[GROOVY-8051] Reference outer class property within inner class closure

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.4.7, 2.4.8
• Component/s: Compiler, Static compilation, Static Type Checker
• Assignee: Eric Milles
• Reporter: Daniil Ovchinnikov
• Created: 13/Jan/17 15:56
• Updated: 08/Mar/22 12:16
• Resolved: 18/Nov/21 17:31

Description

@CompileStatic // works without this @CompileStatic
class Outer {
  def foo = 1
  Inner createInner() { new Inner() }
  class Inner {
    Closure createClosure() {
      return { foo }
    }
  }
}

@CompileStatic
class Main {
  static void main(String[] args) {
    def i = new Outer().createInner()
    def cl = i.createClosure()
    println cl()
  }
}

Fail in runtime with:

Exception in thread "main" org.codehaus.groovy.runtime.typehandling.GroovyCastException: 
Cannot cast object 'Outer$Inner@23e028a9' with class 'Outer$Inner' to class 'Outer'
	at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.continueCastOnSAM(DefaultTypeTransformation.java:405)
	at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.continueCastOnNumber(DefaultTypeTransformation.java:319)
	at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.castToType(DefaultTypeTransformation.java:232)
	at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.castToType(ScriptBytecodeAdapter.java:603)
	at Outer$Inner$_createClosure_closure1.doCall(innerclassestest.groovy)
	at Outer$Inner$_createClosure_closure1.call(innerclassestest.groovy)
	at Main.main(innerclassestest.groovy:23)

Issue Links

• is related to: GROOVY-8050 Reference outer class property via inner class