Hi,
installed 2.5M2 yesterday and after some initial difficulties it now runs smooth. I had to restart openHAB several times before most of the exceptions in the log disappeared. I have two remaining issues, maybe it is useful for someone else:
- To resolve exceptions by the org.openhab.core.ephemeris binding (still have to check out, what this is for) could only be resolved by creating services/ephemeris.cfg, as stated somewhere else on this forum :
dayset-school=Monday,Tuesday,Wednesday,Thursday,Friday
dayset-weekend=Saturday,Sunday
region=nw
Setting these parameters in PaperUI was not enough, but I prefer config files anyway. I could not find any documentation regarding valid region codes, so I am not really sure, what I configured 
- The KNX2 binding throws the following exception on every start, but it seems to work OK anyhow:
2019-08-12 00:41:25.572 [WARN ] [mmon.WrappedScheduledExecutorService] - Scheduled runnable ended with an exception:
java.lang.NullPointerException: null
at org.openhab.binding.knx.internal.client.AbstractKNXClient.readNextQueuedDatapoint(AbstractKNXClient.java:283) ~[?:?]
at org.openhab.binding.knx.internal.client.AbstractKNXClient.lambda$1(AbstractKNXClient.java:199) ~[?:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:?]
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) ~[?:?]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) ~[?:?]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) ~[?:?]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:?]
at java.lang.Thread.run(Thread.java:748) [?:?]
Juelicher