Below you can find the log, which I see in the wild. Likely it happens, because Remoting classloaded Servlet API 2.x on the agent side and then cached it. Not 100% sure
{noformat}
06:56:57 FATAL: Remote call on JNLP4-connect connection from AGENT failed
06:56:57 java.util.MissingResourceException: Can't find bundle for base name javax.servlet.LocalStrings, locale en_US
06:56:57 at java.util.ResourceBundle.throwMissingResourceException(ResourceBundle.java:1499)
06:56:57 at java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1322)
06:56:57 at java.util.ResourceBundle.getBundle(ResourceBundle.java:721)
06:56:57 at javax.servlet.GenericServlet.<clinit>(GenericServlet.java:95)
06:56:57 at hudson.model.Node$Mode.<clinit>(Node.java:592)
06:56:57 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
06:56:57 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
06:56:57 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
06:56:57 at java.lang.reflect.Method.invoke(Method.java:606)
06:56:57 at java.lang.Class.getEnumConstantsShared(Class.java:3046)
06:56:57 at java.lang.Class.getEnumConstants(Class.java:3024)
06:56:57 at jenkins.model.Jenkins.<clinit>(Jenkins.java:5077)
06:56:57 at hudson.model.Computer.<clinit>(Computer.java:1719)
06:56:57 at hudson.util.ProcessTree.getKillers(ProcessTree.java:156)
06:56:57 at hudson.util.ProcessTree$OSProcess.killByKiller(ProcessTree.java:217)
06:56:57 at hudson.util.ProcessTree$Windows$1.killRecursively(ProcessTree.java:430)
06:56:57 at hudson.util.ProcessTree$Windows.killAll(ProcessTree.java:490)
06:56:57 at hudson.Launcher$RemoteLauncher$KillTask.call(Launcher.java:996)
06:56:57 at hudson.Launcher$RemoteLauncher$KillTask.call(Launcher.java:987)
06:56:57 at hudson.remoting.UserRequest.perform(UserRequest.java:153)
06:56:57 at hudson.remoting.UserRequest.perform(UserRequest.java:50)
06:56:57 at hudson.remoting.Request$2.run(Request.java:336)
06:56:57 at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:68)
06:56:57 at java.util.concurrent.FutureTask.run(FutureTask.java:262)
06:56:57 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
06:56:57 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
06:56:57 at hudson.remoting.Engine$1$1.run(Engine.java:94)
06:56:57 at java.lang.Thread.run(Thread.java:744)
06:56:57 Caused: java.lang.ExceptionInInitializerError
06:56:57 at hudson.model.Node$Mode.<clinit>(Node.java:592)
06:56:57 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
06:56:57 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
06:56:57 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
06:56:57 at java.lang.reflect.Method.invoke(Method.java:606)
06:56:57 at java.lang.Class.getEnumConstantsShared(Class.java:3046)
06:56:57 at java.lang.Class.getEnumConstants(Class.java:3024)
06:56:57 at jenkins.model.Jenkins.<clinit>(Jenkins.java:5077)
06:56:57 at hudson.model.Computer.<clinit>(Computer.java:1719)
06:56:57 at hudson.util.ProcessTree.getKillers(ProcessTree.java:156)
06:56:57 at hudson.util.ProcessTree$OSProcess.killByKiller(ProcessTree.java:217)
06:56:57 at hudson.util.ProcessTree$Windows$1.killRecursively(ProcessTree.java:430)
06:56:57 at hudson.util.ProcessTree$Windows.killAll(ProcessTree.java:490)
06:56:57 at hudson.Launcher$RemoteLauncher$KillTask.call(Launcher.java:996)
06:56:57 at hudson.Launcher$RemoteLauncher$KillTask.call(Launcher.java:987)
06:56:57 at hudson.remoting.UserRequest.perform(UserRequest.java:153)
06:56:57 at hudson.remoting.UserRequest.perform(UserRequest.java:50)
06:56:57 at hudson.remoting.Request$2.run(Request.java:336)
06:56:57 at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:68)
06:56:57 at java.util.concurrent.FutureTask.run(FutureTask.java:262)
06:56:57 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
06:56:57 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
06:56:57 at hudson.remoting.Engine$1$1.run(Engine.java:94)
06:56:57 at java.lang.Thread.run(Thread.java:744)
06:56:57 at ......remote call to JNLP4-connect connection from splw764bt301p.caecorp.cae.com/142.39.32.44:60229(Native Method)
06:56:57 at hudson.remoting.Channel.attachCallSiteStackTrace(Channel.java:1545)
06:56:57 at hudson.remoting.UserResponse.retrieve(UserRequest.java:253)
06:56:57 at hudson.remoting.Channel.call(Channel.java:830)
06:56:57 Caused: java.io.IOException: Remote call on JNLP4-connect connection from splw764bt301p.caecorp.cae.com/142.39.32.44:60229 failed
06:56:57 at hudson.remoting.Channel.call(Channel.java:838)
06:56:57 at hudson.Launcher$RemoteLauncher.kill(Launcher.java:984)
06:56:57 at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:540)
06:56:57 at hudson.model.Run.execute(Run.java:1728)
06:56:57 at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
06:56:57 at hudson.model.ResourceController.execute(ResourceController.java:98)
06:56:57 at hudson.model.Executor.run(Executor.java:405)
{noformat}
teilo Please create a bug in https://github.com/stapler/stapler/issues
Stapler is being governed outside the Jenkins org