lambda bugs - trouble with `this` in lambda body in default method

[Stuart Marks]

Nice bugs! These reproduce on b106, which was recently released as the 
official JDK 8 Developer Preview build.

Well, more precisely, the first example still crashes, and the second 
example crashes at runtime with a VerifyError instead of printing 
"null". Still a bug though obviously.

I've filed a bug which should eventually appear here:

http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8024497

Thanks,

s'marks


On 9/6/13 8:07 PM, Zhong Yu wrote:
> This code crashes javac (jdk8 ea build 105)
>
> public interface Foo
> {
>      default Runnable getAction()
>      {
>          return ()->{
>              System.out.println(this);
>          };
>      }
> }
>
> Insert a random line, the code compiles; but at runtime, `this`
> evaluates to null
>
> public interface Foo
> {
>      default Runnable getAction()
>      {
>          return ()->{
>              int x = 0; // a random line
>              System.out.println(this);  // prints "null"
>          };
>      }
>
>      public static void main(String[] args)
>      {
>          Foo foo = new Foo(){};
>          foo.getAction().run();
>      }
> }
>
>
> Zhong Yu
>