Geoffrey De Smet created MCOMPILER-270:
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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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