Socket Closed when stop()

[KeithLaiKB]

when I try to test the example
java-coap/coap-core/src/test/java/protocolTests/ClientServerTest.java
(https://github.com/PelionIoT/java-coap/blob/master/coap-core/src/test/java/protocolTests/ClientServerTest.java)

case:
when server.stop() or client.stop(), the console would show "java.net.SocketException: socket closed"

process:
when I traced this process, I found it sources from DatagramSocketTransport.stop() method and LOGGER.error(e.getMessage(), e); in the method, the code line about "TransportExecutors.shutdown(readingWorker);" in this method couldn't run.

Should we deal with it or need to ignore it.

[KeithLaiKB]

when I tried to change the "Socket closed" to "socket closed" in com.mbed.coap.transport.udp.DatagramSocketTransport, it seems that it could solve this problem, but I don't know whether this change is what the contributor want.

source:
com.mbed.coap.transport.udp.DatagramSocketTransport

if (!ex.getMessage().startsWith("Socket closed")) {
LOGGER.warn(ex.getMessage(), ex);
}

[szysas]

Hi @KeithLaiKB,

How about checking against "ocket closed"? This was we would cover both cases.
Please feel free to make PR.

[KeithLaiKB]

Hi @KeithLaiKB,

How about checking against "ocket closed"? This was we would cover both cases. Please feel free to make PR.

I think it could be ok if (!ex.getMessage().contains("ocket closed")), it might work, but it might also be the potential risk in the future.
in my opinion, if (!ex.getMessage().startsWith("Socket closed")&& !ex.getMessage().startsWith("socket closed")) would be better.