Hendy Irawan created WICKET-5323:
------------------------------------

             Summary: During EventBus.post() from non-Wicket thread: an error 
occurred while generating an Url for handler at 
o.a.w.request.cycle.RequestCycle.urlFor()
                 Key: WICKET-5323
                 URL: https://issues.apache.org/jira/browse/WICKET-5323
             Project: Wicket
          Issue Type: Bug
          Components: wicket-atmosphere
    Affects Versions: 6.10.0
         Environment: wicket-atmosphere 0.11, WebSockets protocol
            Reporter: Hendy Irawan
            Assignee: Emond Papegaaij


When AtmosphereEventBus.post() is called from a non-Wicket thread (and no web 
request), it fails with the following, due to NullPointerException: null at 
org.apache.wicket.protocol.http.servlet.ServletWebRequest.getContextRelativeUrl()

{code}
2013-08-22 08:48:30.656
04:49:23.551 | ERROR | oryBean_Worker-7 | o.a.w.DefaultExceptionMapper     | 
he.wicket.DefaultExceptionMapper  123 | Unexpected error occurred
org.apache.wicket.WicketRuntimeException: An error occurred while generating an 
Url for handler 
'org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler@6f93daec'
        at 
org.apache.wicket.request.cycle.RequestCycle.urlFor(RequestCycle.java:535) 
[wicket-core-6.10.0.jar:6.10.0]
        at org.apache.wicket.Component.urlFor(Component.java:3347) 
~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.behavior.AbstractAjaxBehavior.getCallbackUrl(AbstractAjaxBehavior.java:88)
 ~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.ajax.AbstractDefaultAjaxBehavior.renderAjaxAttributes(AbstractDefaultAjaxBehavior.java:223)
 ~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.ajax.AbstractDefaultAjaxBehavior.renderAjaxAttributes(AbstractDefaultAjaxBehavior.java:207)
 ~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.ajax.AbstractDefaultAjaxBehavior.getCallbackScript(AbstractDefaultAjaxBehavior.java:457)
 ~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.ajax.AjaxEventBehavior.renderHead(AjaxEventBehavior.java:83) 
~[wicket-core-6.10.0.jar:6.10.0]
        at org.apache.wicket.Component.renderHead(Component.java:2714) 
~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.markup.renderStrategy.ChildFirstHeaderRenderStrategy$1.component(ChildFirstHeaderRenderStrategy.java:85)
 ~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.markup.renderStrategy.DeepChildFirstVisitor.visit(DeepChildFirstVisitor.java:96)
 ~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.markup.renderStrategy.DeepChildFirstVisitor.visit(DeepChildFirstVisitor.java:87)
 ~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.markup.renderStrategy.DeepChildFirstVisitor.visit(DeepChildFirstVisitor.java:87)
 ~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.markup.renderStrategy.DeepChildFirstVisitor.visit(DeepChildFirstVisitor.java:87)
 ~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.markup.renderStrategy.DeepChildFirstVisitor.visit(DeepChildFirstVisitor.java:87)
 ~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.markup.renderStrategy.DeepChildFirstVisitor.visit(DeepChildFirstVisitor.java:87)
 ~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.markup.renderStrategy.DeepChildFirstVisitor.visit(DeepChildFirstVisitor.java:87)
 ~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.markup.renderStrategy.DeepChildFirstVisitor.visit(DeepChildFirstVisitor.java:87)
 ~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.markup.renderStrategy.DeepChildFirstVisitor.visit(DeepChildFirstVisitor.java:87)
 ~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.markup.renderStrategy.DeepChildFirstVisitor.visit(DeepChildFirstVisitor.java:87)
 ~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.markup.renderStrategy.DeepChildFirstVisitor.visit(DeepChildFirstVisitor.java:51)
 ~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.markup.renderStrategy.ChildFirstHeaderRenderStrategy.renderChildHeaders(ChildFirstHeaderRenderStrategy.java:78)
 ~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.markup.renderStrategy.ChildFirstHeaderRenderStrategy.renderHeader(ChildFirstHeaderRenderStrategy.java:57)
 ~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.ajax.AbstractAjaxResponse.writeHeaderContribution(AbstractAjaxResponse.java:464)
 ~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.ajax.XmlAjaxResponse.writeComponent(XmlAjaxResponse.java:110) 
