On 20-03-2009 16:41, Francesco Chicchiriccò wrote:
[...]
The problem with Glassfish was quite silly, and also the current
solution I've implemented is silly as well ;-)
As you can remember, the NullPointerException at
nl.hippo.cms.workflow.DashboardWorkflowQueriesGenerator.generate(DashboardWorkflowQueriesGenerator.java:44)
or
nl.hippo.cms.workflow.AvailableActionsGenerator.java(AvailableActionsGenerator.java:96)
was related to the fact that the AvalonSpringBridge instance did not
contain the "serverManager" bean.
Spending much time on debugging, I finally went to the
AvalonSpringBridgeImpl and MultipleXmlContextLoader /
MultipleXmlContextLoaderServlet; I finally could notice that the call to
AvalonSpringBridge always occurred *before* the initialization in
MultipleXmlContextLoader / MultipleXmlContextLoaderServlet took place.
I went to the web.xml and I found that this servlet had
<load-on-startup>0</load-on-startup>.
As you can read in [1], under issue 6172006, for Glassfish 2.1,
<load-on-startup>0</load-on-startup> in web.xml means that servlet load
order does not matter. Thus, I tried to change that value, with no success.
To solve this initialization order issue:
* I added at the very beginning of
MultipleXmlContextLoader.initWebApplicationContext() the following
code:
synchronized (this) {
Object wacAsObject =
servletContext.getAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE);
if (wacAsObject != null && wacAsObject instanceof
WebApplicationContext)
return (WebApplicationContext) wacAsObject;
}
* I modified AvalonSpringBridgeImpl.service() so that, when trying
to get
WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE from
context, if null, it instantiates the (modified)
MultipleXmlContextLoader and then call
MultipleXmlContextLoader.initWebApplicationContext()
Using this approach, the first call that occurs, either from the servlet
or from the AvalonSprinBridge, will do the right initialization.
Now the application is working correctly in Glassfish 2.1 / Sun
Application Server 9.11.
Was my approach correct when solving the issue? Is there anything else -
simpler or cleaner - to achieve the same result?
Thanks.
[1] http://docs.sun.com/app/docs/doc/820-4329/gawlb?a=view
--
Francesco Chicchiriccò
Delivery Manager
everett Italia ?
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