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https://issues.apache.org/jira/browse/PLC4X-245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17187646#comment-17187646
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Christofer Dutz commented on PLC4X-245:
---------------------------------------
Hmmm ... I should double check, if I'm using the Connection-Pool together with
the Scraper, because this should identify and work around such errors ... So at
least we identified that it's not hanging up because the driver isn't working
correctly ... now we need to improve the NiFi integration.
> [Modbus] Apache NiFi processor throws java.io.IOException after a while
> -----------------------------------------------------------------------
>
> Key: PLC4X-245
> URL: https://issues.apache.org/jira/browse/PLC4X-245
> Project: Apache PLC4X
> Issue Type: Bug
> Components: Driver-Modbus, Integration-NiFi
> Affects Versions: 0.7.0
> Environment: Apache NiFi 1.12.0, Win2012 Server, PLX4X Nar 0.7.0
> (https://mvnrepository.com/artifact/org.apache.plc4x/plc4j-nifi-plc4x-nar/0.7.0)
> Reporter: Turker TUNALI
> Priority: Major
> Attachments: modbustrace_200828.pcapng, modbustrace_200828_4.pcapng
>
> Original Estimate: 48h
> Remaining Estimate: 48h
>
> My Plc4xSourceProcessor's, PLC connection String is
> "modbus:tcp://[10.0.2.238:502?slave=1|http://10.0.2.238:502/?slave=1]"; and
> PLC resource address String is "test1=holding-register:1"
>
> I can get the values for 5-10 times with 5 second intervals but then I get
> below exception. I can read the values with the Modbus Poll application, so
> most probably the PLC4X side has a problem.
>
> I may also get some other exceptions when starting the processor, which are
> also below.
>
> PS: Wireshark trace is attached. I've read 16 times then I get the exception.
>
> *
> -- This is the exception which I get after some successful read operations.*
> 2020-08-27 13:19:06,091 WARN [nioEventLoopGroup-8-1]
> io.netty.channel.DefaultChannelPipeline An exceptionCaught() event was fired,
> and it reached at the tail of the pipeline. It usually means the last handler
> in the pipeline did not handle the exception.
> java.io.IOException: An existing connection was forcibly closed by the
> remote host
> at sun.nio.ch.SocketDispatcher.read0(Native Method)
> at sun.nio.ch.SocketDispatcher.read(Unknown Source)
> at sun.nio.ch.IOUtil.readIntoNativeBuffer(Unknown Source)
> at sun.nio.ch.IOUtil.read(Unknown Source)
> at sun.nio.ch.SocketChannelImpl.read(Unknown Source)
> at io.netty.buffer.PooledByteBuf.setBytes(PooledByteBuf.java:253)
> at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:1133)
> at
> io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:350)
> at
> io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:148)
> at
> io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714)
> at
> io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:650)
> at
> io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:576)
> at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
> at
> io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
> at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
> at
> io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
> at java.lang.Thread.run(Unknown Source)
>
>
> -- This is the exception which I get sometimes when starting up the
> processor.*
> 2020-08-27 13:17:16,813 WARN [Timer-Driven Process Thread-11]
> o.a.n.controller.tasks.ConnectableTask Administratively Yielding
> Plc4xSourceProcessor[id=2f12f5b4-0174-1000-724e-a53ba0fc1652] due to uncaught
> Exception: java.lang.NullPointerException
> java.lang.NullPointerException: null
> at
> org.apache.plc4x.nifi.Plc4xSourceProcessor.onTrigger(Plc4xSourceProcessor.java:50)
> at
> org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)
> at
> org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1174)
> at
> org.apache.nifi.controller.tasks.ConnectableTask.invoke(ConnectableTask.java:213)
> at
> org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:117)
> at org.apache.nifi.engine.FlowEngine$2.run(FlowEngine.java:110)
> at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
> at java.util.concurrent.FutureTask.runAndReset(Unknown Source)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(Unknown
> Source)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown
> Source)
> at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
> at java.lang.Thread.run(Unknown Source)
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