Breakpoint in `finally` not being hit

Question

I was messing around with some try...catch...finally executions and noticed a breakpoint in finally won't seem to be hit:

    try {
        System.out.println("in try");
        int num = 5 / 0;
    } catch (ArithmeticException e) {
        System.out.println("in catch");
    } finally {
        System.out.println(); //breakpoint here
        System.out.println("in finally");
    }

The breakpoint in the finally doesn't seem to hit, however it prints out successfully.

However, if I change the try to int num = 5 / 1;, and therefore not going in to the catch, the breakpoint is hit.

I'm using Netbeans 8.1.

Is there a reason for this?

@Shark `System.out.println();` doesn't print nothing. It prints a newline. — khelwood, Dec 20 '18 at 11:57
@Shark no it won’t hit the line after, I added the two lines to test both just in case. — achAmháin, Dec 20 '18 at 11:57
if clean/refresh will not help you can decompile the code to see what is going on — Eugen, Dec 20 '18 at 12:00
may be issue with env/IDE, I'm able to do the same on my env. — NPE, Dec 20 '18 at 12:00
`exampleMethod()` and `exampleMethod2()` invoke each other infinitely. Are you sure neither of these methods is being called anywhere? Can you for testing remove the call to `exampleMethod2()` withing exampleMethod and see if finally is still not reached? — kscherrer, Dec 20 '18 at 12:01
@Hulk it’s Netbeans but I’ll try eclipse and/or IntelliJ shortly when I get a chance. — achAmháin, Dec 20 '18 at 12:09
@Hulk *Does it get hit if there is no exception?* - good point - and yes it does hit so I've updated the question. — achAmháin, Dec 20 '18 at 12:47

Ricard Kollcaku · Answer 1 · 2018-12-20T12:02:47.830

0

is happening because in catch you are infinitely looping throw functions if you see your code

exampleMethod() is calling exampleMethod2() and exampleMethod2() calling exampleMethod() so you have a loop with function thats why you get StackoverFlowError

try to functions not call itself

    public static void main(String[] args) {
    SpringApplication.run(AuthApplication.class, args);
    try {
        System.out.println("in try");
        int num = 5 / 0;
    } catch (ArithmeticException e) {
        System.out.println("in catch");
        exampleMethod();
    } finally {
        System.out.println(); // <--- breakpoint here
        System.out.println("in finally");
    }
}

static void exampleMethod() {

}

in this example brakepoint hit in finally

edited Dec 20 '18 at 12:02

answered Dec 20 '18 at 12:00

Ricard Kollcaku

1,622
5
9

If you see the end of the post - the same problem is present without any call to the example methods. – achAmháin Dec 20 '18 at 12:01
OP knows that. `finally` will still be executed (after the `StackOverflowError` is thrown). – Hulk Dec 20 '18 at 12:02
@achAmháin the method could be invoked from somewhere else? – kscherrer Dec 20 '18 at 12:02
@achAmháin maybe you have some problems with editor because i tried and it hit the brake-point – Ricard Kollcaku Dec 20 '18 at 12:04
I will try with other IDEs when I’m back on my machine shortly. – achAmháin Dec 20 '18 at 12:06

aBnormaLz · Answer 2 · 2018-12-20T12:12:54.087

0

According to this answer finally is skipped because the infinite recursion (also this question might be a duplicate of that)

Or if not i think you should recompile the whole project. So even if you delete that function call, maybe the compiled classes still have that infinite recursion.

EDIT

Here is the proof that it works. So please try to recompile it, delete caches, etc, or please give us a bit more description about the exact problem.

edited Dec 20 '18 at 12:12

answered Dec 20 '18 at 12:09

aBnormaLz

809
6
22

1

As I commented below the other answer, I tried without the exception and the same result applies. – achAmháin Dec 20 '18 at 12:10
There is no infinite loop. There is "infinfite recursion", but this is actually quite finite (due to stack overflow) – Hulk Dec 20 '18 at 12:12
Edited my answer, and yes @Hulk you are right, that is an infinite recursion, not loop, thanks for pointing that out :) – aBnormaLz Dec 20 '18 at 12:13

Breakpoint in `finally` not being hit

2 Answers2