[GROOVY-5272] Intermittant/random incorrect resolution of sub-interface constant values

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.8.5
• Fix Version/s: 1.8.6, 2.0-beta-3
• Component/s: groovy-jdk
• Environment: Windows XP and LINUX
• Assignee: Cédric Champeau
• Reporter: Stephen Summerfield
• Created: 31/Jan/12 07:54
• Updated: 13/May/12 03:30
• Resolved: 13/Feb/12 03:27

Description

If a constant in a sub-interface replaces/shadows a constant in a super interface (both Java), when trying to access the sub-interface's constant value from Groovy, the behaviour is intermittantly incorrect - sometimes the sub-interface's value is returned (correct) and sometimes the super interface's value is returned (incorrect).
In Java the sub-interface's value is always returned, as expected.

See source code below that demonstrates this: InterfaceA.java, InterfaceB.java, ShowBugGroovy.groovy, ShowBugJava.java
If ShowBugGroovy is repeatedly run, sometimes the assertion fails, sometimes it passes (randomly?). I believe the behaviour is the same for concrete implementations of the sub-interface.

package groovybug;

public interface InterfaceA {
    String FOO="Foo A";
}

package groovybug;

public interface InterfaceB extends InterfaceA {
    String FOO="Foo B";
}

package groovybug

class ShowBugGroovy {
    static main(args) {
        println("Interface A: " + InterfaceA.FOO);
        println("Interface B: " + InterfaceB.FOO);

        // Fails randomly
        assert(InterfaceA.FOO!=InterfaceB.FOO)
    }
}

package groovybug;

public class ShowBugJava {
    public static void main(String[] args) {
        System.out.println("Interface A: " + InterfaceA.FOO);
        System.out.println("Interface B: " + InterfaceB.FOO);

        // Always passes
        assert(!InterfaceA.FOO.equals(InterfaceB.FOO));
    }
}

Issue Links

• is related to: GROOVY-5335 Constants defined in sub-interfaces which hide super-interface constants evaluate unpredictably