Scheduled runnable ended with an exception


I’m getting the following exception in my openhab.log. Maybe I’m not seeing the forest for all the trees, but I have no idea which Thing, Item, Link or Rule it is causing it. I can see it’s linked to a KNX Thing, but I have no idea which …

2022-04-06 19:57:05.486 [WARN ] [mmon.WrappedScheduledExecutorService] - Scheduled runnable ended with an exception: 
java.lang.NullPointerException: null
	at ~[?:?]
	at ~[?:?]
	at ~[?:?]
	at org.openhab.binding.knx.internal.client.AbstractKNXClient.sendToKNX( ~[?:?]
	at org.openhab.binding.knx.internal.client.AbstractKNXClient.respondToKNX( ~[?:?]
	at org.openhab.binding.knx.internal.handler.DeviceThingHandler.lambda$8( ~[?:?]
	at org.openhab.binding.knx.internal.handler.DeviceThingHandler.withKNXType( ~[?:?]
	at org.openhab.binding.knx.internal.handler.DeviceThingHandler.sendGroupValueResponse( ~[?:?]
	at org.openhab.binding.knx.internal.handler.DeviceThingHandler.lambda$10( ~[?:?]
	at org.openhab.binding.knx.internal.handler.DeviceThingHandler.withKNXType( ~[?:?]
	at org.openhab.binding.knx.internal.handler.DeviceThingHandler.onGroupRead( ~[?:?]
	at org.openhab.binding.knx.internal.client.AbstractKNXClient$1.lambda$1( ~[?:?]
	at org.openhab.binding.knx.internal.client.AbstractKNXClient.lambda$8( ~[?:?]
	at java.util.concurrent.Executors$ ~[?:?]
	at ~[?:?]
	at java.util.concurrent.ScheduledThreadPoolExecutor$ ~[?:?]
	at java.util.concurrent.ThreadPoolExecutor.runWorker( [?:?]
	at java.util.concurrent.ThreadPoolExecutor$ [?:?]
	at [?:?]

Can anybody help to steer me in the right direction?

When do you see this error? Only during startup, at a specific time(s) of day, randomly, etc.?

The root of the exception is coming from a third party library used by the KNX binding and it looks like it’s trying to respond to some sort of message from KNX and it’s failing with a NPE on the send.

I don’t know much about KNX but I wouldn’t think there is anything in your KNX Thing configuration that could cause this. If it persists I’d recommend creating an issue on the openhab-addons repo.


I am experiencing exactly the same issue (same message). The message is repeated almost exactly every 15 minutes. The binding keeps working properly however.
openHAB 3.2.0
Windows 10