Java error jupnp at openhab startup

Setup, Configuration and Use Installation
1
  • Platform information:
    • Hardware: Raspnerry Pi 2
    • OS: CentOS 7
    • Java Runtime Environment: zulu latest
    • openHAB version: 2.3.0

Hi,
after every startup of the openhab service i have following errors in openhab.log:

2018-10-06 00:48:11.033 [ERROR] [.jupnp.transport.impl.DatagramIOImpl] - Exception sending datagram to: /239.255.255.250: java.io.IOException: Operation not permitted (sendto failed)
java.io.IOException: Operation not permitted (sendto failed)
at java.net.PlainDatagramSocketImpl.send(Native Method) ~[?:?]
at java.net.DatagramSocket.send(DatagramSocket.java:693) [?:?]
at org.jupnp.transport.impl.DatagramIOImpl.send(DatagramIOImpl.java:156) [173:org.jupnp:2.3.0]
at org.jupnp.transport.impl.DatagramIOImpl.send(DatagramIOImpl.java:149) [173:org.jupnp:2.3.0]
at org.jupnp.transport.RouterImpl.send(RouterImpl.java:300) [173:org.jupnp:2.3.0]
at org.jupnp.protocol.async.SendingSearch.execute(SendingSearch.java:90) [173:org.jupnp:2.3.0]
at org.jupnp.protocol.SendingAsync.run(SendingAsync.java:52) [173:org.jupnp:2.3.0]
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) [?:?]

Can anybody help to get this away?

2

what is the output of java -version ?

CentOS on rPi2? nice :slight_smile:

3

Jep CentOS :slight_smile:

Output is:

java -version
openjdk version “1.8.0_181”
OpenJDK Runtime Environment (Zulu 8.31.1.122-linux_aarch32hf) (build 1.8.0_181-b122)
OpenJDK Client VM (Zulu 8.31.1.122-linux_aarch32hf) (build 25.181-b122, mixed mode, Evaluation)

4

Ok… has to be with the use of multicast in openhab and active iptables
Can multicast be disabled in openhab? Otherwise i have to found some sufficient rules to pass the multicast traffic.

Maybe openhab should catch this exception and only print a single error/warn in log?

5

I observe the same problem for some time now (on Debian stretch amd64 with OpenJDK as well as with Zulu).

I also think that it’s a problem with iptables (I use firehol on the server), but didn’t find a way to work around this annoying error messages in the log.

@xoxys Did you find a iptables rule to get rid of the errors?

6

Did some more testing with this and found out, that in firehol the following two lines solve this issue, when added to every local interface:

   client4 all accept dst 224.0.0.22
   client4 upnp accept dst 239.255.255.250

The first line allows outgoing IGMP requests DST=224.0.0.22 PROTO=2, the second one allows outgoing UPNP DST=239.255.255.250 PROTO=udp DPT=1900.

With these two settings the list of errors in my openhab.log shrunk extremly and is now readable again.

7

@RoRo sorry for the late response. Yes i have implemented a “workaround” for this on my server but as i remember its more widely open as is should be :slight_smile:

I will have a look on my config if i am at home and post an update