Hi, I'm trying to make a test run on a Web GUI Framework that is based on GWT (please read for more info at www.vaadin.com). Sorry I can't give a good explanation about vaadin, I'm a complete newbie to this framework. What I know is that every code I make runs on the server using GWT. The code is compiled may be in a servlet, portlet or etc. So it can be deployed in any java container.
I chose GAE as the container, and vaadin has an eclipse plugin for creating vaadin projects so I use eclipse. When creating a vaadin project, one can specify where should the final servlet be deployed - I chose GAE. The instructions in vaadin for running the servlet is to run the development server which I chose Tomcat v6. When I start running the servlet (or app in general), the ff. error always happen. HTTP Status 500 - -------------------------------------------------------------------------------- type Exception report message description The server encountered an internal error () that prevented it from fulfilling this request. exception java.lang.NullPointerException com.google.appengine.api.NamespaceManager.get(NamespaceManager.java: 97) com.google.appengine.api.memcache.MemcacheServiceImpl.setNamespace(MemcacheServiceImpl.java: 186) com.google.appengine.api.memcache.MemcacheServiceImpl.<init>(MemcacheServiceImpl.java: 148) com.google.appengine.api.memcache.MemcacheServiceFactory.getMemcacheService(MemcacheServiceFactory.java: 25) com.vaadin.terminal.gwt.server.GAEApplicationServlet.service(GAEApplicationServlet.java: 210) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) note The full stack trace of the root cause is available in the Apache Tomcat/6.0.26 logs. What could be the cause of the error? -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
