I should have read more carefully, that is trickier. It looks like you
could override getMethod, attempt to execute super.getMethod, trap
the NoSuchMethodException if the method is not found, and return
a Method corresponding to unspecified:
Method method = null;
try {
method = super.getMethod(name);
}
catch (NoSuchMethodException e) {
method = super.getMethod("unspecified");
}
return method;
I know that it is less than ideal to have to catch the Exception to
determine if the method is missing or not, but hopefully that will
not occur very often...
-----Original Message-----
From: Larry Zappeterrini
Sent: Monday, February 03, 2003 3:10 PM
To: 'Struts Users Mailing List'
Subject: RE: how to handle method not found in DispatchAction
You should override the method unspecified. Check out the
DispatchAction Java doc:
http://jakarta.apache.org/struts/api/org/apache/struts/actions/DispatchActio
n.html#unspecified(org.apache.struts.action.ActionMapping,%20org.apache.stru
ts.action.ActionForm,%20javax.servlet.http.HttpServletRequest,%20javax.servl
et.http.HttpServletResponse)
-----Original Message-----
From: Wendy Smoak [mailto:[EMAIL PROTECTED]]
Sent: Monday, February 03, 2003 3:05 PM
To: 'Struts Users Mailing List'
Subject: RE: how to handle method not found in DispatchAction
> suppose I have a following URL
> /pages/MyDispatchAction.do?nextpage=home
> and class MyDispatchAction has a method
> public ActionForward home(...)
> so this request is handled by this method,
> Suppose there is a request to DispatchAction , for
> which there is no method to handle it , it crashes,
> Is there a way to forward all these request to a
> default page, if there is no method to handle the
> request???
> Has anyone written or done some thing like this to
> handle this error neatly
I override execute() and provide a default, but my main problem is the
action being called *without* the parameter, not with one that doesn't have
a mapping.
public final class EditContactAction extends LookupDispatchAction
{
public ActionForward execute( ... )
{
if ( request.getParameter( mapping.getParameter() ) == null ) {
log.debug( "parameter is missing, defaulting to add" );
return addContact( mapping, form, request, response );
} else {
log.debug( "parameter present, calling super.execute" );
return super.execute( mapping, form, request, response );
}
}
}
Sounds like you would need to do something like:
if ( !getKeyMethodMap.containsKey( request.getParameter(
mapping.getParameter() ) ) { ... }
(But my getKeyMethodMap creates a new Map every time, and I wouldn't want to
do that... perhaps the Map should be a class variable instead.)
Personally I would like to see a 'default' attribute for the <action> tag.
That way LookupDispatchAction could itself fall back on a default value if
the specified parameter is missing or not in the Map.
--
Wendy Smoak
Applications Systems Analyst, Sr.
Arizona State University PA Information Resources Management
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