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https://issues.apache.org/jira/browse/DERBY-3117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12535863
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Knut Anders Hatlen commented on DERBY-3117:
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I don't think we should disallow building Derby with newer JDKs. I like the 
flexibility we get from saying that we require the ant process to use JDK 5 or 
higher, since that means I know that if I use the most recent JDK as system 
default and have ant.properties correctly set up, it'll just work when I type 
'ant'. If we require exact version, that means I need to write scripts to 
change the environment when I move between different projects.

Let me suggest a slightly different approach. What about changing the check in 
the build script so that it uses java15compile.classpath and tries to compile a 
file which uses JDK 6 features? Then we would detect if someone had mistakenly 
set the compile classpath to Java 6. Is that foolproof enough? :)

> Adjust master build script to require the Java 5 compiler to build Derby
> ------------------------------------------------------------------------
>
>                 Key: DERBY-3117
>                 URL: https://issues.apache.org/jira/browse/DERBY-3117
>             Project: Derby
>          Issue Type: Improvement
>          Components: Build tools
>    Affects Versions: 10.4.0.0
>            Reporter: Rick Hillegas
>            Assignee: Rick Hillegas
>         Attachments: derby-3117-01-enforceJava5-aa.diff, 
> derby-3117-01-enforceJava5-ab.diff, derby-3117-01-enforceJava5-ac.diff, 
> derby-3117-02-website-aa.diff, derby_source.html
>
>
> Require the Java 5 compiler in order to build Derby as approved by the 
> community recently: 
> http://www.nabble.com/-VOTE--Require-Java-5-%28or-later%29-compiler-to-build-Derby-tf4522491.html#a13030783

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