Start Vaadin application from servlet

General
1

Hi,

I created an application which started as a conventional servlet. From within the start servlet I would like to forward to the Vaadin part of the application, because I would like to keep the
request
 object.

Unfortunately I did not find a good solution for this. Finally I get an error message:

Failed to load the widgetset: …

In detail I have tried these steps:

[b]

  1. Create a new Vaadin project named “VaadinTest”
    [/b]


2. Create a servlet “Dispatcher”

package com.example.vaadintest;
...
public class Dispatcher extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
...
   protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException,
         IOException {
      RequestDispatcher dispatcher = request.getRequestDispatcher("/Vaadin.do");
      dispatcher.forward(request, response);
...


3. Extend web.xml - note the changes in url-pattern

	<servlet>
		<servlet-name>Dispatcher</servlet-name>
		<display-name>Dispatcher</display-name>
		<description>Dispatcher</description>
		<servlet-class>com.example.vaadintest.Dispatcher</servlet-class>
	</servlet>

	<servlet>
		<servlet-name>Vaadintest Application</servlet-name>
		<servlet-class>com.vaadin.terminal.gwt.server.ApplicationServlet</servlet-class>
		<init-param>
			<description>Vaadin application class to start</description>
			<param-name>application</param-name>
			<param-value>com.example.vaadintest.VaadintestApplication</param-value>
		</init-param>
		<init-param>
			<description>Application widgetset</description>
			<param-name>widgetset</param-name>
			<param-value>com.example.vaadintest.widgetset.VaadintestWidgetset</param-value>
		</init-param>
	</servlet>
	
	<servlet-mapping>
		<servlet-name>Vaadintest Application</servlet-name>
		<url-pattern>/Vaadin.do</url-pattern>
	</servlet-mapping>

	<servlet-mapping>
		<servlet-name>Dispatcher</servlet-name>
		<url-pattern>/Dispatcher.do</url-pattern>
	</servlet-mapping>


4. Start application with
http://myhost/Dispatcher.do


After a few seconds an error box appears on the screen:

Failed to load the widgetset: …

Does anyone know the right way?

Thanks, Thorsten

••••••••••
Eclipse 3.5.1 • Vaadin 6.2.6 • Vaadin Eclipse Integration 1.2.0 • Java 1.5
Windows XP/2000 • IE6/7 • Tomcat 6.0

2

Try adding a /VAADIN/* mapping to application servlet.

3

So I tried this:

<servlet-mapping>
  <servlet-name>Vaadintest Application</servlet-name>
  <url-pattern>/VAADIN/*</url-pattern>
  <url-pattern>/Vaadin.do</url-pattern>
</servlet-mapping>

There’s a little enhancement: the small Vaadin loading animation now appears on the screen. But then the same error message again. Did I misunderstood your suggestion?

Thorsten

4

No - I misread your web.xml. You are using your own widgetset? That widgetset must also be available under /VAADIN - now it seems that it is not.

5

Do you mean this part of the
web.xml
?

		<init-param>
			<description>Application widgetset</description>
			<param-name>widgetset</param-name>
			<param-value>com.example.vaadintest.widgetset.VaadintestWidgetset</param-value>
		</init-param>

Actually I’m not using my own widgetset, but this
web.xml
 entry was inserted automatically somehow. Anyway, I deleted these lines of code.

Now there is a new effect :frowning:
When I start the application an error notification appears:

Commuinication problem Take note of any unsaved data, and click here to continue.

When I click
there
, the message reappears…

6

Try changing /Vaadin.do to /Vaadin.do/*

7

Great! It works fine now with these entries in
web.xml
:

  ...
  <servlet-mapping>
  	<servlet-name>Vaadintest Application</servlet-name>
  	<url-pattern>/Vaadin.do/*</url-pattern>
  </servlet-mapping>
  
  <servlet-mapping>
  	<servlet-name>Vaadintest Application</servlet-name>
  	<url-pattern>/VAADIN/*</url-pattern>
  </servlet-mapping>
  ...

Thanks a lot for your help!
Thorsten