Hello,
In this case it looks like you use a wrong method 'user.getValidationService'.
The service initialization should look like:
CampaignAdExtensionServiceInterface campaignAdExtensionService =
user.getService(AdWordsService.V201101.
CAMPAIGN_AD_EXTENSION_SERVICE);
I suggest to check out our client library examples for quick start:
http://code.google.com/p/google-api-adwords-java/source/browse/trunk/examples/v201101/GetAllCampaigns.java
Best regards,
Danial, AdWords API Team.
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