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Specifically, here's the stack trace I got when I entered '0' in the "# of executors" field for a node and clicked 'Save':
javax.servlet.ServletException: java.lang.RuntimeException: Failed to instantiate class hudson.slaves.DumbSlave from {"name":"x.y.example.com","nodeDescription":"","numExecutors":"0","remoteFS":"/scratch/jenkins","labelString":"linux-disabled precise-disabled","mode":"EXCLUSIVE","":["hudson.plugins.sshslaves.SSHLauncher","hudson.slaves.RetentionStrategy$Always"],"launcher":{"stapler-class":"hudson.plugins.sshslaves.SSHLauncher","host":"x.y.example.com","credentialsId":"903329e1-fb79-4a0b-ac9d-7699266e65f6","port":"22","javaPath":"","jvmOptions":"","prefixStartSlaveCmd":"","suffixStartSlaveCmd":"","launchTimeoutSeconds":"","maxNumRetries":"0","retryWaitTime":"0"},"retentionStrategy":{"stapler-class":"hudson.slaves.RetentionStrategy$Always"},"nodeProperties":{"stapler-class-bag":"true"}} at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:783) at org.kohsuke.stapler.Stapler.invoke(Stapler.java:863) at org.kohsuke.stapler.MetaClass$12.dispatch(MetaClass.java:390) at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:733) at org.kohsuke.stapler.Stapler.invoke(Stapler.java:863) at org.kohsuke.stapler.MetaClass$4.doDispatch(MetaClass.java:210) at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53) at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:733) at org.kohsuke.stapler.Stapler.invoke(Stapler.java:863) at org.kohsuke.stapler.Stapler.invoke(Stapler.java:636) at org.kohsuke.stapler.Stapler.service(Stapler.java:225) at javax.servlet.http.HttpServlet.service(HttpServlet.java:848) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:686) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1494) at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:96) at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:198) at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:176) at net.bull.javamelody.PluginMonitoringFilter.doFilter(PluginMonitoringFilter.java:85) at org.jvnet.hudson.plugins.monitoring.HudsonMonitoringFilter.doFilter(HudsonMonitoringFilter.java:97) at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:99) at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:88) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482) at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:48) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482) at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84) at hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51) at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87) at jenkins.security.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:117) at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87) at org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125) at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87) at org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142) at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87) at org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271) at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87) at org.acegisecurity.ui.basicauth.BasicProcessingFilter.doFilter(BasicProcessingFilter.java:174) at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87) at jenkins.security.ApiTokenFilter.doFilter(ApiTokenFilter.java:74) at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87) at org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249) at hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:67) at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87) at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76) at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482) at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:46) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482) at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1474) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:499) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:533) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116) at org.eclipse.jetty.server.Server.handle(Server.java:370) at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489) at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:960) at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1021) at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865) at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240) at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82) at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:668) at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52) at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:701) Caused by: java.lang.RuntimeException: Failed to instantiate class hudson.slaves.DumbSlave from {"name":"x.y.example.com","nodeDescription":"","numExecutors":"0","remoteFS":"/scratch/jenkins","labelString":"linux-disabled precise-disabled","mode":"EXCLUSIVE","":["hudson.plugins.sshslaves.SSHLauncher","hudson.slaves.RetentionStrategy$Always"],"launcher":{"stapler-class":"hudson.plugins.sshslaves.SSHLauncher","host":"x.y.example.com","credentialsId":"903329e1-fb79-4a0b-ac9d-7699266e65f6","port":"22","javaPath":"","jvmOptions":"","prefixStartSlaveCmd":"","suffixStartSlaveCmd":"","launchTimeoutSeconds":"","maxNumRetries":"0","retryWaitTime":"0"},"retentionStrategy":{"stapler-class":"hudson.slaves.RetentionStrategy$Always"},"nodeProperties":{"stapler-class-bag":"true"}} at hudson.model.Descriptor.newInstance(Descriptor.java:576) at hudson.model.Node.reconfigure(Node.java:446) at hudson.model.Computer.doConfigSubmit(Computer.java:1181) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:622) at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:298) at org.kohsuke.stapler.interceptor.RequirePOST$Processor.invoke(RequirePOST.java:46) at org.kohsuke.stapler.Function$InterceptedFunction.invoke(Function.java:399) at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:161) at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:96) at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:120) at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53) at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:733) ... 71 more Caused by: java.lang.IllegalArgumentException: Failed to instantiate class hudson.slaves.DumbSlave from {"name":"x.y.example.com","nodeDescription":"","numExecutors":"0","remoteFS":"/scratch/jenkins","labelString":"linux-disabled precise-disabled","mode":"EXCLUSIVE","":["hudson.plugins.sshslaves.SSHLauncher","hudson.slaves.RetentionStrategy$Always"],"launcher":{"stapler-class":"hudson.plugins.sshslaves.SSHLauncher","host":"x.y.example.com","credentialsId":"903329e1-fb79-4a0b-ac9d-7699266e65f6","port":"22","javaPath":"","jvmOptions":"","prefixStartSlaveCmd":"","suffixStartSlaveCmd":"","launchTimeoutSeconds":"","maxNumRetries":"0","retryWaitTime":"0"},"retentionStrategy":{"stapler-class":"hudson.slaves.RetentionStrategy$Always"},"nodeProperties":{"stapler-class-bag":"true"}} at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:589) at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:400) at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:396) at hudson.model.Descriptor.newInstance(Descriptor.java:567) ... 85 more Caused by: java.lang.IllegalArgumentException: hudson.model.Descriptor$FormException: Invalid slave configuration for x.y.example.com. Invalid # of executors. at org.kohsuke.stapler.RequestImpl.invokeConstructor(RequestImpl.java:462) at org.kohsuke.stapler.RequestImpl.instantiate(RequestImpl.java:690) at org.kohsuke.stapler.RequestImpl.access$100(RequestImpl.java:81) at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:587) ... 88 more Caused by: hudson.model.Descriptor$FormException: Invalid slave configuration for x.y.example.com. Invalid # of executors. at hudson.model.Slave.<init>(Slave.java:179) at hudson.model.Slave.<init>(Slave.java:138) at hudson.slaves.DumbSlave.<init>(DumbSlave.java:53) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:534) at org.kohsuke.stapler.RequestImpl.invokeConstructor(RequestImpl.java:447) ... 91 more