This is because ApplicationStateManager requires that the WebRequest in
RequestGlobals is set, but it doesn't normally get set until the
terminator of the filter chain.
In order to get around this, I usually inject the RequestGlobals service
into my filter and add these lines at the beginning of the service
method:
if ( requestGlobals.getWebRequest() == null )
requestGlobals.store( request, response
);
Hope this helps,
jeff
-----Original Message-----
From: karthik G [mailto:[EMAIL PROTECTED]
Sent: Wednesday, January 03, 2007 8:40 PM
To: Tapestry users
Subject: Error when accessing ApplicationStateManager in
WebRequestServicerFilter
I wrote my custom filter that implements WebRequestServicerFilter - In
my filter am looking up ApplicationStatemanager to determine if a
session object exists.
<service-point id="CustomServicerFilter" interface="
org.apache.tapestry.services.WebRequestServicerFilter">
<invoke-factory>
<construct class="
com.sgt.framework.tapestry.CustomWebRequestServicerFilter">
<set-object property="applicationStateManager"
value="service:tapestry.state.ApplicationStateManager"/>
</construct>
</invoke-factory>
</service-point>
<contribution configuration-id="
tapestry.request.WebRequestServicerPipeline">
<filter name="CustomServicerFilter"
object="service:CustomServicerFilter" />
</contribution>
public class CustomWebRequestServicerFilter implements
WebRequestServicerFilter {
public void service(WebRequest request, WebResponse response,
WebRequestServicer servicer) throws IOException {
if (applicationStateManager != null){
log.debug("\n\n+++++++ User object exists? --> "
+ applicationStateManager.exists("user")); ......(1)
}
}
I get an error at line 1 when i invoke the 'exists( )' method.
java.lang.NullPointerException: Property 'webRequest' of <OuterProxy for
tapestry.globals.RequestGlobals(org.apache.tapestry.services.RequestGlob
als)>
is null.
at
$WebRequest_10feb506bfc._targetServiceProperty($WebRequest_10feb506bfc.j
ava)
at $WebRequest_10feb506bfc.getSession($WebRequest_10feb506bfc.java)
at $WebRequest_10feb506bba.getSession($WebRequest_10feb506bba.java)
at $WebRequest_10feb506bb9.getSession($WebRequest_10feb506bb9.java)
at org.apache.tapestry.engine.state.SessionScopeManager.exists(
SessionScopeManager.java:53)
at
$StateObjectPersistenceManager_10feb506bfb.exists($StateObjectPersistenc
eManager_10feb506bfb.java)
at
$StateObjectPersistenceManager_10feb506bfa.exists($StateObjectPersistenc
eManager_10feb506bfa.java)
at org.apache.tapestry.engine.state.StateObjectManagerImpl.exists(
StateObjectManagerImpl.java:45)
at
org.apache.tapestry.engine.state.ApplicationStateManagerImpl.exists(
ApplicationStateManagerImpl.java:51)
at
$ApplicationStateManager_10feb506b8f.exists($ApplicationStateManager_10f
eb506b8f.java)
at
$ApplicationStateManager_10feb506b90.exists($ApplicationStateManager_10f
eb506b90.java)
at
com.xyz.framework.tapestry.CustomWebRequestServicerFilter.service(
CustomWebRequestServicerFilter.java:73)
I just want to look up a session object. I realize that i have access to
WebRequest and from there i can get to HttpSession and do a attribute
name look up. But I think that would amount to by-passing tapestry.
moreover I dont know the *exact* key that tapestry uses to store the
object in session (the ones i inject through @InjectState).
thanks,
Karthik
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