java.lang.NullPointerException

Jenkins JIRA | Artur Szostak | 4 years ago
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  1. 0

    The trigger mechanism does not seem to work for FTP URLs. I get the following information shown in the URLTrigger log: [URLTrigger] - Poll with a URL Polling started on Apr 4, 2013 9:44:47 AM Polling for the job testjob Looking nodes where the poll can be run. Looking for a node to the restricted label master. Polling on master. Failed to poll URL: java.lang.NullPointerException Skipping URLTrigger initialization. Waiting next schedule Polling complete. Took 8 ms. No changes. I also find the following log messages in the jenkins logs: SEVERE: Severe error on trigger startup null java.lang.NullPointerException at org.jenkinsci.plugins.urltrigger.URLTrigger.getFTPResponse(URLTrigger.java:356) at org.jenkinsci.plugins.urltrigger.URLTrigger.start(URLTrigger.java:299) at org.jenkinsci.lib.xtrigger.AbstractTrigger.start(AbstractTrigger.java:97) at org.jenkinsci.lib.xtrigger.AbstractTrigger.start(AbstractTrigger.java:26) at hudson.model.AbstractProject.submit(AbstractProject.java:1803) at hudson.matrix.MatrixProject.submit(MatrixProject.java:790) at hudson.model.Job.doConfigSubmit(Job.java:993) at hudson.model.AbstractProject.doConfigSubmit(AbstractProject.java:699) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:288) at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:151) at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:90) at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:111) at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53) at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:574) at org.kohsuke.stapler.Stapler.invoke(Stapler.java:659) at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:241) at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53) at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:574) at org.kohsuke.stapler.Stapler.invoke(Stapler.java:659) at org.kohsuke.stapler.Stapler.invoke(Stapler.java:488) at org.kohsuke.stapler.Stapler.service(Stapler.java:162) at javax.servlet.http.HttpServlet.service(HttpServlet.java:45) at winstone.ServletConfiguration.execute(ServletConfiguration.java:248) at winstone.RequestDispatcher.forward(RequestDispatcher.java:333) at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:376) at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:95) at hudson.plugins.greenballs.GreenBallFilter.doFilter(GreenBallFilter.java:58) at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:98) at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:87) at winstone.FilterConfiguration.execute(FilterConfiguration.java:194) at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366) at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:85) at winstone.FilterConfiguration.execute(FilterConfiguration.java:194) at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366) 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 org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:166) 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:173) at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87) at jenkins.security.ApiTokenFilter.doFilter(ApiTokenFilter.java:64) 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:66) at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87) at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76) at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164) at winstone.FilterConfiguration.execute(FilterConfiguration.java:194) at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366) at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:50) at winstone.FilterConfiguration.execute(FilterConfiguration.java:194) at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366) at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81) at winstone.FilterConfiguration.execute(FilterConfiguration.java:194) at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366) at winstone.RequestDispatcher.forward(RequestDispatcher.java:331) at winstone.RequestHandlerThread.processRequest(RequestHandlerThread.java:227) at winstone.RequestHandlerThread.run(RequestHandlerThread.java:150) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:619)

    Jenkins JIRA | 4 years ago | Artur Szostak
    java.lang.NullPointerException
  2. 0

