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https://issues.apache.org/jira/browse/DERBY-3989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12876668#action_12876668
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Rick Hillegas commented on DERBY-3989:
--------------------------------------

Hi Kristian,

At some point we are going to start supporting environments where people want 
to build and test Derby using Java 6 even though they have experimental Java 7 
jdks on their machines. This may be similar to your situation (a) and may argue 
against (b). Thanks.

> Set the Java 5 compilation path based on the Java 6 compilation path if a 
> Java 5 environment can't be found but a Java 6 environment can be
> -------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-3989
>                 URL: https://issues.apache.org/jira/browse/DERBY-3989
>             Project: Derby
>          Issue Type: Improvement
>          Components: Build tools
>    Affects Versions: 10.5.1.1
>            Reporter: Rick Hillegas
>             Fix For: 10.5.1.1
>
>         Attachments: derby-3989-01-aa-optionalJava5.diff, 
> derby-3989-01-ab-optionalJava5.diff, derby-3989-01-ac-optionalJava5.diff
>
>
> This will make the build even more flexible. Probably involves the following 
> changes:
> 1) Relaxing the requirement in PropertySetter that a Java 5 JDK must exist
> 2) Having PropertySetter look for a Java 6 JDK (and set 
> java16compile.classpath accordingly) just as PropertySetter looks for a Java 
> 5 JDK today
> 3) Changing the setCompilerProperties target in the master build script so 
> that it
>   a) requires that java15compile.classpath or java16compile.classpath is set 
> (it's ok for both to be set)
>   b) sets java15compile.classpath to ${jdbc3stubs}:${java16compile.classpath}

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