Unexpected error during iFL initialization: Duplicated key definit

[Frenkymd]

If certain types of methods exist in the analysed project, then the initialization of the iFL session fails with an unexpected error and exception.

Steps

1. Select a project.
2. Start an iFL session using any of the available options (icon, menu or key shortcut).

Expected behavior Given the following code:

package test;

import java.util.Collection;

public class Bar {

    public static <T> T foo(T arg) {
        return arg;
    }

    public static <T extends CharSequence> T foo(T arg) {
        return arg;
    }

    public static <T extends Collection<?>> T foo(T arg) {
        return arg;
    }

}

The plugin should recognize the method erasures correctly. The expected list of methods is (in accordance with the naming scheme used in Java byte-code):

• test.Bar.foo(Ljava/lang/Object;)Ljava/lang/Object;
• test.Bar.foo(Ljava/lang/CharSequence;)Ljava/lang/CharSequence;
• test.Bar.foo(Ljava/util/Collection;)Ljava/util/Collection;

However, all methods are recognized as test.Bar.foo(TT;)TT; and hence iFL is not able to distinguish them.

The upper bounds of the generic types are just for the sake of the example. The behavior should not/does not change if other types are used.

Screenshots

Environment:

• Package: https://github.com/sed-szeged/iFL4Eclipse/releases/tag/V2.fix-feedback-dialog-bugs
• Operating System: Windows 10 Pro, 64 bit
• Eclipse version: 2020-06 R (4.16.0)

Additional context

• exception.txt

Workaround: After method binding the correct method signatures are available, therefore a possible solution is to replace/extend the getSignature method with the following code:

Field bindingField = method.getClass().getDeclaredField("binding");
bindingField.setAccessible(true);

Object binding = bindingField.get(method);

Field signatureField = binding.getClass().getDeclaredField("signature");
signatureField.setAccessible(true);

String paramsAndReturn = new String((char[]) signatureField.get(binding));