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NullPointerException: Cannot read field "maxRecvBufferSize" because "this.nj.mX" is null"
December 12, 2024
15:08, EET
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devaskim
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February 29, 2024
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Today we accidentally caught NullPointerException, no specifc steps to reproduce.
Any thought is it critical or could be ignored? Thanks in advance

Here is stack trace (SDK 4.8.0)

12.12.2024 15:43:02,637 ERROR com.prosysopc.ua.stack.transport.tcp.io.TcpConnection Error in ReadThread – [TcpConnection/Read] com.prosysopc.ua.stack.transport.tcp.io.TcpConnection$b.run (SourceFile:826)
com.prosysopc.ua.stack.common.ServiceResultException: Bad_InternalError (code=0x80020000, description=”2147614720, Cannot read field “maxRecvBufferSize” because “this.nj.mX” is null”)
at com.prosysopc.ua.stack.transport.tcp.io.TcpConnection$b.run(SourceFile:825)
Caused by: java.lang.NullPointerException: Cannot read field “maxRecvBufferSize” because “this.nj.mX” is null
at com.prosysopc.ua.stack.transport.tcp.io.TcpConnection$b.run(SourceFile:542)

December 12, 2024
16:47, EET
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Bjarne Boström
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Hi,

That can be ignored as a cosmetic problem (but we should still fix it). Your SDK version is a bit old, but I think that could happen even with the latest one. In short it would look like a race-condition when a connection is closing, thus it shouldn’t affect anything (other than logging etc. stuff that might of course cause other actions etc..).

Tech details:
Some of the code-base is quite old, some from the era when it was common to “null references” when “disposing objects”. Seems that happens in this case when the connection is being closed, but the thread reading the socket managed to try to access that field before terminating.

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