java.lang.NullPointerException

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    http 503 error gwt jetty server SERVICE_UNAVAILABLE

    Stack Overflow | 4 years ago | Pero
    java.lang.NullPointerException

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    Root Cause Analysis

    1. java.lang.NullPointerException

      No message provided

      at java.lang.Class.isAssignableFrom()
    2. Java RT
      Class.isAssignableFrom
      1. java.lang.Class.isAssignableFrom(Native Method)
      1 frame
    3. Jetty Server
      ServletHolder.doStart
      1. org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:256)
      1 frame
    4. Jetty Util
      AbstractLifeCycle.start
      1. org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
      1 frame
    5. Jetty Server
      WebAppContext.doStart
      1. org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:685)
      2. org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
      3. org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250)
      4. org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517)
      5. org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467)
      5 frames
    6. Jetty Util
      AbstractLifeCycle.start
      1. org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
      1 frame
    7. Jetty Server
      HandlerWrapper.doStart
      1. org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
      1 frame
    8. Jetty Util
      AbstractLifeCycle.start
      1. org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
      1 frame
    9. Jetty Server
      Server.doStart
      1. org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
      2. org.mortbay.jetty.Server.doStart(Server.java:224)
      2 frames
    10. Jetty Util
      AbstractLifeCycle.start
      1. org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
      1 frame
    11. AppEngine Testing
      DevAppServerImpl.start
      1. com.google.appengine.tools.development.JettyContainerService.startContainer(JettyContainerService.java:185)
      2. com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java:149)
      3. com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:219)
      3 frames
    12. com.google.appengine
      AppEngineLauncher.start
      1. com.google.appengine.tools.development.gwt.AppEngineLauncher.start(AppEngineLauncher.java:119)
      1 frame
    13. GWT dev
      DevMode.main
      1. com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:431)
      2. com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1053)
      3. com.google.gwt.dev.DevModeBase.run(DevModeBase.java:795)
      4. com.google.gwt.dev.DevMode.main(DevMode.java:282)
      4 frames