hi i am beginner in vaadin framework , in first step i have done all the configuration with apachi tomcat …after that i run the helloworld vaadin program and got this error
…
Mar 13, 2012 1:44:49 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Allocate exception for servlet Hellovaadin Application
javax.servlet.ServletException: Failed to load application class: com.example.hellovaadin.HellovaadinApplication
at com.vaadin.terminal.gwt.server.ApplicationServlet.init(ApplicationServlet.java:71)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1206)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:827)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:129)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Unknown Source)
…my code is…
package com.example.hellovaadin;
import com.vaadin.Application;
import com.vaadin.ui.*;
public class HellovaadinApplication extends Application {
@Override
public void init() {
Window mainWindow = new Window(“Hellovaadin Application”);
Label label = new Label(“Hello Vaadin user”);
mainWindow.addComponent(label);
setMainWindow(mainWindow);
}
}
…my web.xml file is …
<?xml version="1.0" encoding="UTF-8"?> HelloVaadin Vaadin production mode productionMode false Hellovaadin Application com.vaadin.terminal.gwt.server.ApplicationServlet Vaadin application class to start application com.example.hellovaadin.HellovaadinApplication Hellovaadin Application /* index.html index.htm index.jsp default.html default.htm default.jsp