[Wrong JAVA_HOME despite right path being set]

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[Wrong JAVA_HOME despite right path being set]

I'm unable to run setupDecompWorkspace in Debian 9.

 

Execution failed for task ':recompileMc'.
> Unable to find a javac compiler;
  com.sun.tools.javac.Main is not on the classpath.
  Perhaps JAVA_HOME does not point to the JDK.
  It is currently set to "/usr/lib/jvm/java-8-openjdk-amd64/jre"

 

Echo returns the right path (no /jre):

 

echo $JAVA_HOME
/usr/lib/jvm/java-8-openjdk-amd64

 

 

Is gradle overriding this somewhere? How can I fix it? Thanks in advance