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Root Cause Analysis

  1. java.lang.IllegalArgumentException

    The argument 'command' must not be null or empty.

    at com.google.common.base.Preconditions.checkArgument()
  2. Guava
    Preconditions.checkArgument
    1. com.google.common.base.Preconditions.checkArgument(Preconditions.java:122)[14:com.google.guava:18.0.0]
    1 frame
  3. org.eclipse.smarthome
    ItemEventFactory.createCommandEvent
    1. org.eclipse.smarthome.core.items.events.ItemEventFactory.assertValidArguments(ItemEventFactory.java:344)[97:org.eclipse.smarthome.core:0.9.0.201609151119]
    2. org.eclipse.smarthome.core.items.events.ItemEventFactory.createCommandEvent(ItemEventFactory.java:186)[97:org.eclipse.smarthome.core:0.9.0.201609151119]
    3. org.eclipse.smarthome.core.items.events.ItemEventFactory.createCommandEvent(ItemEventFactory.java:204)[97:org.eclipse.smarthome.core:0.9.0.201609151119]
    3 frames
  4. org.openhab.io
    HueEmulationServlet.service
    1. org.openhab.io.hueemulation.internal.HueEmulationServlet.apiState(HueEmulationServlet.java:269)[218:org.openhab.io.hueemulation:2.0.0.201609212035]
    2. org.openhab.io.hueemulation.internal.HueEmulationServlet.service(HueEmulationServlet.java:221)[218:org.openhab.io.hueemulation:2.0.0.201609212035]
    2 frames
  5. JavaServlet
    HttpServlet.service
    1. javax.servlet.http.HttpServlet.service(HttpServlet.java:790)[21:javax.servlet-api:3.1.0]
    1 frame
  6. Jetty
    ServletHandler.doHandle
    1. org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)[80:org.eclipse.jetty.servlet:9.2.14.v20151106]
    2. org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:587)[80:org.eclipse.jetty.servlet:9.2.14.v20151106]
    2 frames
  7. OPS4J Pax Web - Jetty
    HttpServiceServletHandler.doHandle
    1. org.ops4j.pax.web.service.jetty.internal.HttpServiceServletHandler.doHandle(HttpServiceServletHandler.java:70)[166:org.ops4j.pax.web.pax-web-jetty:4.2.4]
    1 frame
  8. Jetty
    ContextHandler.doHandle
    1. org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)[79:org.eclipse.jetty.server:9.2.14.v20151106]
    2. org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)[78:org.eclipse.jetty.security:9.2.14.v20151106]
    3. org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)[79:org.eclipse.jetty.server:9.2.14.v20151106]
    4. org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)[79:org.eclipse.jetty.server:9.2.14.v20151106]
    4 frames
  9. OPS4J Pax Web - Jetty
    HttpServiceContext.doHandle
    1. org.ops4j.pax.web.service.jetty.internal.HttpServiceContext.doHandle(HttpServiceContext.java:271)[166:org.ops4j.pax.web.pax-web-jetty:4.2.4]
    1 frame
  10. Jetty
    ScopedHandler.handle
    1. org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)[80:org.eclipse.jetty.servlet:9.2.14.v20151106]
    2. org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)[79:org.eclipse.jetty.server:9.2.14.v20151106]
    3. org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)[79:org.eclipse.jetty.server:9.2.14.v20151106]
    4. org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)[79:org.eclipse.jetty.server:9.2.14.v20151106]
    4 frames
  11. OPS4J Pax Web - Jetty
    JettyServerHandlerCollection.handle
    1. org.ops4j.pax.web.service.jetty.internal.JettyServerHandlerCollection.handle(JettyServerHandlerCollection.java:80)[166:org.ops4j.pax.web.pax-web-jetty:4.2.4]
    1 frame
  12. Jetty
    QueuedThreadPool$3.run
    1. org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)[79:org.eclipse.jetty.server:9.2.14.v20151106]
    2. org.eclipse.jetty.server.Server.handle(Server.java:499)[79:org.eclipse.jetty.server:9.2.14.v20151106]
    3. org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)[79:org.eclipse.jetty.server:9.2.14.v20151106]
    4. org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)[79:org.eclipse.jetty.server:9.2.14.v20151106]
    5. org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)[71:org.eclipse.jetty.io:9.2.14.v20151106]
    6. org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)[82:org.eclipse.jetty.util:9.2.14.v20151106]
    7. org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)[82:org.eclipse.jetty.util:9.2.14.v20151106]
    7 frames
  13. Java RT
    Thread.run
    1. java.lang.Thread.run(Thread.java:745)[:1.8.0_91]
    1 frame