Bug 578410

Description Martin Fabricius 2022-01-27 15:02:13 EST

Consider the following MWE

public class NonAmbiguousVarargs {

    static void method(int... array) {
        System.out.println("int array");
    }

    static <T> void method(T... array) {
        System.out.println("Object array");
    }

    public static void main(String[] args) {
    	method(1);
    }
}

While eclipsec compiles this code without problems, bindind the call to method to the (int...) overload, javac fails with the following error message

NonAmbiguousVarargs.java:12: error: reference to method is ambiguous
        method(1);
        ^
  both method method(int...) in NonAmbiguousVarargs and method <T>method(T...) in NonAmbiguousVarargs match
  where T is a type-variable:
    T extends Object declared in method <T>method(T...)
1 error

Assuming the behaviour of the javac is correct according to the Java language specification (the code does only compile in JDK 1.5 and 1.6; JDK 1.7 - 18 give the above error) then eclipsec should also give an error on this line.

Tested with
Eclipse SDK
Version: 2022-03 (4.23)
Build id: I20220126-1800

java version "1.5.0_22"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_22-b03)
Java HotSpot(TM) 64-Bit Server VM (build 1.5.0_22-b03, mixed mode)

java version "1.6.0_45"
Java(TM) SE Runtime Environment (build 1.6.0_45-b06)
Java HotSpot(TM) 64-Bit Server VM (build 20.45-b01, mixed mode)

openjdk version "1.7.0_75"
OpenJDK Runtime Environment (build 1.7.0_75-b13)
OpenJDK Client VM (build 24.75-b04, mixed mode)

... some other versions in between ...

openjdk 18-ea 2022-03-15
OpenJDK Runtime Environment (build 18-ea+23-1525)
OpenJDK 64-Bit Server VM (build 18-ea+23-1525, mixed mode, sharing)