[SOLVED] Vaadin 6.3.0 problem

Romuald MAIRE

Hi, i have a problem since my upgrade.

I get the following error message, but the only changes i made was to update VAADIN and GWT jars ! I don't touch the source code of my application !

The message : "Communication problemTake note of any unsaved data, and click here to continue."

Debug details :
"Vaadin application servlet version: 6.3.0Widget set is built on version: 6.3.0Application version: NONVERSIONEDWarning: widgetset version 6.3.0 does not seem to match theme version 6_3_0inserting load indicatorMaking UIDL Request with params: initServer visit took 140msCommunication error: UIDL could not be read from server. Check servlets mappings. Error code: 404"

You can see the problem at the following URL : http://proresil.ch/Test/?debug

Thanks for your help !!!

Last updated on Jul, 29th 2010

Artur Signell

James MAIRE: Communication error: UIDL could not be read from server. Check servlets mappings. Error code: 404

The UIDL request cannot be read from the server. Make sure your servlet mappings are correct as the error message suggests. http://proresil.ch/Test/UIDL should not return 404 not found

Romuald MAIRE

Thanks, it's really a problem and i can't find it !

I have many applications in a web server.

The server is like following :

+ www
     |-- Test
        |-- VAADIN
           |-- themes
           |-- widgetsets
        |-- WEB-INF
           |-- classes
           |-- lib
           |-- web.xml
     |-- Test2
        |-- VAADIN
           |-- themes
           |-- widgetsets
        |-- WEB-INF
           |-- classes
           |-- lib
           |-- web.xml

In this example i have 2 Vaadin applications named TEST and TEST2.

My web.xml file for one project TEST :

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app id="ProResilTest" version="1.0">
        <display-name>ProResilTest</display-name>
        <context-param>
                <param-name>productionMode</param-name>
                <param-value>false</param-value>
                <description>ProResil production mode</description>
        </context-param>
        <servlet>
                <servlet-name>ProresilApplication</servlet-name>
                <servlet-class>com.vaadin.terminal.gwt.server.ApplicationServlet</servlet-class>
                <init-param>
                        <param-name>application</param-name>
                        <param-value>com.proresil.views.ProresilApplication</param-value>
                        <description>Proresil application class to start</description>
                </init-param>
                <init-param>
                        <param-name>widgetset</param-name>
                        <param-value>com.vaadin.terminal.gwt.DefaultWidgetSet</param-value>
                        <description>Application widgetset</description>
                </init-param>
        </servlet>
        <servlet-mapping>
                <servlet-name>ProresilApplication</servlet-name>
                <url-pattern>/*</url-pattern>
        </servlet-mapping>
        <servlet-mapping>
                <servlet-name>ProresilApplication</servlet-name>
                <url-pattern>/VAADIN/*</url-pattern>
        </servlet-mapping>
        <welcome-file-list>
                <welcome-file>index.html</welcome-file>
                <welcome-file>index.htm</welcome-file>
                <welcome-file>index.jsp</welcome-file>
                <welcome-file>default.html</welcome-file>
                <welcome-file>default.htm</welcome-file>
                <welcome-file>default.jsp</welcome-file>
        </welcome-file-list>
</web-app>

Thanks by advance for your help !!!

Last updated on Apr, 20th 2010

Ros Linda

YES I have the same problem, my portlet is showing in my localhost:8080/ with the next error

--ERROR pop up

Communication problem

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

UIDL could not be read from server. Check servlets mappings. Error code: 4

---

In my localhost:8080/myproject/ i can see the portlet working correctly. :)

But i need it working good without errors in my app in liferay 6.2 specifically localhost:8080/

I thought that the problem is the context path of the project but my context path was changed from "/myproject" to "/'

This is my servlet 3.0

@WebServlet(value = {"/*"}, asyncSupported = true)
   @VaadinServletConfiguration(productionMode = false, ui = MyprojectUI.class)
   public static class MyprojectUIServlet extends VaadinServlet {
   }
...

What can i do ?

Im using vaadin 7.1.1 tomcat 7.42 liferay 6.2

Aparna Kaza

What is the solution for this issue? I am seeing it too using tomcat 6.39, vaadin 7.2.3

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[SOLVED] Vaadin 6.3.0 problem

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Free ebook & tutorial.