FULL PRODUCT VERSION :


A DESCRIPTION OF THE PROBLEM :
    public static <T extends List> T newList() {
        return null;
    }

    public static void main(String[] args) {
        String s = newList();
    }
following code works fine while it should not compile.

         0: invokestatic #4 // Method newList:()Ljava/util/List;
         3: checkcast #5 // class java/lang/String
 the type is inferred correctly but the assignment of a List to String is permitted.

Only happens to interfaces. changing to a concrete class no longer compiles.

REGRESSION. Last worked in version 6u45


REPRODUCIBILITY :
This bug can be reproduced always.