Different java versions for mvnd and maven

[gandadil]

I am trying to compile a Java 7 source with mvnd but it's not supported. If there is any way to set different JAVA_HOME for mvnd and internal maven I can run mvnd with Java 11 for example and maven with Java 7. Is it possible?
I tried set java.home with Java 11 on mvnd.properties and JAVA_HOME with Java 7 but doesn't work.

[khmarbaise]

You can use JDK11 runtime for all and set the --release 7 which produces JDK7 compatible code. mvnd itself needs at minimum JDK8 to run...

[gandadil]

mvnd --release 7 -f pom.xml clean install -U -Dmaven.test.failure.ignore=true dependency:copy-dependencies -Dparallel=all -DperCoreThreadCount=true -DthreadCount=2 -DforkCount=2C

Unable to parse command line options: Unrecognized option: --release

[khmarbaise]

This means you are running with JDK8 or less...that does not work. The `--release´ is available from JDK9+ As I said run your build with JDK11 and use the --release option..

Is there a reason why you are using copy-dependencies etc. ? Why ignoring test failures? And fork count?

[gnodet]

Reopen if needed.

[gandadil]

Well, I am using Semeru distribuition of Adoptium OpenJDK 11 and is receiving this message. Maybe I need to use a distribution with Hotspot JVM instead OpenJ9?

[gnodet]

The --release 7 is a java compiler option, not a mvnd option. This option needs to be configured on the maven compiler plugin. Also make sure your JAVA_HOME environment variable points to a JDK that does support java 7.

[gandadil]

Thank you for your help. I put -Dmaven.compiler.release=7 and works.