The plugin has been broken for months now with this issue: https://github.com/jenkinsci/slack-plugin/issues/191
> On 22.07.2016, at 11:32, yohanes marthin Hutabarat > <[email protected]> wrote: > > Hello guys, > I'm new with Jenkins. > I am trying to create master-slave jobs with slave on VM. > But when I create a new node it told me that slaveAgentPort.disabled, and > when I'm trying to access the security configuration error, it show an error > like below stack trace. > Do you guys have any solution about this? > Thank you! > > javax.servlet.ServletException: java.lang.NullPointerException > at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:796) > at org.kohsuke.stapler.Stapler.invoke(Stapler.java:876) > at org.kohsuke.stapler.Stapler.invoke(Stapler.java:649) > at org.kohsuke.stapler.Stapler.service(Stapler.java:238) > at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) > at > org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812) > at > org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1669) > at > hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:135) > at > hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:126) > at > org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652) > at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:86) > at > org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652) > 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 > jenkins.security.BasicHeaderProcessor.doFilter(BasicHeaderProcessor.java:93) > 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$1.doFilter(ChainedServletFilter.java:87) > at > hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76) > at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:171) > at > org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652) > at > org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:49) > at > org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652) > at > hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:82) > at > org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652) > at > org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30) > at > org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652) > at > org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585) > at > org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) > at > org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:553) > at > org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223) > at > org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127) > at > org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515) > at > org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185) > at > org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061) > at > org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) > at > org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97) > at org.eclipse.jetty.server.Server.handle(Server.java:499) > at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311) > at > org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257) > at > org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544) > at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77) > at > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) > at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) > at java.lang.Thread.run(Thread.java:745) > Caused by: java.lang.NullPointerException > at > jenkins.plugins.slack.webhook.WebhookEndpoint.getUrlName(WebhookEndpoint.java:51) > at jenkins.model.Jenkins.getDynamic(Jenkins.java:3344) > at sun.reflect.GeneratedMethodAccessor220.invoke(Unknown Source) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) > at java.lang.reflect.Method.invoke(Method.java:498) > at > org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:324) > at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:167) > at org.kohsuke.stapler.MetaClass$11.dispatch(MetaClass.java:378) > at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:746) > ... 54 more > > > -- > You 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