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https://issues.apache.org/jira/browse/DERBY-3117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12538525
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Knut Anders Hatlen commented on DERBY-3117:
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Rick, do we need to check vendor? If people want such fine-grained control, 
they could use ant.properties instead. For people who only want to compile 
Derby, using the first JDK/SDK we find would probably suffice. Note that 
setting compile.classpath does not change which compiler we use, only which 
libraries the compiler uses to check that the methods/classes we use exist. So 
the compiled byte code will look identical regardless of which vendor's class 
library we use. The compiler only changes when we change JAVA_HOME.

> 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: BuildDefaults.txt, 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-3117-03-junit-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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