Allow Quarkus to pick a random debug port

[geoand]

By passing a zero or negative value, Quarkus
will launch the dev-mode JVM process
using a random debugging port

Relates to: #33363

[geoand]

As a follow-up, we could potentially force the use of a different port if the configured port is already taken.

[iocanel]

Given that in the ServerSocket port 0 is the number that we use to pick the first available port. I would do the same here.
Of course expanding this to negative is possibly also fine. Sooo... yeah!

[geoand]

Yeah, I think it's pretty benign to do the same for negative numbers

[quarkus-bot]

Failing Jobs - Building 70e8b6a

Status	Name	Step	Failures	Logs	Raw logs
✔️	JVM Tests - JDK 11
✔️	JVM Tests - JDK 17
⌛	JVM Tests - JDK 17 Windows	Build	⚠️ Check →	Logs	Raw logs
✔️	JVM Tests - JDK 19
✔️	Maven Tests - JDK 11
⌛	Maven Tests - JDK 11 Windows	Build	⚠️ Check →	Logs	Raw logs

[geoand]

@maxandersen okay to merge?

[maxandersen]

Yeah +1 though I'm mainly after having stable port used and then choose randomly if blocked.

Then one can start multiple quarkus dev and use discovery attach in IDEs that supports it.

[maxandersen]

Actually. Wait a sec. Need to test something first.

[geoand]

Yeah +1 though I'm mainly after having stable port used and then choose randomly if blocked.

I can do that too after this one

[maxandersen]

okey so here is what I was investigating - how intellij actually behave today. if you start two quarkus-dev listening on differeth http ports you end up with this view:

note, one of those failed to listen and thus you can't know which is the right one if you are running multiple of the same app (different ones will have different path).

if you set explicit ports you get this:

now you can actually differentiate.

Thus on its own this PR is of less use since if I need to set the -Ddebug value I would just set them explicitly as I did in the above.

so +1 on merging this but we really should be looking at getting dev mode by default to grab random debug port if requested is not available so you are always able to debug your quarkus dev mode.

[geoand]

we really should be looking at getting dev mode by default to grab random debug port if requested is not available so you are always able to debug your quarkus dev mode

Sure yeah, I'll have a look tomorrow