What steps will reproduce the problem?
1.open https://code.google.com/p/gdata-java-client/
2. click Google Spreadsheets Data API link
3. get 404 error: 
https://code.google.com/apis/spreadsheets/data/3.0/developers_guide_java.html

What is the expected output? What do you see instead?
https://developers.google.com/google-apps/spreadsheets/
404

Please provide any additional information below.