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Jenkins Gearman Plugin causes NullPointerException and infinite loop. #5

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Jenkins Gearman Plugin causes NullPointerException and infinite loop.#5
@moberacker

Description

@moberacker
moberacker
opened on Aug 11, 2015
Setup:
java 1.8.0_51
Jenkins Gearman Plugin version => 0.1.2
Jenkins ver. 1.623
gearman server gearman-server-0.8.11-20150731.182506-1 (with cluster configuration)

The Jenkins Gearman Plugin installed on Jenkins fails with NullPointerException, which seems to cause the infinite loop, with information as below:

09:46:23.235 - [nioEventLoopGroup-3-2] DEBUG n.j.gearman.server.net.PacketHandler - Creating new handler!
09:46:23.235 - [nioEventLoopGroup-3-2] DEBUG n.j.gearman.server.net.PacketHandler - Client closed channel: [id: 0x21448de3, /127.0.0.1:50369 :> 0.0.0.0/0.0.0.0:4740]
09:46:23.235 - [nioEventLoopGroup-3-3] DEBUG n.j.gearman.server.net.PacketHandler - Creating new handler!
09:46:23.235 - [nioEventLoopGroup-3-4] DEBUG n.j.gearman.server.net.PacketHandler - Creating new handler!
09:46:23.235 - [nioEventLoopGroup-3-3] DEBUG n.j.gearman.server.net.Decoder - ---> SET_CLIENT_ID
09:46:23.235 - [nioEventLoopGroup-3-3] DEBUG n.j.gearman.server.net.PacketHandler -  ---> SET_CLIENT_ID
09:46:23.235 - [nioEventLoopGroup-3-3] DEBUG n.j.gearman.server.net.Decoder - ---> SET_CLIENT_ID
09:46:23.235 - [nioEventLoopGroup-3-3] DEBUG n.j.gearman.server.net.PacketHandler -  ---> SET_CLIENT_ID
09:46:23.235 - [nioEventLoopGroup-3-4] DEBUG n.j.gearman.server.net.Decoder - ---> SET_CLIENT_ID
09:46:23.235 - [nioEventLoopGroup-3-4] DEBUG n.j.gearman.server.net.PacketHandler -  ---> SET_CLIENT_ID
09:46:23.235 - [nioEventLoopGroup-3-3] DEBUG n.j.gearman.server.net.Decoder - ---> RESET_ABILITIES
09:46:23.235 - [nioEventLoopGroup-3-3] DEBUG n.j.gearman.server.net.PacketHandler -  ---> RESET_ABILITIES
09:46:23.235 - [nioEventLoopGroup-3-4] DEBUG n.j.gearman.server.net.Decoder - ---> SET_CLIENT_ID
09:46:23.235 - [nioEventLoopGroup-3-4] DEBUG n.j.gearman.server.net.PacketHandler -  ---> SET_CLIENT_ID
09:46:23.235 - [nioEventLoopGroup-3-4] DEBUG n.j.gearman.server.net.Decoder - ---> RESET_ABILITIES
09:46:23.235 - [nioEventLoopGroup-3-4] DEBUG n.j.gearman.server.net.PacketHandler -  ---> RESET_ABILITIES
09:46:23.235 - [nioEventLoopGroup-3-3] DEBUG n.j.gearman.server.net.Decoder - ---> CAN_DO
09:46:23.235 - [nioEventLoopGroup-3-3] DEBUG n.j.gearman.server.net.PacketHandler -  ---> CAN_DO
09:46:23.235 - [nioEventLoopGroup-3-4] DEBUG n.j.gearman.server.net.Decoder - ---> GRAB_JOB_UNIQ
09:46:23.235 - [nioEventLoopGroup-3-4] DEBUG n.j.gearman.server.net.PacketHandler -  ---> GRAB_JOB_UNIQ
09:46:23.235 - [nioEventLoopGroup-3-4] DEBUG n.j.gearman.server.net.Encoder - <--- NO_JOB
09:46:23.251 - [nioEventLoopGroup-3-3] WARN  n.j.gearman.server.net.PacketHandler - Unexpected exception from downstream.
java.lang.NullPointerException: null
    at net.johnewart.gearman.engine.core.JobManager.registerWorkerAbility(JobManager.java:81) ~[gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at net.johnewart.gearman.server.net.NetworkManager.registerAbility(NetworkManager.java:88) ~[gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at net.johnewart.gearman.server.net.PacketHandler.handlePacket(PacketHandler.java:100) ~[gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at net.johnewart.gearman.server.net.PacketHandler.channelRead0(PacketHandler.java:42) ~[gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:98) ~[gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:334) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:320) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:173) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:334) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:320) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:785) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:100) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:497) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:465) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:359) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at java.lang.Thread.run(Unknown Source) [na:1.8.0_51]
09:46:23.251 - [nioEventLoopGroup-3-4] DEBUG n.j.gearman.server.net.Decoder - ---> PRE_SLEEP
09:46:23.267 - [nioEventLoopGroup-3-4] DEBUG n.j.gearman.server.net.PacketHandler -  ---> PRE_SLEEP
09:46:23.267 - [nioEventLoopGroup-3-3] DEBUG n.j.gearman.server.net.PacketHandler - Client closed channel: [id: 0x2c94c700, /127.0.0.1:50384 :> 0.0.0.0/0.0.0.0:4740]
09:46:23.267 - [nioEventLoopGroup-3-3] WARN  n.j.gearman.server.net.PacketHandler - Unexpected exception from downstream.
java.lang.NullPointerException: null
