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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=19492

jarlib-display fails on jars without manifest

           Summary: jarlib-display fails on jars without manifest
           Product: Ant
           Version: 1.5.2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: Other
         Component: Optional Tasks
        AssignedTo: [EMAIL PROTECTED]
        ReportedBy: [EMAIL PROTECTED]


The task throws an NP at 
org.apache.tools.ant.taskdefs.optional.extension.Extension.getListed
(Extension.java:660)
,if the jar library does not contain a manifest.
The very reason is a bug in ExtensionUtil.getManifest( file ):
Line 255 = "return jarFile.getManifest();"
-> premature exit, even if manifest is null

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