OutOfMemoryError:Java Heap Space on JSP with %@page buffer % directive

Hi guys,
I am developing a large report requires a lot of memory using JSP, therefore I allocated about 4096kb in the JSP as follow:
==================================================================
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%@taglib uri="http://jakarta.apache.org/struts/tags-bean" prefix="bean" %>
<%@taglib uri="http://jakarta.apache.org/struts/tags-html" prefix="html" %>
<%@taglib uri="http://jakarta.apache.org/struts/tags-logic" prefix="logic" %>
<%@page buffer="4096kb" %>
<html>...some work to display report ...</html>
==================================================================
The report runs fine but after few retrieves I got the OutOfMemoryError (OOME) and the only way for me to fix it is to restart the web server (tomcat). I went throught few troubleshooting tests and found out if I take out the <%@page buffer="4096kb" %> in the page, the error will go away regardless how much data I am retrieving from database (In another words, if I put this code into a report to retrieve a small data set, I will still get OOME after few tries). I know you can manually enlarge the Java Memory/Heap size, but it will not fix the problem as it will eventually run out of memory anyway. I am wondering is there known bugs relating to manually allocate buffer size for JSP pages? And how can i deal with it if it is a JSP "Bug"? Or there is something else I am doing wrong. (I have tried manually invoke System.gc() but it will not solve the problem)
any help is appreciated, Thanks.

Thanks for these information, you are truely amazing with amount of knowledge you have and your analytical skills.
Back to the topic:
<quote>
Only if you waste time with all the intermediate values that are also too big, and only if you persist in your illusion that you are buying performance with these huge buffers. You aren't. You are buying OutOfMemoryErrors instead.
You do need to realize that your output will be (i) buffered by the socket send buffer, which is only 8k on Windows, and (ii) transmitted in packets of the path MTU, which is less than 1500 bytes in most cases, so this huge buffer can't possibly do you any good - it just adds latency and OutOfMemoryError risk, as I've been telling you.
</quote>
I don't know which part of my replay does not agree with you that setting the buffer size too large is more of an problem other than a solution, perhaps I miss leaded you somehow.
<quote>That doesn't actually answer the question, does it?</quote>
Well if a page can be complied and retrieved in the first place, is there enough space to create the page/object? Perhaps you can tell me if I am wrong about it and why.
I believe the JspWriter object is stored in heap and heap is break up into few sections. I wouldn't be able to tell you for sure which section it resides but my guess is in Eden Space and that space is just about 4MB in space. But remeber I did my test by changing the buffer size to 2MB which is well under the 4MB, I still get the same error.
<quote>That was what your question was about. OutOfMemoryError using huge buffers. So that's what I focussed on.</quote>
Yes, you did ponting me out that but what you have done is told me not to use it, which I am very happy with. In my older post, I did actually correct myself and made my question more clear by asking
"Why with large JSP buffer size, the retrival of the JSP page chewing up the server memory? Shoudlnt memory be released after the page is retrieved?"
Unfortunitelly I don't think you pointing me anything about it, instead you told me all the reasons not to do it and assuming that I was arguing with you about "it is better to have large buffer jsp size". Again, sorry if I miss leaded you somehow.
Lets put it this way, even with large jsp buffer size (regardless whether we should be doing that or not) if the memory is freed properly, I will not get OOM error. Am I right?
<quote>I take out the <%@page buffer="4096kb" %> in the page, the error will go away</quote>
Yes, but I need to restart my server to make it work. I forgot to mention it, my bad.
Last, I finally found my answer through web and other forumes. The reason of this happening is because my web server did not release the PageContext object properly which JspWriter is linked to, therefore the memory does not get released at all. So ths the issue that chewing up the server memory. Again, thank you for all your help, your suggestion and knowledge did help me find out my answer in the end.

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                 sheet = null;
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                 sheet = null;
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                 sheet = null;
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                 sheet = null;
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    </body>Regards
    Venky
    Edited by: Venky_86 on Jun 17, 2009 6:05 AM

    HOW did you increase the heap space? As that is the only solution you have in this case really.
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  • One app service getting "java.lang.OutOfMemoryError: Java heap space"

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    Hello,
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  • EJB Deployment error in 9.2 (java.lang.OutOfMemoryError: Java heap space at

    Hello all,
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    Compiler failed executable.exec: The system is out of resources. Consult the following stack trace for details. java.lang.OutOfMemoryError: Java heap space

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    -- Rob
    WLS Blog http://dev2dev.bea.com/blog/rwoollen/

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    Hello all,
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    Compiler failed executable.exec: The system is out of resources. Consult the following stack trace for details. java.lang.OutOfMemoryError: Java heap space

    I'd suggest pre-compiling the application before deployment.
    java weblogic.appc my.ear
    (You may need to increase the heap size here as well.)
    -- Rob
    WLS Blog http://dev2dev.bea.com/blog/rwoollen/

  • Servlet - java.lang.OutOfMemoryError: Java heap space

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  • How to solve :  java.lang.OutOfMemoryError: Java heap space

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    java.lang.OutOfMemoryError: Java heap space
    >
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    >
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    ####<28/11/2010 GMT 09:26:59 ص> <Notice> <Server> <javaserver> <AdminServer> <DynamicListenThread[Default[1]]> <<WLS Kernel>> <> <3e9ac2aaa3059905:3bfb8868:12c91bef422:-8000-0000000000000035> <1290936419289> <BEA-002607> <Channel "Default[1]" listening on 127.0.0.1:7001 was shutdown.>
    ####<28/11/2010 GMT 09:27:07 ص> <Notice> <WebLogicServer> <javaserver> <AdminServer> <Thread-41> <<WLS Kernel>> <> <3e9ac2aaa3059905:3bfb8868:12c91bef422:-8000-000000000000002f> <1290936427508> <BEA-000378> <Server failed to shutdown within the configured timeout of 30 seconds. The server process will exit now.>
    i searched the net and it seems that i should increase the java heap size , how can i do that... I have a server with 4G Ram ..
    Regards,
    Lama
    Edited by: Delta on Nov 28, 2010 1:36 AM

    My frien google tells me that you use
    >
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    >
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