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Type:
Bug
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Resolution: Unresolved
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Priority:
Major
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Component/s: support-core-plugin
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Environment:Jenkins: 2.440.2
Agents: 3206.vb_15dcf73f6a_9
Java (Jenkins, Agents): 17.0.10
support-core-plugin: 1421.v1a_899a_c02a_54
After updating to the latest version of the support core plugin I noticed that my inbound agents remain offline and the only way to bring them back online is to reboot the agents when the Jenkins is up and running.
I get the following Jenkins warning for each agent which is trying to connect:
[id=76]   WARNING j.u.ErrorLoggingExecutorService#lambda$wrap$0 java.lang.NullPointerException: Cannot invoke "java.lang.Boolean.booleanValue()" because the return value of "java.util.Map.put(Object, Object)" is null     at com.cloudbees.jenkins.support.impl.SlaveLaunchLogs$Jenkins72799Hack.preOnline(SlaveLaunchLogs.java:200)     at hudson.slaves.SlaveComputer.setChannel(SlaveComputer.java:720)     at jenkins.slaves.DefaultJnlpSlaveReceiver.afterChannel(DefaultJnlpSlaveReceiver.java:176)     at org.jenkinsci.remoting.engine.JnlpConnectionState.fire(JnlpConnectionState.java:337)     at org.jenkinsci.remoting.engine.JnlpConnectionState.fireAfterChannel(JnlpConnectionState.java:428)     at jenkins.agents.WebSocketAgents$Session.lambda$opened$2(WebSocketAgents.java:136)     at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)     at jenkins.security.ImpersonatingExecutorService$1.run(ImpersonatingExecutorService.java:68)     at jenkins.util.ErrorLoggingExecutorService.lambda$wrap$0(ErrorLoggingExecutorService.java:51)     at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)     at java.base/java.util.concurrent.FutureTask.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)
By disabling the support core plugin the problem disappears.
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