While debugging multi-threaded code in intellij, and more specifically while stepping inside a thread...
Setup:
@Override
public
void run() {
while (true) {
System.err.println("1" + get()); <-- breakpoint
System.err.println("2" + get());
System.err.println("3" + get());
}
}
public String get() {
return "x";
}
I have 6 threads, all running the code above.
Intellij keeps changing the current thread that I'm in, meaning that when I issue a "Step over" (F8) command for T1, the debugger will change focus to T2. What I'm expecting is to stay in T1 while I'm debugging -- so to produce the result:
T1: 1x
T1: 2x
T1: 3x
T1: 1x
T1: 2x
Then, let's switch to another thread, T2.
T2: 1x
T2: 2x
T2: 3x
T2: 1x
T2: 2x
T2: 3x
Then, back to T1:
T1: 3x (it picks back up from where it left off)
Instead, what I'm getting is:
T1: 1x
T3: 1x
T5: 1x
T1: 2x
T2: 1x
T3: 2x
T1: 3x
etc.
It's out-of-order, and not at all intuitive.
If I want to have my intended behavior, I have to do the following:
Switch to T1:
T1: 1x
Switch to T1:
T1: 2x
Switch to T1:
T1: 3x
Switch to T2:
T2: 1x
Switch to T2:
T2: 2x
Switch to T2:
T2: 3x
Switch to T1:
T1: 1x
etc...
I've searched for a way to prevent this, and I've not found a solution, and the only way that I've discovered (to maintain stepping in my current thread), is to keep selecting it with the mouse every time I step.
The question is: how do I do prevent intellij changing the thread I'm on?
edit: I should point out, that if any methods are called, thread execution order is out-of-order.
