I am using NetBeans 7.2 and Java 1.7.0_07 on Windows XP. Netbeans keeps bothering me to change my existing diamond operators to be empty, example:

existing code: List<Point2D> pointList = new ArrayList<Point2D>();
netbeans hint: List<Point2D> pointList = new ArrayList<>();

It removes the contents of the diamond operator. I know this is a clone of an existing bug that was closed, but the issue is happening again in my later version of netbeans/java se.

+++ This bug was initially created as a clone of Bug #200592 +++

Let's have a code block like the following one:

  final Callable<String> callable = new Callable<String>() {

            @Override
            public String call() throws Exception {
                return "test";
            }
        };

Hints suggest to use diamond inference, so above code would be changed to:

 final Callable<String> callable = new Callable<>() {

            @Override
            public String call() throws Exception {
                return "test";
            }
        };

But the lattest code will not compile, due to:

 error: cannot infer type arguments for Callable;
        final Callable<String> callable = new Callable<>() {
  reason: cannot use '<>' with anonymous inner classes