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Article:
  Two Servlet Filters Every Web Application Should Have
Subject:   Problem with the ByteArrayOutputStream ...
Date:   2003-11-27 03:07:07
From:   anonymous2
Response to: Caching saves no data

Hello !


I am using jboss-3.2.1_tomcat-4.1.24 Bundle ...


I have exactly the same problem ...
The ByteArrayOutputStream is still empty after the :
chain.doFilter(req, wrappedResponse);


If i try :
System.out.println("CacheFilter : BAOS Size = " + baos.size());


I get : BAOS size = 0 ...


So :
FileOutputStream fos = new FileOutputStream(file);
fos.write(baos.toByteArray());


is only creating an empty cache ...


I don't know where I missed something, so if you have a clue, tell me please ^_^


Thomas.
(taimonetti@kourosivo.com)

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Showing messages 1 through 5 of 5.

  • Problem solved ^_^
    2003-11-27 03:30:41  anonymous2 [View]

    Hello all !

    OK, problem solved ...
    In fact in the file web.xml :

    <filter-mapping>
    <filter-name>CacheFilter</filter-name>
    <url-pattern>*.jsp</url-pattern>
    </filter-mapping>
    <filter-mapping>
    <filter-name>GZIPFilter</filter-name>
    <url-pattern>*.jsp</url-pattern>
    </filter-mapping>

    You need to declare your CacheFilter filter-mapping before your GZIPFilter filter-mapping ...

    And then everything is ok :)

    Thanks Jayson for your filters,

    Thomas.
    • Problem solved ^_^
      2003-12-02 15:26:36  anonymous2 [View]

      I am glad your solution worked. However I must have another issue as I don't even have the GZIPFiler enabled. I have taken everything out of the web.xml except the cache filter and still no joy.
      • Problem solved
        2005-01-07 04:48:16  mcr [View]

        This also worked with Tomcat 5, but without
        requiring the clumsy empty file include:

        <% out.flush(); %>
      • Problem solved ^_^
        2005-01-06 12:54:28  mcr [View]

        I finally solved this problem by importing an empty html file with flush=true at the very end of each cached page, as so:

        • Problem solved ^_^
          2005-01-06 12:55:29  mcr [View]

          Sorry:

          >jsp:include page="/include/empty.html" flush="true" /<