dominikriemer commented on issue #2944:
URL: https://github.com/apache/streampipes/issues/2944#issuecomment-2177142976
Hi @DerSalm that's really strange..when I tried to reproduce the error with
an actively running adapter and then by navigating to edit -> guess schema, I
got the same error than you.
But then I tried it again and it seems that the error only _sometimes_
occurs. E.g., when clicking the refresh button in the schema editor, I
sometimes get the `Could not read PLC` error and (sometimes after 3-5 times),
everything works again.
Can you confirm this behaviour?
The logs show the error below which seems to be somehow related to
apache/plc4x#1593 with a similar error message below.
@ottlukas @chrisdutz do you have any idea?
PR #2946 contains the latest code after I made some improvements but still
has the same issue - the problem occurs in the `OneTimePlcRequestReader` class.
```
2024-06-18T23:33:57.113+02:00 WARN 56540 --- [ntLoopGroup-8-1]
i.n.channel.embedded.EmbeddedChannel : More than one exception was raised.
Will report only the first one and log others.
io.netty.handler.codec.DecoderException:
io.netty.handler.codec.EncoderException: MessageToMessageCodec$1 must produce
at least one message.
at
io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:98)
at
io.netty.handler.codec.MessageToMessageCodec.channelRead(MessageToMessageCodec.java:111)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
at
io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)
at
io.netty.handler.codec.MessageToMessageCodec.channelRead(MessageToMessageCodec.java:111)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
at
io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:324)
at
io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:296)
at
io.netty.handler.codec.ByteToMessageCodec.channelRead(ByteToMessageCodec.java:103)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
at
io.netty.handler.logging.LoggingHandler.channelRead(LoggingHandler.java:280)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
at
org.apache.plc4x.java.s7.readwrite.protocol.S7HMuxImpl.decode(S7HMuxImpl.java:145)
at
org.apache.plc4x.java.s7.readwrite.protocol.S7HMuxImpl.decode(S7HMuxImpl.java:1)
at
io.netty.handler.codec.MessageToMessageCodec$2.decode(MessageToMessageCodec.java:81)
at
io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:88)
at
io.netty.handler.codec.MessageToMessageCodec.channelRead(MessageToMessageCodec.java:111)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
at
io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at
io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
at
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)
at
io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:722)
at
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:658)
at
io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:584)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:496)
at
io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)
at
io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: io.netty.handler.codec.EncoderException: MessageToMessageCodec$1
must produce at least one message.
at
io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:96)
at
io.netty.handler.codec.MessageToMessageCodec.write(MessageToMessageCodec.java:116)
at
io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:717)
at
io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:709)
at
io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:792)
at
io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:702)
at
io.netty.handler.logging.LoggingHandler.write(LoggingHandler.java:288)
at
io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:717)
at
io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:709)
at
io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:792)
at
io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:702)
at
io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:113)
at
io.netty.handler.codec.ByteToMessageCodec.write(ByteToMessageCodec.java:108)
at
io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:717)
at
io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:709)
at
io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:792)
at
io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:702)
at
io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:110)
at
io.netty.handler.codec.MessageToMessageCodec.write(MessageToMessageCodec.java:116)
at
io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:717)
at
io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:709)
at
io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:792)
at
io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:702)
at
io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:110)
at
io.netty.handler.codec.MessageToMessageCodec.write(MessageToMessageCodec.java:116)
at
io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:717)
at
io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:764)
at
io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:790)
at
io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:758)
at
io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:808)
at
io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:1025)
at
io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:306)
at
org.apache.plc4x.java.spi.internal.DefaultConversationContext.sendToWire(DefaultConversationContext.java:70)
at
org.apache.plc4x.java.spi.internal.DefaultSendRequestContext.handle(DefaultSendRequestContext.java:107)
at
org.apache.plc4x.java.spi.internal.DefaultSendRequestContext.handle(DefaultSendRequestContext.java:1)
at
org.apache.plc4x.java.s7.readwrite.protocol.S7ProtocolLogic.lambda$8(S7ProtocolLogic.java:231)
at
java.base/java.util.function.Consumer.lambda$andThen$0(Consumer.java:65)
at
org.apache.plc4x.java.spi.Plc4xNettyWrapper.decode(Plc4xNettyWrapper.java:183)
at
io.netty.handler.codec.MessageToMessageCodec$2.decode(MessageToMessageCodec.java:81)
at
io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:88)
... 40 common frames omitted
```
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