Hi guys,
i am using the Prosys Opcua Client SDK (4.10.6) to build a opcua client and connect it to opcua server.
Most of the time, it works fine. But sometimes when the opc server is not very stable, e.g. the opcua server state is changed from “Running” to “‘CommunicationFault'”, the client will automatically disconnect. But during the disconnecting, the following exception will be reported:

[pc.ua.client.UaClient@4ad8c5a7] client.UaClient :5281: Failed to CloseSession:
com.prosysopc.ua.stack.common.ServiceResultException: Bad_ServerNotConnected (code=0x800D0000, description=”The operation could not complete because the client is not connected to the server.”)
at com.prosysopc.ua.stack.transport.tcp.io.TcpConnection.sendRequest(SourceFile:1671) ~[?:?]
at com.prosysopc.ua.stack.transport.tcp.io.SecureChannelTcp.serviceRequest(SourceFile:852) ~[?:?]
at com.prosysopc.ua.stack.transport.tcp.io.SecureChannelTcp.serviceRequest(SourceFile:822) ~[?:?]
at com.prosysopc.ua.stack.application.SessionChannel.serviceRequest(SourceFile:439) ~[?:?]
at com.prosysopc.ua.stack.transport.ChannelService.CloseSession(SourceFile:432) ~[?:?]
at com.prosysopc.ua.client.UaClient.e(SourceFile:5279) [?:?]
at com.prosysopc.ua.client.UaClient.disconnect(SourceFile:1120) [?:?]
at com.prosysopc.ua.client.UaClient.disconnect(SourceFile:1096) [?:?]
at com.prosysopc.ua.client.UaClient.disconnect(SourceFile:1080) [?:?]
at com.communication.opcua.client.OPCUADAClient.disconnect(OPCUADAClient.java:188) [?:?]
at com.communication.opcua.listener.OPCUADAServerStatusListener.onStateChange(OPCUADAServerStatusListener.java:46) [?:?]
at com.prosysopc.ua.client.UaClient.a(SourceFile:5710) [?:?]
at com.prosysopc.ua.client.UaClient.updateServerStatus(SourceFile:4749) [?:?]
at com.prosysopc.ua.client.UaClient$a.aK(SourceFile:307) [?:?]
at com.prosysopc.ua.client.UaClient$a.run(SourceFile:251) [?:?]
at java.lang.Thread.run(Thread.java:750) [?:1.8.0_422]

Unfortunately, I can’t catch this exception in my own code either, and after this exception occurs, the session of the connection between the client and the server will not be closed and the memory will not be released in client process. So, after multiple disconnections and automatic reconnections, my opcua client will have an OutOfMemory exception.

Could you please help me with this issue ? Is this a issue at Prosys Opcua Client SDK ?

Thank you very much !