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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} -- This message was sent by Atlassian JIRA (v6.3.4#6332)