[ http://jira.codehaus.org/browse/MJAR-7?page=all ]

Maria Odea Ching moved MNG-1838 to MJAR-7:
------------------------------------------

      Version:     (was: 2.0.1)
    Component:     (was: maven-jar-plugin)
     Workflow: jira  (was: Maven)
          Key: MJAR-7  (was: MNG-1838)
      Project: Maven 2.x Jar Plugin  (was: Maven 2)

> jar plugin recreates jar files all the time
> -------------------------------------------
>
>          Key: MJAR-7
>          URL: http://jira.codehaus.org/browse/MJAR-7
>      Project: Maven 2.x Jar Plugin
>         Type: Bug

>     Reporter: Jochen Wiedmann

>
>
> The jar plugin doesn't seem to check, whether rebuilding a jar file is 
> actually required. For daily work, it would be faster to do what Ant's "jar" 
> task does: Compare the timestamps of the input files with the timestamp of 
> the target file.
> While this approach has the obvious advantage of being safe (and thus 
> possibly well choosen as a default), it is not appropriate for large 
> projects, where a single build requires a real lot of jar files being 
> rebuilt, even if only a single source file has been changed. This applies, in 
> particular, because comparable plugins like the war, ear, and assembly plugin 
> are forced to behave in the same manner.
> Suggestion:
> - Introduce a new property, for example "maven.build.force". The main idea of 
> the property would
>   be, that other plugins (install, war, assembly, ...) would listen to the 
> same property. While they
>   would possible ignore it initially, one could add support later on.
> - The default property value would be true.
> - If the property value is set to false, then the jar plugin compares the 
> timestamps of the input files with
>   the timestamp of the output file. If the latter is newer than the input 
> timestamps, then the jar file isn't
>   being rebuilt.
> I am ready to provide a patch, if my suggestion should find interest.

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