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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 36162] New: - Possible Memory Leak with LinkRewriterTransformer
Date Fri, 12 Aug 2005 12:54:48 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=36162

           Summary: Possible Memory Leak with LinkRewriterTransformer
           Product: Cocoon 2
           Version: Current SVN 2.2
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P2
         Component: blocks
        AssignedTo: dev@cocoon.apache.org
        ReportedBy: ron@rblasch.org


I'm currently looking into a memory leak issue at Apache Forrest.  Forrest's
site currently needs to be built with -Xmx128m because of this.  I believe the
issue is originated at Cocoon's LinkRewriterTransformer or XMLFileModule.

A memory profiler shows lots (30MB+) of DOM DocumentImpls (150+ objects), which
get referenced by XMLFileModule.DocumentHelper.  Their URIs are linkmap-xxx.

LinkRewriterTransformer#createTransformedLink(String) uses a InputModuleHelper,
which seems to reference a XMLFileModule.
  ...
  newLink = (String) modHelper.getAttribute(this.objectModel,
                     ^^^^^^^^^
  ...

The XMLFileModule keeps the visited documents in a map, which is where they
build up.

Just for testing, I changed XMLFileModule#getDocumentHelper(Configuration) from
  this.documents.put(src, new DocumentHelper(reload, cache, src, this));
to
  return new DocumentHelper(reload, cache, src, this);

Thus, a new DocumentHelper is created every time, instead of caching them.  The
result: No more memory problems, Apache Forrest's site builds again with -Xmx32.

Ron

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