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From: bugzilla@apache.org
To: notifications@ant.apache.org
Subject: DO NOT REPLY [Bug 44368]  New:  - NPE in Sort
Message-ID: <bug-44368-48744@http.issues.apache.org/bugzilla/>
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Date: Wed,  6 Feb 2008 04:27:48 -0800 (PST)
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http://issues.apache.org/bugzilla/show_bug.cgi?id=44368

           Summary: NPE in Sort
           Product: Ant
           Version: 1.7.0
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: critical
          Priority: P2
         Component: Core
        AssignedTo: notifications@ant.apache.org
        ReportedBy: rruiz@gridsystems.com


I am experiencing this error in some of my projects:

java.lang.NullPointerException
        at org.apache.tools.ant.types.resources.Sort$SortedBag$MutableInt.access$100(Sort.java:44)
        at org.apache.tools.ant.types.resources.Sort$SortedBag$MyIterator.next(Sort.java:60)
        at org.apache.tools.ant.types.resources.FailFast.next(FailFast.java:115)
        at org.apache.tools.ant.taskdefs.DependSet.uptodate(DependSet.java:233)
        at org.apache.tools.ant.taskdefs.DependSet.execute(DependSet.java:202)
        at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
        at sun.reflect...

The exception is thrown when some specific jars are included in a <dependset> task, but only at
certain positions. If I move those jars up or down in the list, the error disappears.

Looking at the source code, it looks like a case of concurrent modification in Sort$SortedBag, but I
have been unable to find out why or where.

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