[GROOVY-6067] MetaClassImpl triggers new entries for maps with default

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.8.9, 2.1.2
• Fix Version/s: 2.4.6
• Component/s: groovy-jdk
• Assignee: Pascal Schumacher
• Reporter: Cédric Champeau
• Created: 22/Mar/13 10:30
• Updated: 22/Feb/16 20:48
• Resolved: 15/Nov/15 10:53

Description

The following code:

def map = [:].withDefault { 'foo' }
Map.metaClass.bar = { -> 'ok' }
assert map.bar() == 'ok'
assert !map.containsKey('bar')

println map.keySet()

Fails at the second assertion, because MetaClassImpl triggers an unexpected get() into the map.

Note that the behaviour is not the same if you use a per instance MC, which probably means inconsistencies...