DO NOT REPLY [Bug 34725] New: - sysproperty gives unhelpful message when value omitted

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http://issues.apache.org/bugzilla/show_bug.cgi?id=34725

           Summary: sysproperty gives unhelpful message when value omitted
           Product: Ant
           Version: 1.5.1
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Keywords: ErrorMessage
          Severity: normal
          Priority: P2
         Component: Core tasks
        AssignedTo: dev@ant.apache.org
        ReportedBy: smiley@photiczone.com


There is nothing wrong with providing system properties such as the following:
  java -DFLAG ExampleClass
rather than
  java -DFLAG=true ExampleClass

I know I can achieve this in a <java> task using
  <jvmarg value="-DFLAG"/>
but since this is actually a system property, I would also expect to be able to
do:
  <sysproperty key="FLAG"/>
but apparently not.  If I miss out the 'value', rather than getting a message 
explaining that ant makes the value mandatory (even though it arguably 
shouldn't be), it just throws a java.lang.NullPointerException.

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