First of all, I am very amazed to know there are such people ( vaadin devs) who are making our lives easier, especially to the Java Desktop Devs like me. Or a complete J2EE newbie. Vaadin is the best web developer solution I’ve known so far.
Now to my problem. I had followed the tuts on setting up my project and deploying my Vaadin+GAE app and so far made it successfully. But when I’ve tried running it on my dev setup, I always get the ff. error.
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
This may be a serialization issue. But I’m just guessing, the reason is that I saw a lot of issues while googling related to serialization of objects in GAE.
If there’s somebody who have tried using Vaadin + GAE, please tell me how you set it up with Eclipse and Vaadin plugin. You might have encountered some specific config that is not mentioned in the Vaadin + GAE Development setup tutorial that could help me. Thank you.
Do I understand you correctly that you try to run a GAE application on a local Tomcat? If this is the case it won’t work as GAE / GAEApplicationServlet uses services only available in GAE, for instance memcache. Sure, you might get it to work if you install all services manually in your Tomcat but the preferred way is to use the local development server included in Google’s App Engine Eclipse plugin. This uses an environment similar to GAE and works out of the box with Vaadin.