Multiple sharedInformer creation: NullPointerException while running

[akram]

While migrating a project that uses many watchers for different object types to shared informers, I am facing the following error after informers get started:

2021-04-09 08:48:43 WARNING io.fabric8.kubernetes.client.informers.cache.Controller run Reflector list-watching job exiting because the thread-pool is shutting down
java.util.concurrent.RejectedExecutionException: Error while starting ReflectorRunnable watch
	at io.fabric8.kubernetes.client.informers.cache.Reflector.listAndWatch(Reflector.java:87)
	at io.fabric8.kubernetes.client.informers.cache.Controller.run(Controller.java:109)
	at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.NullPointerException

I tried to reuse the sharedInformer or have different ones, but in both cases, I see this exception happening around 60 times for a total of 120 created informers.

[hanikesn]

This is related to #2753 / #2754

[rohanKanojia]

@hanikesn : Could you please elaborate? How is it related to these?

[hanikesn]

@hanikesn : Could you please elaborate? How is it related to these?

Sorry, they only seem related on the first look.

[akram]

fixed by: #3019