Google AppEngine Server wont start on netbeans 7.4

Question

I just downloaded the Google AppEngine java sdk and netbeans plugins. Installation was smooth until i tried to run the example app. The server wont start. I get the notification on bottom right : 'guestbook run' or 'Starting Server Google AppEngine' but nothing happens after that it just keeps on loading forever. No exceptions or anything. I'm using Netbeans 7.4. What am i doing wrong?

Answer 1

First of all consider posting server logs.In your case I believe you are trying to start it for first time.In your guest book project: simply put:

<threadsafe>true</threadsafe>

in your war/WEB-INF/appengine-web.xml

Like this:

    <?xml version="1.0" encoding="UTF-8"?>
<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
<application></application>
<version>1</version>
<threadsafe>true</threadsafe>

After running your app browse to localhost:8080(or any other port in your case).You should see a guestbook page asking to sign in. See answers Here.