[GROOVY-8265] If CompileStatic is used, metaClass variable shadowing triggers exception when invoking closures

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.4.12
• Component/s: groovy-runtime, Static compilation
• Assignee: Unassigned
• Reporter: Sergio Nalin
• Created: 19/Jul/17 13:36
• Updated: 01/Jun/24 16:45
• Resolved: 01/Jun/24 16:45

Description

See the small attached example class.

Problem arises if you define a local variable and name it "metaClass", then call a closure that accepts some parameters like map.each

{ key, value -> ... }

.

When the code gets to Closure.call(Object... args) it executes:

return (V) getMetaClass().invokeMethod(this,"doCall",args);

only now getMetaClass() returns the shadowed metaClass variable, not the Closure's metaClass and an exception is thrown if the class that the external metaClass belongs to does not define a doCall(args) method.

This seems to be happening only with @CompileStatic

Renaming the local variable from metaClass to anything else works around the problem.