[GROOVY-10241] Class Implementing Map Can't Read Fields From Within Closures

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Not A Bug
• Affects Version/s: 3.0.9
• Assignee: Unassigned
• Reporter: Ian
• Created: 17/Sep/21 14:35
• Updated: 03/Feb/22 22:49
• Resolved: 27/Sep/21 10:55

Description

If a class implements 'Map' or subclasses an implementation of 'Map' then closures can't read fields in that class. This code is in a script called 'map.groovy':

 

class A extends HashMap {
  @Override
  Object get(Object key) {
    return 'OtherString'
  }
}
class B extends A {
  String aa = 'TheString'    
  def foo() {
    println aa
    Closure c = {println aa}
    c.call()
  }
}
new B().foo()

$ groovy map.groovy 
TheString
OtherString

I expect to get "TheString" twice.

 

I see the same behavior with other implementations of 'Map' or when I implement 'Map' directly.

Curiously I was not able to get the same behavior when I created my own interface defining 'get()' and implementing that.