Eclipse breakpoint in single / one line lambda?

How can I set a breakpoint in a single line lambda?

e.g. I’d like the (eclipse) debugger to halt, when outer.doSth(event) is called:

observable.addCallback(event-> outer.doSth(event));


You can’t.

If you refactor it like this:

observable.addCallback(event-> {
    return outer.doSth(event);

you can.

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