[GROOVY-8614] Invalid reference generated in InnerClasses attribute for nested interface

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.4.15
• Fix Version/s: 2.4.16, 2.5.1
• Component/s: class generator
• Assignee: John Wagenleitner
• Reporter: Tony Abbott
• Created: 29/May/18 07:44
• Updated: 26/Jul/18 04:38
• Resolved: 19/Jun/18 01:08

Description

Compiling a class with a nested interface results in a reference to a non-existent inner class "X$Y$1" in the InnerClasses attribute of the resultant class file. Nested classes and inner classes do not exhibit this problem, only nested interfaces.

Sample class that demonstrates the problem:

class X {
    interface Y {}
}

Examining the resultant class file:

$ javap -v -cp . X.class
...
SourceFile: "X.groovy"
InnerClasses:
     public #139= #138 of #2; //Y=class X$Y of class X
     static #142= #141 of #2; //1=class X$Y$1 of class X

There is a reference to "X$Y$1" which does not exist. This breaks some tools, for example JUnit 5 test discovery.

 

It looks to me like this is related to https://issues.apache.org/jira/browse/GROOVY-5082, being the same bug just manifesting for nested interfaces.

Issue Links

• links to: GitHub Pull Request #756