Google Docs and AppEngine: NoClassDefFoundError... why?

[Patrick Moore]

Hi there --

I am running into one of those problems that makes you feel very stupid.

I have an java application that works just fine when running using the Google WebApp plugin on Eclipse 3.5. I have the 1.2.5 version.

Great! ready to upload! Except that I get NoClassDefErrors when I try to run the application on AppEngine

Uncaught exception from servlet
java.lang.NoClassDefFoundError: Could not initialize class com.google.gdata.client.http.GoogleGDataRequest


	at com.google.gdata.client.http.GoogleGDataRequest$Factory.createRequest(GoogleGDataRequest.java:73)
	at com.google.gdata.client.http.HttpGDataRequest$Factory.getRequest(HttpGDataRequest.java:162)
	at com.google.gdata.client.Service.createRequest(Service.java:697)


	at com.google.gdata.client.GoogleService.createRequest(GoogleService.java:525)
	at com.google.gdata.client.Service.createFeedRequest(Service.java:1074)
	at com.google.gdata.client.Service.getFeed(Service.java:915)


	at com.google.gdata.client.GoogleService.getFeed(GoogleService.java:631)
	at com.google.gdata.client.Service.getFeed(Service.java:935)

I suspect that there might be a underling issue and the real not a missing class ... but there is no information other than this....

Any thoughts ?

(attached is the war/WEB-INF/lib listing )

-Pat

[Mario Renato Uriarte Amaya]

Hi patmoore,

I have the same problem

https://groups.google.com/forum/?fromgroups#!topic/google-contacts-api/mvh9xOk13KQ 

Did you find any solution ?

Thks

[alex]

If this helps: in case you're using OAuth 2.0 for authentication, you'll need Google HTTP Client [1] and Google OAuth Client [2] in addition to GData Client library.

I just wrote a little overview on the related stuff here yesterday: 

http://alex.cloudware.it/2012/05/google-apis-authentication-and-app.html

More specifically, you'd need 

- google-http-client-*.jar

- google-http-client-appengine-*.jar

- google-oauth-client-*.jar

- google-oauth-client-appengine-*.jar

Bear with me If you're not doing OAuth 2.0.

[1] http://code.google.com/p/google-http-java-client/

[2] http://code.google.com/p/google-oauth-java-client/