What went wrong:
Execution failed for task ‘:sdk:buildSdk’.
> The following error occurred while executing this line:
/home/vlad/Development/Java/jmonkeyengine/netbeans/harness/suite.xml:187: The following error occurred while executing this line:
/home/vlad/Development/Java/jmonkeyengine/netbeans/harness/common.xml:217: Compile failed; see the compiler error output for details.
Here you may find the result of ./gradlew build --stacktrace.
If there is anything else I can help you with please ask.