NullPointerException error

Joystick9 months ago

Hi community,

In the log file I very frequently get messages similar to the below example. Just the 4 lines every time, nothing more.
There is not enough info in it for me to determine what device this could possibly be coming from.
Are there any other possible ways anyone is aware of that could assist me working out what device is sending the message.

2024-02-08 00:36:12  INFO: [T367bde45] connected
2024-02-08 00:41:12  INFO: [T367bde45] timed out
2024-02-08 00:41:12  INFO: [T367bde45] disconnected
2024-02-08 00:41:12  INFO: [T367bde45] error - NullPointerException

Anton Tananaev9 months ago

Enable full stack traces.

Joystick9 months ago

Thanks Anton,
Now getting the below error. It is on customized code so the issue would be on my end.
Any idea which file I need to look at based on the error?

2024-02-09 10:22:00  INFO: [T9bfc28ef] connected
2024-02-09 10:22:00  INFO: [T9bfc28ef] disconnected
2024-02-09 10:22:00  INFO: [T9bfc28ef] error - 
java.lang.NullPointerException
    at java.base/java.util.concurrent.ConcurrentHashMap.replaceNode(ConcurrentHashMap.java:1111)
    at java.base/java.util.concurrent.ConcurrentHashMap.remove(ConcurrentHashMap.java:1102)
    at org.traccar.session.ConnectionManager.deviceDisconnected(ConnectionManager.java:191)
    at org.traccar.MainEventHandler.channelInactive(MainEventHandler.java:168)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:305)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:281)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:274)
    at io.netty.handler.codec.ByteToMessageDecoder.channelInputClosed(ByteToMessageDecoder.java:411)
    at io.netty.handler.codec.ByteToMessageDecoder.channelInactive(ByteToMessageDecoder.java:376)
    at org.traccar.WrapperInboundHandler.channelInactive(WrapperInboundHandler.java:50)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:305)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:281)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:274)
    at io.netty.channel.ChannelInboundHandlerAdapter.channelInactive(ChannelInboundHandlerAdapter.java:81)
    at org.traccar.handler.OpenChannelHandler.channelInactive(OpenChannelHandler.java:38)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:303)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:281)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:274)
    at io.netty.channel.ChannelInboundHandlerAdapter.channelInactive(ChannelInboundHandlerAdapter.java:81)
    at io.netty.handler.timeout.IdleStateHandler.channelInactive(IdleStateHandler.java:277)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:303)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:281)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:274)
    at io.netty.channel.DefaultChannelPipeline$HeadContext.channelInactive(DefaultChannelPipeline.java:1405)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:301)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:281)
    at io.netty.channel.DefaultChannelPipeline.fireChannelInactive(DefaultChannelPipeline.java:901)
    at io.netty.channel.AbstractChannel$AbstractUnsafe$7.run(AbstractChannel.java:813)
    at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:173)
    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:166)
    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:566)
    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:829)

Anton Tananaev9 months ago

You should be able to safely ignore this error.