[GROOVY-7185] Impossible to override method with generic array of Java class.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.2.2, 2.3.8, 2.4.6
• Fix Version/s: 2.4.8
• Component/s: Compiler
• Labels: compiler generics java
• Environment: groovy 2.2.2 (tried with 2.3.8); java openjdk 1.7.0_65; ; maven 3.2.2; maven-compiler-plugin 3.1; groovy-eclipse-compiler 2.8.0-01; groovy-eclipse-batch 2.1.5-03
• Assignee: Shil Sinha
• Reporter: Andrey Beletsky
• Created: 27/Nov/14 03:29
• Updated: 01/Feb/17 23:19
• Resolved: 04/Jun/16 20:32

Description

Java classes:

public interface A<T> {
    T[] process();
}

public class B implements A<String> {
    @Override
    public String[] process() {
        return new String[0];
    }
}

Groovy class:

class C extends B {
    @Override
    String[] process() {
        return super.process()
    }
}

I've got following error during compilation:

Groovy:The return type of [Ljava.lang.String; process() in temp.C is incompatible with [Ljava.lang.Object; process() in temp.B

BTW, I can't convert classes A and B to Groovy because it's library's classes (not mine).

Issue Links

• is duplicated by: GROOVY-7849 Incompatible covariant array return type