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Posted to issues@plc4x.apache.org by "parthgoel06 (via GitHub)" <gi...@apache.org> on 2025/06/07 16:44:04 UTC
[I] [Bug]: Getting error while reading struct type node value and it's attributes
parthgoel06 opened a new issue, #2136:
URL: https://github.com/apache/plc4x/issues/2136
### What happened?
My OPCUA node ID is like so -> ns=6;s=Arp.Plc.Eclr/THYROBOX_COMPLETE_SYS.R_200
I have created a testing Python script that easily reads this address, but when I use PLC4X, I get an error. I have tried building the addresses as such for PLC4X ->
1. ns=6;s=Arp.Plc.Eclr/THYROBOX_COMPLETE_SYS.R_200;WORD
2. ns=6;s=Arp.Plc.Eclr/THYROBOX_COMPLETE_SYS/R_200;WORD
3. ns=6;s=Arp.Plc.Eclr/THYROBOX_COMPLETE_SYS;a=R_200;WORD
Error ->
```
java.util.concurrent.ExecutionException: java.lang.NullPointerException: Cannot invoke "org.apache.plc4x.java.spi.messages.utils.PlcTagItem.getResponseCode()" because the return value of "java.util.LinkedHashMap.get(Object)" is null
at java.base/java.util.concurrent.CompletableFuture.wrapInExecutionException(Unknown Source)
at java.base/java.util.concurrent.CompletableFuture.reportGet(Unknown Source)
at java.base/java.util.concurrent.CompletableFuture.get(Unknown Source)
at com.example.plc.polling.AbstractPlc4xPoller.run(AbstractPlc4xPoller.java:108)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.base/java.util.concurrent.FutureTask.runAndReset(Unknown Source)
at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException: Cannot invoke "org.apache.plc4x.java.spi.messages.utils.PlcTagItem.getResponseCode()" because the return value of "java.util.LinkedHashMap.get(Object)" is null
at org.apache.plc4x.java.spi.messages.DefaultPlcReadRequest.getTagResponseCode(DefaultPlcReadRequest.java:86)
at org.apache.plc4x.java.spi.connection.AbstractPlcConnection.lambda$0(AbstractPlcConnection.java:221)
at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(Unknown Source)
at java.base/java.util.concurrent.CompletableFuture.postComplete(Unknown Source)
at java.base/java.util.concurrent.CompletableFuture.complete(Unknown Source)
at org.apache.plc4x.java.spi.optimizer.BaseOptimizer.lambda$8(BaseOptimizer.java:206)
at java.base/java.util.concurrent.CompletableFuture.uniHandle(Unknown Source)
at java.base/java.util.concurrent.CompletableFuture$UniHandle.tryFire(Unknown Source)
at java.base/java.util.concurrent.CompletableFuture.postComplete(Unknown Source)
at java.base/java.util.concurrent.CompletableFuture.complete(Unknown Source)
at org.apache.plc4x.java.opcua.protocol.OpcuaProtocolLogic.bridge(OpcuaProtocolLogic.java:899)
at org.apache.plc4x.java.opcua.protocol.OpcuaProtocolLogic.lambda$8(OpcuaProtocolLogic.java:246)
at java.base/java.util.concurrent.CompletableFuture.uniWhenComplete(Unknown Source)
at java.base/java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(Unknown Source)
at java.base/java.util.concurrent.CompletableFuture.postComplete(Unknown Source)
at java.base/java.util.concurrent.CompletableFuture.complete(Unknown Source)
at org.apache.plc4x.java.opcua.context.Conversation.lambda$38(Conversation.java:342)
at java.base/java.util.function.Consumer.lambda$andThen$0(Unknown Source)
at org.apache.plc4x.java.spi.Plc4xNettyWrapper.decode(Plc4xNettyWrapper.java:194)
at io.netty.handler.codec.MessageToMessageCodec$1.decode(MessageToMessageCodec.java:67)
at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:91)
at io.netty.handler.codec.MessageToMessageCodec.channelRead(MessageToMessageCodec.java:120)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:107)
at io.netty.handler.codec.MessageToMessageCodec.channelRead(MessageToMessageCodec.java:120)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:346)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:318)
at io.netty.handler.codec.ByteToMessageCodec.channelRead(ByteToMessageCodec.java:103)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1357)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:440)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:868)
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:796)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:732)
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:658)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562)
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:998)
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
... 1 common frames omitted
```
Is there any other way of reading OPCUA struct attributes in PLC4X?
### Version
v0.13.0-SNAPSHOT
### Programming Languages
- [ ] plc4c
- [ ] plc4go
- [x] plc4j
- [ ] plc4net
- [ ] plc4py
### Protocols
- [ ] AB-Ethernet
- [ ] ADS /AMS
- [ ] BACnet/IP
- [ ] C-Bus
- [ ] CANopen
- [ ] EtherNet/IP
- [ ] Firmata
- [ ] IEC-69870
- [ ] KNXnet/IP
- [ ] Modbus
- [x] OPC-UA
- [ ] Profinet
- [ ] S7
- [ ] S7-light
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Re: [I] [Bug]: Getting error while reading struct type node value and it's attributes
Posted by "parthgoel06 (via GitHub)" <gi...@apache.org>.
parthgoel06 closed issue #2136: [Bug]: Getting error while reading struct type node value and it's attributes
URL: https://github.com/apache/plc4x/issues/2136
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Re: [I] [Bug]: Getting error while reading struct type node value and it's attributes
Posted by "parthgoel06 (via GitHub)" <gi...@apache.org>.
parthgoel06 commented on issue #2136:
URL: https://github.com/apache/plc4x/issues/2136#issuecomment-2952747265
Never mind, the issue was in data type WORD, worked using ns=6;s=Arp.Plc.Eclr/THYROBOX_COMPLETE_SYS.R_200;INT
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