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joshbay84 (4) [Avatar] Offline
I have a FormPanel like
loginFormPanel.setAction( GWT.getModuleBaseURL() + "/usermanagement" );
loginFormPanel.setMethod( FormPanel.METHOD_POST );

The declaration in the gwt.xml is as below:
<servlet path='/usermanagement' class=''/>

UserManagementServlet is a normal HttpServlet not the one provided by GWT as shown below:

public class UserManagementServlet
extends HttpServlet
public void doPost( HttpServletRequest req, HttpServletResponse res )
Enumeration reqParams = req.getParameterNames();

while( reqParams.hasMoreElements())
Object obj = reqParams.nextElement();//This is never executed
System.out.println( "element : " + obj );



The issue that I am facing is that req.getParameterNames() returns null.
I am not sure how to get the request parameters since all I have done is placed one widget after another on a VerticalPanel and then added it to the FormPanel, so in request.getParameter("name"), what would be the name parameter?

Also, is there any way by which we can call a particular method of GWT Servlet from the submit action of FormPanel ?
joshbay84 (4) [Avatar] Offline
Re: FormPanel
Got that to work, problem was that setName method on the widgets were not called and hence no parameters were sent.

But now I have another query, I am not able to call GWT servlet directly using below:
loginFormPanel.setAction( GWT.getModuleBaseURL() + "/usermanagementservlet" );
loginFormPanel.setMethod( FormPanel.METHOD_POST );

because I do not know which method will be called on the servlet. I cannot override doPost because it is final in RemoteServiceServlet.

If there is no way to call this servlet using above methods of FormPanel, then I guess FormPanel is used only to submit request to normal Servlet and not gwt one.

Please let me know if I am doing something wrong?

robert.hanson (173) [Avatar] Offline
Re: FormPanel
You can't target a RemoteServiceServlet with FormPanel, it must be a regular servlet, and you would need to override doPost().
jcmorris-mts (4) [Avatar] Offline
Re: FormPanel
Rob et. al.

So, if I understand this thread correctly, one can :
a) Use widgets on regular panels to make some kind of GUI and tie it to the server via a RemoteServiceServlet or
b) Use a FormPanel and tie it to a plain HttpServlet and override doPost().

When would you choose to do one over the other, assuming that both are creating a GUI for submitting form data?
robert.hanson (173) [Avatar] Offline
Re: FormPanel
Right. As far at when to use which, it is just a matter of taste. If it makes more sense in you application to use a regular servlet, then go for it, especially if it helps simplify the application. There is no right or wrong way.