[jira] [Created] (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>]

Geoffrey De Smet created MCOMPILER-270:
------------------------------------------

             Summary: 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, 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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