Details
Major Description
When using the ice4j library with integrated Mina 2.0.17, we have run into an issue that is caused by our defensive action against browsers. The idea was to suspendRead on the target IoSession when it was in the process of being closed / cleaned up, but in doing so, the server can get in a bad state where it no longer accepts connections. As seen in the log snipit below, suspendRead on the IoSession causes a UOEx in the shared NioDatagramAcceptor; "shared" being the operative word here. It would seem to us that acceptors may be shared with impunity, if this is not the case, we can update ice4j to prevent sharing. I'll add some test code if required, but for now, this is what I have and here is the github location of our ice4j fork https://github.com/Red5/ice4j
2018-05-23 14:31:00,433 [NioDatagramAcceptor-8] WARN org.ice4j.ice.nio.IceHandler - Exception on 10.198.219.143:60515/udp
org.apache.mina.filter.codec.ProtocolDecoderException: java.lang.UnsupportedOperationException (Hexdump: 00 01 00 54 21 12 A4 42 4D 57 6B 68 38 71 54 65 2F 51 70 51 00 06 00 13 61 6E 6E 64 6E 31 63 65 36 6D 68 74 66 35 3A 77 47 6E 5A 00 C0 57 00 04 00 00 00 32 80 29 00 08 09 6C 92 9E 9D BC 63 05 00 24 00 04 6E 00 1F 00 00 08 00 14 98 EC A7 54 01 47 86 DE FF 18 52 B5 59 74 A6 51 D9 C9 A1 C6 80 28 00 04 13 6F 2C F0)
{{ at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:262)}}
{{ at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:641)}}
{{ at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1300(DefaultIoFilterChain.java:48)}}
{{ at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:1114)}}
{{ at org.apache.mina.core.filterchain.IoFilterAdapter.messageReceived(IoFilterAdapter.java:121)}}
{{ at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:641)}}
{{ at org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:634)}}
{{ at org.apache.mina.transport.socket.nio.NioDatagramAcceptor.readHandle(NioDatagramAcceptor.java:306)}}
{{ at org.apache.mina.transport.socket.nio.NioDatagramAcceptor.processReadySessions(NioDatagramAcceptor.java:270)}}
{{ at org.apache.mina.transport.socket.nio.NioDatagramAcceptor.access$700(NioDatagramAcceptor.java:68)}}
{{ at org.apache.mina.transport.socket.nio.NioDatagramAcceptor$Acceptor.run(NioDatagramAcceptor.java:181)}}
{{ at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64)}}
{{ 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)}}
Caused by: java.lang.UnsupportedOperationException: null
{{ at org.apache.mina.transport.socket.nio.NioDatagramAcceptor.updateTrafficControl(NioDatagramAcceptor.java:823)}}
{{ at org.apache.mina.transport.socket.nio.NioDatagramAcceptor.updateTrafficControl(NioDatagramAcceptor.java:68)}}
{{ at org.apache.mina.core.session.AbstractIoSession.suspendRead(AbstractIoSession.java:718)}}
{{ at org.ice4j.ice.nio.IceDecoder.decode(IceDecoder.java:220)}}
{{ at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:253)}}
{{ ... 14 common frames omitted}}