    The trigger mechanism does not seem to work for FTP URLs. I get the following information shown in the URLTrigger log: [URLTrigger] - Poll with a URL Polling started on Apr 4, 2013 9:44:47 AM Polling for the job testjob Looking nodes where the poll can be run. Looking for a node to the restricted label master. Polling on master. Failed to poll URL: java.lang.NullPointerException Skipping URLTrigger initialization. Waiting next schedule Polling complete. Took 8 ms. No changes. I also find the following log messages in the jenkins logs: SEVERE: Severe error on trigger startup null java.lang.NullPointerException at org.jenkinsci.plugins.urltrigger.URLTrigger.getFTPResponse(URLTrigger.java:356) at org.jenkinsci.plugins.urltrigger.URLTrigger.start(URLTrigger.java:299) at org.jenkinsci.lib.xtrigger.AbstractTrigger.start(AbstractTrigger.java:97) at org.jenkinsci.lib.xtrigger.AbstractTrigger.start(AbstractTrigger.java:26) at hudson.model.AbstractProject.submit(AbstractProject.java:1803) at hudson.matrix.MatrixProject.submit(MatrixProject.java:790) at hudson.model.Job.doConfigSubmit(Job.java:993) at hudson.model.AbstractProject.doConfigSubmit(AbstractProject.java:699) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:288) at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:151) at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:90) at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:111) at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53) at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:574) at org.kohsuke.stapler.Stapler.invoke(Stapler.java:659) at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:241) at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53) at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:574) at org.kohsuke.stapler.Stapler.invoke(Stapler.java:659) at org.kohsuke.stapler.Stapler.invoke(Stapler.java:488) at org.kohsuke.stapler.Stapler.service(Stapler.java:162) at javax.servlet.http.HttpServlet.service(HttpServlet.java:45) at winstone.ServletConfiguration.execute(ServletConfiguration.java:248) at winstone.RequestDispatcher.forward(RequestDispatcher.java:333) at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:376) at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:95) at hudson.plugins.greenballs.GreenBallFilter.doFilter(GreenBallFilter.java:58) at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:98) at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:87) at winstone.FilterConfiguration.execute(FilterConfiguration.java:194) at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366) at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:85) at winstone.FilterConfiguration.execute(FilterConfiguration.java:194) at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366) 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 org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:166) 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:173) at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87) at jenkins.security.ApiTokenFilter.doFilter(ApiTokenFilter.java:64) 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:66) at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87) at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76) at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164) at winstone.FilterConfiguration.execute(FilterConfiguration.java:194) at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366) at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:50) at winstone.FilterConfiguration.execute(FilterConfiguration.java:194) at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366) at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81) at winstone.FilterConfiguration.execute(FilterConfiguration.java:194) at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366) at winstone.RequestDispatcher.forward(RequestDispatcher.java:331) at winstone.RequestHandlerThread.processRequest(RequestHandlerThread.java:227) at winstone.RequestHandlerThread.run(RequestHandlerThread.java:150) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:619)