    at net.johnewart.gearman.engine.core.JobManager.unregisterWorker(JobManager.java:98) ~[gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at net.johnewart.gearman.server.net.NetworkManager.channelDisconnected(NetworkManager.java:63) ~[gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at net.johnewart.gearman.server.net.PacketHandler.channelInactive(PacketHandler.java:58) ~[gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.DefaultChannelHandlerContext.invokeChannelInactive(DefaultChannelHandlerContext.java:234) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.DefaultChannelHandlerContext.fireChannelInactive(DefaultChannelHandlerContext.java:220) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.handler.codec.ReplayingDecoder.channelInactive(ReplayingDecoder.java:346) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.DefaultChannelHandlerContext.invokeChannelInactive(DefaultChannelHandlerContext.java:234) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.DefaultChannelHandlerContext.fireChannelInactive(DefaultChannelHandlerContext.java:220) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.DefaultChannelPipeline.fireChannelInactive(DefaultChannelPipeline.java:767) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.AbstractChannel$AbstractUnsafe$5.run(AbstractChannel.java:558) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:354) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:366) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at java.lang.Thread.run(Unknown Source) [na:1.8.0_51]
09:46:23.267 - [nioEventLoopGroup-3-5] DEBUG n.j.gearman.server.net.PacketHandler - Creating new handler!
09:46:23.267 - [nioEventLoopGroup-3-5] DEBUG n.j.gearman.server.net.Decoder - ---> SET_CLIENT_ID
09:46:23.267 - [nioEventLoopGroup-3-5] DEBUG n.j.gearman.server.net.PacketHandler -  ---> SET_CLIENT_ID
09:46:23.267 - [nioEventLoopGroup-3-5] DEBUG n.j.gearman.server.net.Decoder - ---> RESET_ABILITIES
09:46:23.267 - [nioEventLoopGroup-3-5] DEBUG n.j.gearman.server.net.PacketHandler -  ---> RESET_ABILITIES
09:46:23.267 - [nioEventLoopGroup-3-5] DEBUG n.j.gearman.server.net.Decoder - ---> CAN_DO
09:46:23.267 - [nioEventLoopGroup-3-5] DEBUG n.j.gearman.server.net.PacketHandler -  ---> CAN_DO
09:46:23.267 - [nioEventLoopGroup-3-5] WARN  n.j.gearman.server.net.PacketHandler - Unexpected exception from downstream.
java.lang.NullPointerException: null
    at net.johnewart.gearman.engine.core.JobManager.registerWorkerAbility(JobManager.java:81) ~[gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at net.johnewart.gearman.server.net.NetworkManager.registerAbility(NetworkManager.java:88) ~[gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at net.johnewart.gearman.server.net.PacketHandler.handlePacket(PacketHandler.java:100) ~[gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at net.johnewart.gearman.server.net.PacketHandler.channelRead0(PacketHandler.java:42) ~[gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:98) ~[gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:334) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:320) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:173) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:334) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:320) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:785) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:100) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:497) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:465) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:359) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at java.lang.Thread.run(Unknown Source) [na:1.8.0_51]
09:46:23.282 - [nioEventLoopGroup-3-5] DEBUG n.j.gearman.server.net.PacketHandler - Client closed channel: [id: 0x3ccd1be1, /127.0.0.1:50405 :> 0.0.0.0/0.0.0.0:4740]
09:46:23.282 - [nioEventLoopGroup-3-5] WARN  n.j.gearman.server.net.PacketHandler - Unexpected exception from downstream.
java.lang.NullPointerException: null
    at net.johnewart.gearman.engine.core.JobManager.unregisterWorker(JobManager.java:98) ~[gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at net.johnewart.gearman.server.net.NetworkManager.channelDisconnected(NetworkManager.java:63) ~[gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at net.johnewart.gearman.server.net.PacketHandler.channelInactive(PacketHandler.java:58) ~[gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.DefaultChannelHandlerContext.invokeChannelInactive(DefaultChannelHandlerContext.java:234) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.DefaultChannelHandlerContext.fireChannelInactive(DefaultChannelHandlerContext.java:220) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.handler.codec.ReplayingDecoder.channelInactive(ReplayingDecoder.java:346) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.DefaultChannelHandlerContext.invokeChannelInactive(DefaultChannelHandlerContext.java:234) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.DefaultChannelHandlerContext.fireChannelInactive(DefaultChannelHandlerContext.java:220) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.DefaultChannelPipeline.fireChannelInactive(DefaultChannelPipeline.java:767) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.AbstractChannel$AbstractUnsafe$5.run(AbstractChannel.java:558) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:354) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:366) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101) [gearman-server-0.8.11-20150731.182506-1.jar:0.4]
    at java.lang.Thread.run(Unknown Source) [na:1.8.0_51]

it seems to be a problem in JobManager.java method registerWorkerAbility(...) and method unregisterWorker(...) in combination with the cluster configuration...when commenting the lines

//metrics.handleWorkerAddition(worker);

and

//metrics.handleWorkerRemoval(worker);

solves the error but with the disadvantage that the web management console doesn't show the correct values or starting the gearman-server without cluster configuration.

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