~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.ajax.AbstractAjaxResponse.writeComponents(AbstractAjaxResponse.java:213)
 ~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.ajax.AbstractAjaxResponse.writeTo(AbstractAjaxResponse.java:145)
 ~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.ajax.AjaxRequestHandler.respond(AjaxRequestHandler.java:359) 
~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:861)
 ~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
 ~[wicket-request-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:97)
 ~[wicket-request-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:261) 
[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:218)
 [wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:289)
 [wicket-core-6.10.0.jar:6.10.0]
        at org.apache.wicket.atmosphere.EventBus.post(EventBus.java:341) 
~[wicket-atmosphere-0.11.jar:0.11]
        at 
org.apache.wicket.atmosphere.EventBus.postToSingleResource(EventBus.java:317) 
~[wicket-atmosphere-0.11.jar:0.11]
        at org.apache.wicket.atmosphere.EventBus.post(EventBus.java:292) 
~[wicket-atmosphere-0.11.jar:0.11]
        at 
org.soluvas.web.site.AtmosphereApplication.bridgeToAtmosphere(AtmosphereApplication.java:53)
 ~[org.soluvas.web.site-2.1.0-SNAPSHOT.jar:na]
        at sun.reflect.GeneratedMethodAccessor73.invoke(Unknown Source) ~[na:na]
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 ~[na:1.7.0_25]
        at java.lang.reflect.Method.invoke(Method.java:606) ~[na:1.7.0_25]
        at 
com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74) 
~[guava-14.0.1.jar:na]
        at 
com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
 ~[guava-14.0.1.jar:na]
        at com.google.common.eventbus.EventBus.dispatch(EventBus.java:314) 
~[guava-14.0.1.jar:na]
        at 
com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296) 
~[guava-14.0.1.jar:na]
        at com.google.common.eventbus.EventBus.post(EventBus.java:267) 
~[guava-14.0.1.jar:na]
        at 
com.quikdo.freq.job.EventBusJobListener.jobWasExecuted(EventBusJobListener.java:54)
 ~[EventBusJobListener.class:na]
        at 
org.quartz.core.QuartzScheduler.notifyJobListenersWasExecuted(QuartzScheduler.java:2020)
 ~[quartz-2.2.0.jar:na]
        at 
org.quartz.core.JobRunShell.notifyJobListenersComplete(JobRunShell.java:355) 
~[quartz-2.2.0.jar:na]
        at org.quartz.core.JobRunShell.run(JobRunShell.java:229) 
~[quartz-2.2.0.jar:na]
        at 
org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:560) 
~[quartz-2.2.0.jar:na]
Caused by: java.lang.NullPointerException: null
        at 
org.apache.wicket.protocol.http.servlet.ServletWebRequest.getContextRelativeUrl(ServletWebRequest.java:194)
 ~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.protocol.http.servlet.ServletWebRequest.getClientUrl(ServletWebRequest.java:148)
 ~[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.atmosphere.AtmosphereWebRequest.getClientUrl(AtmosphereWebRequest.java:112)
 ~[wicket-atmosphere-0.11.jar:0.11]
        at 
org.apache.wicket.request.UrlRenderer.shouldRenderAsFull(UrlRenderer.java:354) 
~[wicket-request-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.request.UrlRenderer.renderUrl(UrlRenderer.java:100) 
~[wicket-request-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.request.cycle.RequestCycle.renderUrl(RequestCycle.java:548) 
[wicket-core-6.10.0.jar:6.10.0]
        at 
org.apache.wicket.request.cycle.RequestCycle.urlFor(RequestCycle.java:530) 
[wicket-core-6.10.0.jar:6.10.0]
        ... 49 common frames omitted

        at 
org.apache.wicket.DefaultExceptionMapper.internalMap(DefaultExceptionMapper.java:123)
        at 
org.apache.wicket.DefaultExceptionMapper.map(DefaultExceptionMapper.java:62)
        at 
org.apache.wicket.request.cycle.RequestCycle.handleException(RequestCycle.java:352)
        at 
org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:229)
        at 
org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:289)
        at org.apache.wicket.atmosphere.EventBus.post(EventBus.java:341)
        at 
org.apache.wicket.atmosphere.EventBus.postToSingleResource(EventBus.java:317)
        at org.apache.wicket.atmosphere.EventBus.post(EventBus.java:292)
{code}

Note that although there is no web request, the Atmosphere EventBus.post() 
should still work.

Also FYI, not sure if this helps, a WebSocket request scheme is "WebSocket", 
not "http" nor "http".

Related to WICKET-5134, WICKET-5084, WICKET-5280.

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