https://issues.apache.org/bugzilla/show_bug.cgi?id=45830

           Summary: Cannot overwrite the older entry in the archive
           Product: Ant
           Version: unspecified
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Build Process
        AssignedTo: notifications@ant.apache.org
        ReportedBy: [EMAIL PROTECTED]


I create jar file. Roll back system time and try to update a jar and merge one
file (config.properties). This doesn't work. If it is ok why copy command has
attribute "overwrite" and jar command doesn't?

How to reproduce:

1. Create folders ant_test, classes and file config.properties
2. Created jar archive
jar cvf ant_test.jar *.* 
3. rollback system time
4. modified config.properties (incremented value of property max.size=2)
5. Executed ant task in build file
  <target name="update_jar">
        <jar destfile="ant_test.jar" update="true">
        <fileset dir="ant_test"/>
        </jar>
  </target>
6. I get warning ( [jar] Warning: classes modified in the future.) and cannot
update config.properties file.


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