#548 default method in generic interface

[Adam Bartoszewicz]

Applies to version 5.1
I reported my problem in https://sourceforge.net/p/proguard/bugs/537/#62a5. I tested it with new ProGuard 5.1 and it seems, that the bug still exists.

Java 1.8.20, Win7.
I override default method in generic interface. ProGuard removes call of that method.

public class J8ProGuardGenerics {
    public static void main(String[] args) {
        Interface1 o = new J8PG();

        System.out.println("before setObjectValue");

        //--- this line is not excecuted after obfuscation 
        //--- workaround: -dontshrink 
        o.setObjectValue("setObjectValue");

        System.out.println("after setObjectValue");
    }

    public static interface Interface1 {
        public void setObjectValue(Object value);
    }

    public static interface Interface2<Type> extends Interface1 {
        void setValue(Type value);
        @SuppressWarnings("unchecked")
        default public void setObjectValue(Object value) {
            setValue((Type)value);
        }
    }

    public static class J8PG implements Interface2<String> {
        @Override
        public void setValue(String value) {
            System.out.println(value);
        }
    }
}

Output without obfuscation:

before setObjectValue
setObjectValue
after setObjectValue

Output with obfuscation:

before setObjectValue
after setObjectValue

Regards
Adam

[Eric Lafortune]

Thanks for your report. This bug has been solved in ProGuard 5.2 beta1.

[Adam Bartoszewicz]

I confirm bug is fixed. Thanks for your great work.