[jira] [Comment Edited] (MCOMPILER-270) Support release=8 on JDK 9 (with fallback on source=8 and target=8 on JDK 8)

["Geoffrey De Smet (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MCOMPILER-270?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15333276#comment-15333276 ] 

Geoffrey De Smet edited comment on MCOMPILER-270 at 6/16/16 7:25 AM:
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Great :)

Note: not translate source/target to release, but the other way around: translate release to source/target on older JDK's that doen't support release.


was (Author: ge0ffrey):
Great :)

Note: not translate source/target to release, but the other way around: translate release to source/target on older JDK's.

> Support release=8 on JDK 9 (with fallback on source=8 and target=8 on JDK 8)
> ----------------------------------------------------------------------------
>
>                 Key: MCOMPILER-270
>                 URL: https://issues.apache.org/jira/browse/MCOMPILER-270
>             Project: Maven Compiler Plugin
>          Issue Type: New Feature
>    Affects Versions: 3.5.1
>            Reporter: Geoffrey De Smet
>            Priority: Blocker
>
> JDK 9 now supports the the follow argument:
> {code}
> javac -release 7
> {code}
> This replaced both `-source 7` and `-target 7`. And it prevents from using methods introduced in JDK 9 or JDK 8 when compiling for 7 with JDK 9. So `-release 8` basically better in every way than `-source 7 -target 7`.
>   http://mail.openjdk.java.net/pipermail/jdk9-dev/2015-July/002414.html
> Support this in the maven-compiler plugin, something like:
> {code}
>         <plugin>
>           <artifactId>maven-compiler-plugin</artifactId>
>           <configuration>
>             <release>7</release>
>           </configuration>
>         </plugin>
> {code}
> When compiling with JDK 9, it should just do `javac -release 7`.
> When compiling with JDK 8 or lower, it should fallback to `javac -source 7 -target 7`, so it behaves exactly like:
> {code}
>         <plugin>
>           <artifactId>maven-compiler-plugin</artifactId>
>           <configuration>
>             <source>7</source>
>             <target>7</target>
>           </configuration>
>         </plugin>
> {code}



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