Example rule: (I've added a complete Eclipse minimal maven project setup zipped as an attachment) //created on: 12.02.2021//created on: 12.02.2021package demo //list any import classes here.import demo.SomeClass;import demo.SomeOtherClass; rule "FailsCompilation"    when        $some : SomeClass( getText().equals("Irrelevant") )        $other : SomeOtherClass()    then       $some.getReferences().stream()        .forEach(s -> {        s.setText("AlsoIrrelevant");        }); $other.setText("YouguessedIt");end rule "OkCompilation"    when        $some : SomeClass( getText().equals("Irrelevant") )        $other : SomeOtherClass()    then    $other.setText("YouguessedIt");       $some.getReferences().stream()        .forEach(s -> {        s.setText("AlsoIrrelevant");        }); $other.setText("YouguessedIt2");end