[Bug] Two NPE problems with Tcp Protocol Resolver

[mytang0]

Search before asking

• I had searched in the issues and found no similar issues.

Environment

Linux

EventMesh version

master

What happened

When the property 'subsystem' of UserAgent is null

How to reproduce

1. Explicitly throw the 'key' of the exception to facilitate problem location.
2. Fix NPE

Debug logs

Location:

java.lang.NullPointerException: null
at org.apache.eventmesh.protocol.meshmessage.resolver.tcp.TcpMessageProtocolResolver.buildEvent(TcpMessageProtocolResolver.java:82)
at org.apache.eventmesh.protocol.meshmessage.MeshMessageProtocolAdaptor.deserializeTcpProtocol(MeshMessageProtocolAdaptor.java:81)
at org.apache.eventmesh.protocol.meshmessage.MeshMessageProtocolAdaptor.toCloudEvent(MeshMessageProtocolAdaptor.java:59)
at org.apache.eventmesh.runtime.core.protocol.tcp.client.task.MessageTransferTask.run(MessageTransferTask.java:110)

and location:

upload trace fail when finishSpanWithException
java.lang.NullPointerException: null
at org.apache.eventmesh.runtime.trace.Trace.addTraceInfoToSpan(Trace.java:104)
at org.apache.eventmesh.runtime.trace.TraceUtils.finishSpanWithException(TraceUtils.java:110)
at org.apache.eventmesh.runtime.core.protocol.tcp.client.task.MessageTransferTask.run(MessageTransferTask.java:184)

Are you willing to submit PR?

• Yes I am willing to submit a PR!