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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 42696] New: - OutOfMemoryError using unzip Task
Date Tue, 19 Jun 2007 13:33:21 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=42696

           Summary: OutOfMemoryError using unzip Task
           Product: Ant
           Version: 1.7.0
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: major
          Priority: P2
         Component: Core tasks
        AssignedTo: dev@ant.apache.org
        ReportedBy: b.eicki@gmx.net


If I try to expand a rather huge zip file (in my case 42910 files, 783359kb 
uncompressed, 66906kb compressed) using the unzip task I get a 

java.lang.OutOfMemoryError: requested 37904 bytes for Chuck::new. Out of swap 
space?

My Java Options (Jdk 1.5.0_08 / Jdk 1.6_01) are

ANT_OPTS=-XX:NewRatio=2 -Xms512m -Xmx1024m -verbose:gc -XX:+PrintGCDetails

on a windows xp pro 32-bit system with a total of 2 GB memory available.
The problem now seems that this operation does not need much memory from the 
heap, so only one gc happens

[GC [DefNew: 139776K->17472K(157248K), 0.1300398 secs] 139776K->29555K(506816K),
 0.1301295 secs]

while the memory usage given by the windows task manager for the java process 
constantly increases towards 1GB before the process terminates.
If I reduce either Xms or increase NewRatio more gc happen and the memory usage 
as shown by the task manager never increases to more than 400 MB. At each gc it 
drops to 200 MB or less.
Decreasing Xms or increasing NewRatio is obviously a valid workaround for me, 
but nevertheless it is some kind of a memory leak here.

I even tried to find a cause for this (native) memory leak and it seems to be 
within org.apache.tools.zip.ZipFile. For me it seems that "new Inflater(true)"
causes this problem (though changing it simply to false will of course not 
work), because the problem still occurs if you comment out "extractFile" method 
in Expand.java such that nothing is really done except opening up input streams 
from the ZipFile for a number of ZipEntry objects.

So maybe this is in its core not a bug of ant, but a bug of the native java 
implementation for windows.

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