Re: Continuously re-spawning a stopped/killed thread

*[Today while checking the mailing-list archives to share the link of my
question with a friend, I noticed Martin Buchholz's response, which I could
find neither in my inbox, nor in spam folders. Maybe missed during the
recent Google outage?]*

On Tue Dec 15 15:44:21 EST 2020 Martin Buchholz wrote:
> Why not just try { ... } catch (...) { handle ... } in your thread's main
method?

That is what I had in mind initially:

try { delegate(); }
catch (ThreadDeath ...) { ... }
catch (Throwable ...) { ... }

But is this it? These sort of blacklists always make me nervous. I did not
know about ThreadDeath until a user complaint. Maybe there are more such
corner cases that I need to prevent against, hence my question to this list.


On Mon, Dec 14, 2020 at 11:24 AM Volkan Yazıcı <[email protected]>
wrote:

> Hello,
>
> In Log4j, we need to run a background task and keep it alive — unless JVM
> is stopped or our *while (!stopped)* condition fails after an interrupt.
> That is, if the task fails for some reason (e.g., by means of throwing an
> exception, interruption, or *ThreadDeath* due to *Thread#stop()*), it
> needs to be re-spawned. What is the most robust/decent way to implement
> this?
>
> For the records, this is the problem I am dealing with in Log4j:
> https://github.com/apache/logging-log4j2/commit/56436ad2176eac000d2821690e4373f097b76670#r44892412
>
> In a nutshell, we have a wrapper running in the background that calls
> Log4j *Layout*s to render *LogEvent*s. Though certain layouts can do
> really strange things from calling *Thread.currentThread().stop()* to
> throwing an *Error*. These cause the wrapper thread to get killed.
>
> I have found work arounds using uncaught exception handlers
> <https://howtodoinjava.com/java/multi-threading/restart-thread-uncaughtexceptionhandler/>,
> though I couldn't be sure if this is the right way to do it.
>
> Kind regards.
>

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