How to deploy a vaadin project on GAE?

Question

I'm trying to deploy an existing vaadin project to GAE . But I'm constantly getting an error: ClassNotFoundException: com.vaadin.server.GAEApplicationServlet

This is what I've done:

• commented out the @WebServlet annotation in my extends UI class

• projec properties, checked: use Google App Engine. Thereby some libraries were added to my WEB-INF/lib folder: gwt-servlet, jsr107, some appendine-* .

• created the appengine-web.xml

• created the web.xml :

    <servlet> <servlet-name>MyProject</servlet-name> <servlet-class>com.vaadin.server.GAEApplicationServlet</servlet-class> <init-param> <param-name>UI</param-name> <param-value>de.mypath.ApplicationUI</param-value> </init-param> </servlet> 

<servlet-mapping> <servlet-name>MyProject</servlet-name> <url-pattern>/*</url-pattern> </servlet-mapping>

I can run my project fine if I use com.vaadin.server.VaadinServlet and run on a local tomcat. But running on a jetty GAE (or also deploying in the cloud) I get the ClassNotFountException mentioned above.

What is wrong here?

Answer 1

It's been a while since I've used GAE, but when I was it seemed like I had to add some jars to WEB-INF/lib myself, despite everything working fine locally. Later I would get warnings about those same jars, but if I removed them I'ld get NoClassDefFoundException again.

Answer 2

将vaadin-server-7.5.10.jar复制到WEB-INF / lib并使用com.vaadin.server.GAEVaadinServlet而不是com.vaadin.server.GAEApplicationServlet已解决了该问题。