(I'm using Pico 1.0-SNAPSHOT, Pico extras 1.0-alpha-1-SNAPSHOT, WebWork
2.0-beta2 and XWork 1.0-beta2)
I modified PicoActionInvocation to validate my assumptions and did:
public class PicoActionInvocation extends DefaultActionInvocation implements
KeyConstants {
<snip/>
/**
* Copied and adapted from DefaultActionInvocation.createContextMap().
*/
private OgnlValueStack getStackSafely() {
OgnlValueStack stack = getStack();
if (stack != null) return stack;
if ((extraContext != null) &&
(extraContext.containsKey(ActionContext.VALUE_STACK))) {
stack = (OgnlValueStack)
extraContext.get(ActionContext.VALUE_STACK);
if (stack == null) {
throw new IllegalStateException("There was a null Stack set
into the extra params.");
}
} else {
// create the value stack
// this also adds the ValueStack to its context
stack = new OgnlValueStack();
}
// put extraContext in
if (extraContext != null) {
stack.getContext().putAll(extraContext);
}
return stack;
}
private MutablePicoContainer getParentContainer() {
HttpServletRequest request = (HttpServletRequest)
getStackSafely().getContext().get(WebWorkStatics.HTTP_REQUEST);
ObjectReference ref = new RequestScopeObjectReference(request,
REQUEST_CONTAINER);
return (MutablePicoContainer) ref.get();
}
}
With the above hack, it works. The clean way IMHO would be to break down
createContextMap() in DefaultActionInvocation
so that we have a way in PicoActionInvocation to get (and create if
necessary) the stack without populating the context. Anyway...
Still when the web container shuts down (I use tomcat 4.1.29), I get another
exception:
java.lang.RuntimeException: Cannot shutdown container
at
org.picoextras.integrationkit.DefaultLifecycleContainerBuilder.killContainer
(DefaultLifecycleContainerBuilder.java:57)
at
org.picoextras.servlet.ServletContainerListener.sessionDestroyed(ServletCont
ainerListener.java:74)
at
org.apache.catalina.session.StandardSession.expire(StandardSession.java:659)
at
org.apache.catalina.session.StandardSession.expire(StandardSession.java:608)
at
org.apache.catalina.session.StandardManager.processExpires(StandardManager.j
ava:793)
at
org.apache.catalina.session.StandardManager.run(StandardManager.java:870)
at java.lang.Thread.run(Thread.java:534)
Caused by: java.lang.IllegalStateException: getAttribute: Session already
invalidated
at
org.apache.catalina.session.StandardSession.getAttribute(StandardSession.jav
a:954)
at
org.apache.catalina.session.StandardSessionFacade.getAttribute(StandardSessi
onFacade.java:171)
at
org.picoextras.servlet.SessionScopeObjectReference.get(SessionScopeObjectRef
erence.java:36)
at
org.picoextras.integrationkit.DefaultLifecycleContainerBuilder.killContainer
(DefaultLifecycleContainerBuilder.java:46)
... 6 more
This makes me ask id anybody has successfully used PicoContainer and XWork
together using the Pico integration jars.
Anyone?
Thanks,
Vincent
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Behalf Of Vincent
> Tence
> Sent: Thursday, November 27, 2003 11:45 AM
> To: [EMAIL PROTECTED]
> Subject: [picocontainer-dev] Pico-WW2/XWork integration generates NPE
>
>
> Hi all,
>
> I'm trying to use Pico container in a WW2/XWork environment.
>
> <disclaimer>First experience with both, so I may be facing a trivial
> issue</disclaimer>
>
> I'm getting a NPE in PicoActionInvocation.getParentContainer() because
> getStack() happens to return null.
>
> Here's how I setup my WW2 environment:
>
> - Added a listener for Pico in web.xml:
> <!-- PicoContainer Hook -->
> <listener>
>
> <listener-class>org.picoextras.webwork2.WebWork2ContainerListener<
> /listener-
> class>
> </listener>
>
> - Replaced default WW2 Servlet Dispatcher in web.xml with:
>
> <servlet>
> <servlet-name>webwork</servlet-name>
> <!-- PicoContainer enabled dispatcher -->
>
> <servlet-class>org.picoextras.webwork2.PicoServletDispatcher</serv
> let-class>
> </servlet>
>
> - Defined my ContainerAssembler in web.xml:
>
> <context-param>
> <param-name>assembler</param-name>
> <param-value>mypackage.MyContainerAssembler</param-value>
> </context-param>
>
> So far so good, my assembler is called and sets up the
> PicoContainer (did it
> easy first):
>
> public void assembleContainer(MutablePicoContainer
> mutablePicoContainer,
> String string) {
> mutablePicoContainer.registerComponentImplementation(
> SomeService.class,
> SomeServiceImpl.class);
> }
>
> Now my XWork Action depends on SomeService, but can't be instanciated. It
> seems that the ognl value stack is not ready when
> PicoActionInvocation.getParentContainer() is called, resulting in a NPE.
>
> I looked briefly at the current DefaultActionInvocation code (in
> CVS) and it
> looks like createAction() is called at construction time, before the stack
> is ready. And PicoActionInvocation uses the stack in createAction(). As I
> said, I just starting using both Pico and WW2, so I may be totally
> off-track.
>
>
> Anyone experienced the same problem and can help?
>
> Thanks,
> - Vincent
>
> _______________________________________________
> picocontainer-dev mailing list
> [EMAIL PROTECTED]
> http://lists.codehaus.org/mailman/listinfo/picocontainer-dev
>
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