Do something on crash.

Wondering, how would I execute some code when/if a server crashes?

 

Runtime.getRuntime().addShutdownHook(Thread hook)

that will be called when the java virtual machine shuts down.
BUT you cant call any bukkit code it has to be pure java that's only on the thread you pass in.

 

Thanks

 

not 100% sure it will fire in a crash tho...

 

If the jvm crashes it wont work too... ( OutOfMemory etc... )

davejavu
If you cant catch it ( by try/catch ) you wont be able to catch it with java.

So it is your work to write code well so it won't fail and cause jvm crashes. But i dont think the jvm will fail after nearly 20 years of production-level JREs and when its very rare.

If it should happen you can write a daemon/cron / or any restart thread which will listen for this process ( it needs to be in a OS native language/script / no java ) - to restart your server.

There are flags which can be set before starting get informations about a core dump etc.... like -XX:HeapDumpPath=/path/to/it & -XX:+HeapDump

So this may cause crashes:

- Native code ( JNI )
- JDBC
- OutOfMemory etc..
- Optimaztion / Performance Packs / Tools
- Libraries of the JVM itself could crash
- Threads which will have a to high threshold of using the cpu

I often heard of crashes with -Djava.library.path using wrong libs ( native libs )

If you want to get information from coredump files you can use:
Windows ( iam not sure if there where changes because i dont use it since 4 years ): DrWatson32.exe // or something like that
Linux: pmap / isstack
Mac: idk

I hope this helps. Ask again if you need more information.

 

thanks for the info!