Using external Jars on GWT server-side

Question

Im new to GWT. Im using the eclipse plugin and started tweaking google's 'hello, world!' project: greetServlet.

Im trying to build a webapp that will use XML (de)serializing. I chose XStream library for the relative easiness. my classpath includes the xstream.jar. I also manually copied the jar to the WEB-INF/lib folder (Is this a mistake? is there a way in which eclipse will copy external jars by itself to the deployment folder?).

I added a single line to GreetingServiceImpl.greetServer XStream xs = new XStream(); and this is where it fails.

It throws an exception on RPC call to greetServer. Why? What's the matter?

Is this specific to XStream or am I mising some thing in adding an external jar?

Answer 1

If you are running in the development mode in eclipse, it could be that XStream is not supported by the Google Appengine whitelist.

http://code.google.com/intl/es-AR/appengine/docs/java/jrewhitelist.html

If this is your problem, you can run your application in a Tomcat.