ResourceManager : unable to find resource ...

[otisg <ot...@ureach.com>]

Hello,

I am trying to use the regular Struts Action servlet along
VelocityViewServlet.  The former mapped to *.do, the latter to
*.vm requests.  I am observing some strange behaviour:

1. Request to http://.../Action.vm give me an error:

VelocityServlet : Error processing the template
org.apache.velocity.exception.ResourceNotFoundException: Unable
to find resource '/Home.vm'
....
And I see this in the error log:
Velocity  [error] ResourceManager : unable to find resource
'/Home.vm' in any resource loader.

2. Request to http://.../Action.do _does_ work _but_ seems to
use Velocity classes.  That is strange, because I have .do
mapped to Struts Action servlet, and _not_ VelocityViewServlet.
Weird, no?
The reason I see that .do is handled by Velocity classes is this
log message:

[2003/04/30 23:04:09]  Velocity   [info] ResourceManager : found
/WEB-INF/view/Home.vm with loader
org.apache.velocity.tools.view.servlet.WebappLoader


To show you that I'm not on crack, here is relevant stuff from
web.xml (I hope the XML does not get gobbled up by my or your
mailer):

    <servlet-mapping>
        <servlet-name>SimpyStrutsActionServlet</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>

    <servlet-mapping>
        <servlet-name>SimpyVelocityViewServlet</servlet-name>
        <url-pattern>*.vm</url-pattern>
    </servlet-mapping>

The 2 servlet-names _do_ point to correct classes:
  org.apache.struts.action.ActionServlet
and
  org.apache.velocity.tools.view.servlet.VelocityViewServlet

My action mapping in Struts config looks like this:

	<action path=      "/Action"
		type=      "com.simpy.webapp.actions.HomeAction"
		scope=     "request"
		validate=  "false">
	    <forward name= "success"   path="/WEB-INF/view/Home.vm"/>
         </action>

And in my .war file, this Home.vm really is there, in the
correct place:
  WEB-INF/view/Home.vm

So, what I am wondering is:
 1) How come .do requests are still going to Struts Action
servlet?
 2) What does VVServlet need in order to find my Home.vm file?

Thank you,
Otis


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Re: ResourceManager : unable to find resource ...

[Nathan Bubna <na...@esha.com>]

otisg said:
...
> I am trying to use the regular Struts Action servlet along
> VelocityViewServlet.  The former mapped to *.do, the latter to
> *.vm requests.  I am observing some strange behaviour:
>
> 1. Request to http://.../Action.vm give me an error:
>
> VelocityServlet : Error processing the template
> org.apache.velocity.exception.ResourceNotFoundException: Unable
> to find resource '/Home.vm'
...

??  You are asking the servlet for 'Action.vm' and it tries to find
'Home.vm'?  I'm guessing you just typed that wrong...

Anyway, two things:

1.  You aren't using the latest CVS of velocity-tools.  I can tell by the
error message text :-).  Since we haven't had a release yet, updating your
code to the latest should be one of your first debugging steps.  That way I
know you're on the same page as me.

2. In your velocity.properties, what is the path you have set for the
WebappLoader?  It should be a line something like:

webapp.resource.loader.path = blah blah blah

> 2. Request to http://.../Action.do _does_ work _but_ seems to
> use Velocity classes.  That is strange, because I have .do
> mapped to Struts Action servlet, and _not_ VelocityViewServlet.
> Weird, no?

Not weird at all.  Your Struts actions *should* forward to a velocity
template once they are done processing.  The action is the controller and
the template is the *view.*  That's the whole point.  :-)

...
> My action mapping in Struts config looks like this:
>
> <action path=      "/Action"
> type=      "com.simpy.webapp.actions.HomeAction"
> scope=     "request"
> validate=  "false">
>     <forward name= "success"   path="/WEB-INF/view/Home.vm"/>
>          </action>
>
> And in my .war file, this Home.vm really is there, in the
> correct place:
>   WEB-INF/view/Home.vm

Ah ha!  I'm betting you don't have a webapp.resource.loader.path set, and
that the URL you are hitting to access the Home.vm or Action.vm template
directly does not include the full /WEB-INF/view/  path, right?

my recommendation is this:

1. update your velocity-tools code from CVS.

2.  in your velocity.properties, set
webapp.resource.loader.path = /WEB-INF/view

3.  in your struts-config.xml, remove the /WEB-INF/view portion of your
template paths and trim them down to just the template name.  e.g.

<forward name="success" path="Home.vm" />

If that doesn't work, take two aspirin and call me in the morning.

Nathan Bubna
nathan@esha.com


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