JDK-8162946 : Casting 'this' from anonymous class to arbitrary interface succeeds
  • Type: Bug
  • Component: tools
  • Sub-Component: javac
  • Affected Version: 9
  • Priority: P2
  • Status: Resolved
  • Resolution: Not an Issue
  • Submitted: 2016-08-02
  • Updated: 2016-08-31
  • Resolved: 2016-08-31
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JDK 9
9Resolved
Related Reports
Relates :  
JDK-8161013 - Never treat anonymous classes as 'final'
Relates :  
JDK-8161009 - 15.9.5: Anonymous classes aren't actually 'final'
Description
Let's consider following code:

interface I {}

class Test {
    void foo() {
        new Object() {
            I bar() {
                return (I)this;
            }
        };
    }
}

This code compiles successfully by javac from JDK build 128. However compilation should fail on 'return (I)this;' because the anonymous class doesn't have any relation to interface I.
Comments
Per JDK-8161009, this is correct behavior.
31-08-2016
this regression was provoked by JDK-8161013
10-08-2016