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https://issues.apache.org/jira/browse/WICKET-4656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13414895#comment-13414895
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Emond Papegaaij edited comment on WICKET-4656 at 7/16/12 7:35 AM:
------------------------------------------------------------------

This seems to be caused by the upgrade to Atmosphere 1.0.0-beta3. I've reported 
an issue ( https://github.com/Atmosphere/atmosphere/issues/513 ). For now, you 
can work around the problem by forcing atmosphere to version 0.9.5 using maven 
dependency management (0.9.6 and 0.9.7 are broken as well).
                
      was (Author: papegaaij):
    This seems to be caused by the upgrade to Atmosphere 1.0.0-beta3. I've 
reported an issue ( https://github.com/Atmosphere/atmosphere/issues/513 ). For 
now, you can work around the problem by forcing atmosphere to version 0.9.7 
using maven dependency management.
                  
> Atmosphere example doesn't work due to missing 'page' when creating 
> AjaxRequestTarget
> -------------------------------------------------------------------------------------
>
>                 Key: WICKET-4656
>                 URL: https://issues.apache.org/jira/browse/WICKET-4656
>             Project: Wicket
>          Issue Type: Bug
>          Components: wicket-atmosphere
>    Affects Versions: 6.0.0-beta3
>            Reporter: Martin Grigorov
>            Assignee: Emond Papegaaij
>
> Testing beta3 revealed this error when trying to use Wicket Atmosphere:
> ERROR - DefaultExceptionMapper     - Unexpected error occurred
> java.lang.IllegalArgumentException: Argument 'page' may not be null.
>       at org.apache.wicket.util.lang.Args.notNull(Args.java:41)
>       at 
> org.apache.wicket.ajax.AjaxRequestHandler.<init>(AjaxRequestHandler.java:111)
>       at 
> org.apache.wicket.protocol.http.WebApplication$DefaultAjaxRequestTargetProvider.get(WebApplication.java:956)
>       at 
> org.apache.wicket.protocol.http.WebApplication$DefaultAjaxRequestTargetProvider.get(WebApplication.java:949)
>       at 
> org.apache.wicket.protocol.http.WebApplication.newAjaxRequestTarget(WebApplication.java:800)
>       at 
> org.apache.wicket.atmosphere.AtmosphereRequestHandler.respond(AtmosphereRequestHandler.java:65)
>       at 
> org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:814)
>       at 
> org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
> ....

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