Failed to load application


I am a new user of Vaadin framework and i have pleasure to Work With It.
I’m working on a project where we are using vaadin.
I have a confusion of several error I tried to solve it but I can’t have a solution

Here is my error below . . .

28 avr. 2011 23:53:22 org.apache.catalina.core.StandardWrapperValve invoke
GRAVE: Exception lors de l'allocation pour la servlet Mvcvaadin Application
javax.servlet.ServletException: Failed to load application class: com.example.mvcvaadin.MvcvaadinApplication
	at com.vaadin.terminal.gwt.server.ApplicationServlet.init(
	at org.apache.catalina.core.StandardWrapper.initServlet(
	at org.apache.catalina.core.StandardWrapper.loadServlet(
	at org.apache.catalina.core.StandardWrapper.allocate(
	at org.apache.catalina.core.StandardWrapperValve.invoke(
	at org.apache.catalina.core.StandardContextValve.invoke(
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(
	at org.apache.catalina.core.StandardHostValve.invoke(
	at org.apache.catalina.valves.ErrorReportValve.invoke(
	at org.apache.catalina.valves.AccessLogValve.invoke(
	at org.apache.catalina.core.StandardEngineValve.invoke(
	at org.apache.catalina.connector.CoyoteAdapter.service(
	at org.apache.coyote.http11.Http11Processor.process(
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$ Source)
	at Source)

I’m using apache tomcat version 7 and eclipse IDE

I will be so greatful if some one help me.
Thanks !!

PLEASE someone help me i need a solution it’s very importent please :frowning:

Il n’y a pas assez d’information dans la trace fournie pour y voir quoi que ce soit. Arrêter Tomcat, retirer tous les logs, relancer Tomcat et examiner tous les logs. Tant que tu ne trouveras pas un message autre que “ne fonctionne pas”, on ne pourra guère t’aider. Suggestion: travailler avec Tomcat 6 qui est plus connu que Tomcat 7.