[GROOVY-4202] successive metaclass modification for class then instance fails.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.7.1
• Fix Version/s: 1.7.3, 1.8-beta-1
• Component/s: groovy-jdk
• Environment: groovy 1.7, jdk 1.6.20, win 7
• Assignee: Roshan Dawrani
• Reporter: Ryan Ovrevik
• Created: 12/May/10 13:06
• Updated: 23/Jun/10 15:45
• Resolved: 03/Jun/10 06:16

Description

define a groovy class (an empty class declaration will do).

class TestClass0 {}

Muck with the metaclass using the class and an instance. the second closure assignment throws an exception (java.lang.ClassCastException: groovy.lang.MetaClassImpl cannot be cast to groovy.lang.GroovyObject at org.codehaus.groovy.runtime.HandleMetaClass.replaceDelegate(HandleMetaClass.java:71)).

void testSomething1() {
def inst = new TestClass0();
TestClass0.metaClass.addedMethod0 =

{ return 'hello0'}

inst.metaClass.addedMethod1 =

{ return 'hello1'}

}

note that simply changing the order of the closure assignments executes without throwing exceptions.