What does “no method return value” mean in Eclipse Debug perspective?

Question

Placing a breakpoint in a method which is run by multiple threads, I encountered for the first time a \"no method return value\" Name in the Variables tab:

Answer 1

The return value is displayed when you step over the end of a non-void method.

For example, when the debugger stops at a breakpoint there is no method return value:

but when you step over the end of the method via Step Return (F7) or at the end of a method via Step Over (F6), the method return value is shown: