floka94 commented on issue #702:
URL: https://github.com/apache/plc4x/issues/702#issuecomment-1407473848
Unfortunately the same Exception with your demo project.
```bash
[main] INFO org.apache.plc4x.java.DefaultPlcDriverManager - Instantiating
new PLC Driver Manager with class loader
jdk.internal.loader.ClassLoaders$AppClassLoader@4b1210ee
[main] INFO org.apache.plc4x.java.DefaultPlcDriverManager - Registering
available drivers...
[main] INFO org.apache.plc4x.java.DefaultPlcDriverManager - Registering
driver for Protocol s7 (Siemens S7 (Basic))
[main] INFO org.apache.plc4x.java.transport.tcp.TcpChannelFactory -
Configuring Bootstrap with Configuration{local-rack=1, local-slot=1,
local-tsap=0, remote-rack=0, remote-slot=2, remote-tsap=0, pduSize=1024,
maxAmqCaller=8, maxAmqCallee=8, controllerType='null'}
[nioEventLoopGroup-2-1] INFO
org.apache.plc4x.java.s7.readwrite.protocol.S7ProtocolLogic - S7 Driver running
in ACTIVE mode.
[main] INFO org.apache.plc4x.java.spi.connection.NettyChannelFactory -
Channel is closed, closing worker Group also
[main] INFO org.apache.plc4x.java.spi.connection.NettyChannelFactory -
Worker Group was closed successfully!
java.util.concurrent.ExecutionException: java.lang.NullPointerException:
Cannot invoke
"org.apache.plc4x.java.s7.readwrite.S7PayloadReadVarResponse.getItems()"
because "payload" is null
at
java.base/java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:396)
at
java.base/java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2096)
at com.ceos.plc4x.s7.PLCReadTags.main(PLCReadTags.java:32)
Caused by: java.lang.NullPointerException: Cannot invoke
"org.apache.plc4x.java.s7.readwrite.S7PayloadReadVarResponse.getItems()"
because "payload" is null
at
org.apache.plc4x.java.s7.readwrite.protocol.S7ProtocolLogic.decodeReadResponse(S7ProtocolLogic.java:765)
at
org.apache.plc4x.java.s7.readwrite.protocol.S7ProtocolLogic.lambda$16(S7ProtocolLogic.java:231)
at
java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:646)
at
java.base/java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:510)
at
java.base/java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:2147)
at
org.apache.plc4x.java.s7.readwrite.protocol.S7ProtocolLogic.lambda$23(S7ProtocolLogic.java:269)
at
org.apache.plc4x.java.spi.Plc4xNettyWrapper.decode(Plc4xNettyWrapper.java:187)
at
io.netty.handler.codec.MessageToMessageCodec$2.decode(MessageToMessageCodec.java:81)
at
io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:88)
at
io.netty.handler.codec.MessageToMessageCodec.channelRead(MessageToMessageCodec.java:111)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
at
io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:346)
at
io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:318)
at
io.netty.handler.codec.ByteToMessageCodec.channelRead(ByteToMessageCodec.java:103)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
at
io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
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:919)
at
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)
at
io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:788)
at
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:724)
at
io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:650)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562)
at
io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
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)
EventDispacher Bye!
ObjectProcessor Bye!
```
Here is ma recorded pcapng file, I hobe this can help you to find out the
problem:
[s7_real.zip](https://github.com/apache/plc4x/files/10528144/s7_real.zip)
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