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From "Robert Scholte (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MCOMPILER-270) Support release=8 on JDK 9 (with fallback on source=8 and target=8 on JDK 8)
Date Wed, 15 Jun 2016 17:05:09 GMT

    [ https://issues.apache.org/jira/browse/MCOMPILER-270?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15332104#comment-15332104
] 

Robert Scholte commented on MCOMPILER-270:
------------------------------------------

Preprerations already done at [plexus-compiler|https://github.com/codehaus-plexus/plexus-compiler/commit/28bae71d3ed41db33bb28f1a5f8f6201525a71f2]
some time ago.
I'm not sure if we should automatically translate source/target to release. I know some projects
which use both Java6 and Java7 code and which depend on this 'feature'. And yes, I am aware
of multirelease jars, but will require a Maven multimodule project. I'd say too early for
now.

> 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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