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https://issues.apache.org/jira/browse/DERBY-3700?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Knut Anders Hatlen updated DERBY-3700:
--------------------------------------

    Attachment: d3700.diff

The attached patch (d3700.diff) makes the build scripts create an empty 
directory under classes when the engine target is invoked, and changes the 
variable empty so that it points to the directory instead of the jar. I'm able 
to build Derby with JAVA_HOME set to 1.5 or 1.6 with these changes. I have also 
started the regression tests using both Java version 1.4.2  and version 1.6 to 
see if this change introduces dependencies on a specific Java version.

Output from svn stat:

M      build.xml
D      tools/java/empty.jar
M      tools/ant/properties/compilepath.properties

> Get rid of tools/java/empty.jar
> -------------------------------
>
>                 Key: DERBY-3700
>                 URL: https://issues.apache.org/jira/browse/DERBY-3700
>             Project: Derby
>          Issue Type: Improvement
>          Components: Build tools
>            Reporter: Knut Anders Hatlen
>            Assignee: Knut Anders Hatlen
>            Priority: Trivial
>         Attachments: d3700.diff
>
>
> empty.jar is used to prevent the Java compiler from putting the default Java 
> runtime libraries in the boot classpath. An empty directory would also work, 
> so we could remove the jar file from the source repository and instead let 
> the build scripts create an empty directory for us.

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