NPE when clicking free memory in Status Page after config reload
----------------------------------------------------------------

                 Key: GEOS-4468
                 URL: http://jira.codehaus.org/browse/GEOS-4468
             Project: GeoServer
          Issue Type: Bug
          Components: Wicket UI
            Reporter: Gabriel Roldán
            Assignee: Andrea Aime


Got this on trunk:
- go to status page
- hit reload config
- hit free memory
Got:
{code}
06 Apr 16:21:46 ERROR [org.apache.wicket.RequestCycle] - Method onLinkClicked 
of interface org.apache.wicket.markup.html.link.ILinkListener 
targeted at component [MarkupContainer [Component id = free.memory.jai]] threw 
an exception
org.apache.wicket.WicketRuntimeException: Method onLinkClicked of interface 
org.apache.wicket.markup.html.link.ILinkListener
 targeted at component [MarkupContainer [Component id = free.memory.jai]] threw 
an exception
        at 
org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:193)
.........
Caused by: java.lang.reflect.InvocationTargetException
        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.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:182)
        ... 141 more
Caused by: java.lang.NullPointerException
        at org.geoserver.web.admin.StatusPage$3.onClick(StatusPage.java:122)
        at org.apache.wicket.markup.html.link.Link.onLinkClicked(Link.java:224)
        ... 146 more
{code}

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