    Jenkins JIRA | 4 years ago | Artur Szostak
    java.lang.NullPointerException

    Root Cause Analysis

    1. java.lang.NullPointerException

      No message provided

      at org.jenkinsci.plugins.urltrigger.URLTrigger.getFTPResponse()
    2. org.jenkinsci.plugins
      URLTrigger.start
      1. org.jenkinsci.plugins.urltrigger.URLTrigger.getFTPResponse(URLTrigger.java:356)
      2. org.jenkinsci.plugins.urltrigger.URLTrigger.start(URLTrigger.java:299)
      2 frames
    3. org.jenkinsci.lib
      AbstractTrigger.start
      1. org.jenkinsci.lib.xtrigger.AbstractTrigger.start(AbstractTrigger.java:97)
      2. org.jenkinsci.lib.xtrigger.AbstractTrigger.start(AbstractTrigger.java:26)
      2 frames
    4. Hudson
      AbstractProject.doConfigSubmit
      1. hudson.model.AbstractProject.submit(AbstractProject.java:1803)
      2. hudson.matrix.MatrixProject.submit(MatrixProject.java:790)
      3. hudson.model.Job.doConfigSubmit(Job.java:993)
      4. hudson.model.AbstractProject.doConfigSubmit(AbstractProject.java:699)
      4 frames
    5. Java RT
      Method.invoke
      1. sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      2. sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
      3. sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      4. java.lang.reflect.Method.invoke(Method.java:597)
      4 frames
    6. Stapler
      Stapler.service
      1. org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:288)
      2. org.kohsuke.stapler.Function.bindAndInvoke(Function.java:151)
      3. org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:90)
      4. org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:111)
      5. org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
      6. org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:574)
      7. org.kohsuke.stapler.Stapler.invoke(Stapler.java:659)
      8. org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:241)
      9. org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
      10. org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:574)
      11. org.kohsuke.stapler.Stapler.invoke(Stapler.java:659)
      12. org.kohsuke.stapler.Stapler.invoke(Stapler.java:488)
      13. org.kohsuke.stapler.Stapler.service(Stapler.java:162)
      13 frames
    7. JavaServlet
      HttpServlet.service
      1. javax.servlet.http.HttpServlet.service(HttpServlet.java:45)
      1 frame
    8. winstone
      RequestDispatcher.doFilter
      1. winstone.ServletConfiguration.execute(ServletConfiguration.java:248)
      2. winstone.RequestDispatcher.forward(RequestDispatcher.java:333)
      3. winstone.RequestDispatcher.doFilter(RequestDispatcher.java:376)
      3 frames
    9. Hudson
      PluginServletFilter$1.doFilter
      1. hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:95)
      1 frame
    10. hudson.plugins.greenballs
      GreenBallFilter.doFilter
      1. hudson.plugins.greenballs.GreenBallFilter.doFilter(GreenBallFilter.java:58)
      1 frame
    11. Hudson
      PluginServletFilter.doFilter
      1. hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:98)
      2. hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:87)
      2 frames
    12. winstone
      RequestDispatcher.doFilter
      1. winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
      2. winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
      2 frames
    13. Hudson
      CrumbFilter.doFilter
      1. hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:85)
      1 frame
    14. winstone
      RequestDispatcher.doFilter
      1. winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
      2. winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
      2 frames
    15. Hudson
      ChainedServletFilter$1.doFilter
      1. hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
      2. hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)
      3. hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
      3 frames
    16. Acegi Security Core
      ExceptionTranslationFilter.doFilter
      1. org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:166)
      1 frame
    17. Hudson
      ChainedServletFilter$1.doFilter
      1. hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
      1 frame
    18. Acegi Security Core
      AnonymousProcessingFilter.doFilter
      1. org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
      1 frame
    19. Hudson
      ChainedServletFilter$1.doFilter
      1. hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
      1 frame
    20. Acegi Security Core
      RememberMeProcessingFilter.doFilter
      1. org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142)
      1 frame
    21. Hudson
      ChainedServletFilter$1.doFilter
      1. hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
      1 frame
    22. Acegi Security Core
      AbstractProcessingFilter.doFilter
      1. org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)
      1 frame
    23. Hudson
      ChainedServletFilter$1.doFilter
      1. hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
      1 frame
    24. Acegi Security Core
      BasicProcessingFilter.doFilter
      1. org.acegisecurity.ui.basicauth.BasicProcessingFilter.doFilter(BasicProcessingFilter.java:173)
      1 frame
    25. Hudson
      ChainedServletFilter$1.doFilter
      1. hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
      1 frame
    26. jenkins.security
      ApiTokenFilter.doFilter
      1. jenkins.security.ApiTokenFilter.doFilter(ApiTokenFilter.java:64)
      1 frame
    27. Hudson
      ChainedServletFilter$1.doFilter
      1. hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
      1 frame
    28. Acegi Security Core
      HttpSessionContextIntegrationFilter.doFilter
      1. org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
      1 frame
    29. Hudson
      HudsonFilter.doFilter
      1. hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:66)
      2. hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
      3. hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
      4. hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)
      4 frames
    30. winstone
      RequestDispatcher.doFilter
      1. winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
      2. winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
      2 frames
    31. Stapler
      CompressionFilter.doFilter
      1. org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:50)
      1 frame
    32. winstone
      RequestDispatcher.doFilter
      1. winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
      2. winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
      2 frames
    33. Hudson
      CharacterEncodingFilter.doFilter
      1. hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)
      1 frame
    34. winstone
      RequestHandlerThread.run
      1. winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
      2. winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
      3. winstone.RequestDispatcher.forward(RequestDispatcher.java:331)
      4. winstone.RequestHandlerThread.processRequest(RequestHandlerThread.java:227)
      5. winstone.RequestHandlerThread.run(RequestHandlerThread.java:150)
      5 frames
    35. Java RT
      FutureTask.run
      1. java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
      2. java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
      3. java.util.concurrent.FutureTask.run(FutureTask.java:138)
      3 frames
    36. winstone
      BoundedExecutorService$1.run
      1. winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
      1 frame
    37. Java RT
      Thread.run
      1. java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
      2. java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
      3. java.lang.Thread.run(Thread.java:619)
      3 frames