request,
} But that can get unwieldy if you've loads of buttons. Have you studied the concept of Model View Controller (MVC)?

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it's urgent.
so please help me.
kamlesh solanki

hey man,
how u doin?
your problem is quite funny. here in servlet configuration in the xml file there is what we call servlet mapping<servlet-mapping>.
here is how we map a servlet to a kind of url:
<servlet-mapping>
<servlet-name>
havet
<servlet-name>
<url-pattern>
/havva.jspa
</url-pattern>
</servlet-mapping>
nbow when calling this servlet using this url pattern it now behaves as if its in the main application directory just like where jsps are so u will forward to it like a jsp.
thats the shizzy.
ok call it like this now
<jsp:forward page="havva.jspa" />
or
<jsp:forward page="havva.jspa"></jsp:forward>
since u may be used to this style of calling the tag.
stay cool and let me know if u had any problems.

Problem using jsp:forward in java script

hi,
when I use jsp forward tag inside java script i'm getting a problem that
when the jsp is invoked it is getting forwarded to the page specified in the forward tag, without checking the if conditions. Following code may give you a better idea.
<html>
<script>
function test()
if(document.f.htemp.value=="true")
alert("jus");
else
var s=document.f.htemp.value;
alert(s);
<jsp:forward page="success.jsp" />
</script>
<body>
<form name="f" method=post>
<input type=text name=htemp value="true">
<input type=button onclick="test()">
</form>
</body>
</html>
please help me,thanks inadvance
regards
chandu

What pgeuens means is that you can't mix javascript and jsp/java code in this way.
ALL of the jsp/java code gets executed at the server end.
This produces an HTML page (with embedded javascript) which gets sent to the client.
The client then runs javascript code in response to events (onLoad, onClick, onChange etc etc)
So in this case, the jsp:forward will always be executed, because as far as the server is concerned, the javascript is just template text.
If you WANT to do a conditional forwarding on the server side you do it in java ie (horribly using scriptlet)
<%
if (testCondition){
%>
<jsp:forward>
%<
%>Or if you want to test what the client has entered client side, all you can do is submit the form, or navigate to a URL
<script>
function test()
if(document.f.htemp.value=="true")
alert("jus");
else
var s=document.f.htemp.value;
alert(s);
document.f1.action="success.jsp";
document.f.submit();
</script>You cannot run JSP code based on your javascript code.
Java. Javascript. Not the same thing.
Hope this helps,
evnafets

Jsp:forward URL problem

Hi,
I have 2 pages X.jsp and Y.jsp
The content of X.jsp is a simple
// send an email here
<jsp:forward page="Y.jsp">
</jsp:forward>
The content of Y.jsp is only "Mail is sent" message.
The problem is that everytime page X is loaded,
the browser displays Y.jsp content, but the URL in the Address box of the browser still displays X.jsp
This leads me to reload problem, even though the page displays the "Mail is sent" message, the URL still shows X.jsp, and everytime the browser is reloaded, another mail is sent.
How to make the URL change to Y.jsp ?
TIA.

Hi,
I have 2 pages X.jsp and Y.jsp
The content of X.jsp is a simple
// send an email here
<jsp:forward page="Y.jsp">
</jsp:forward>
The content of Y.jsp is only "Mail is sent" message.
The problem is that everytime page X is loaded,
the browser displays Y.jsp content, but the URL in the
Address box of the browser still displays X.jsp
This leads me to reload problem, even though the page
displays the "Mail is sent" message, the URL still
shows X.jsp, and everytime the browser is reloaded,
another mail is sent.
How to make the URL change to Y.jsp ?
TIA.Thats the natural behavious of forward.
One simple solution is not to use forward. You can use HTTP redirection rather than forward.
Hope it helps.

Need code help in jsp:forward ... /

Can any one give a little code as to how am i suppose to redirect my jsp execution with <jsp:forward../> tag.
Give a little code of JSP file. i have tried with 2-3 examples but i could not do it. Certainly some wizard will help me doing this.
Thanx in advance.
husami

its fine. i have understood your code. i have even tested with param attribute.
Earlier i was using JWS2.0 now i have shifted to tomcat. it gives me problem to run jsp file. what could be the reason? servlets are running fine.
is there any path or classpath setting probs
or do i have to execute some other files of tomcat
or do i have to use jspc with some options?.......
please help
husami

I was trying to sync my 120GB iPod Classic earlier and it said it couldn't sync as the iPod disk could not be "read" or "written to". I now can't get anything onto my iPod, and I was wondering if it is a hard drive problem? Any help appreciated. Thanks.

I was trying to sync my 120GB iPod Classic earlier, and it said it couldn't sync as the iPod disk could not be "read" or "written to." I now can't get anything onto my iPod, and I was wondering if it is a hard drive problem? Any help appreciated. Thanks.

Did you go into iTunes to change the location of your media files? if not you will need to go into iTunes and click on preference and select the advance tab then click the iTunes Media folder location. Select the location of your on external hard drive.

Jsp:forward problem, help appreciated

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