Code Example – User Authentication with Google App Engine Java Applications

The article presents quick code samples that could be used to adopt Google User authentication service. These strategies have been used in the google app, Following key aspects are presented in this article.

  • Web.xml configuration to restrict access to pages
  • Use Google User service


Web.xml configuration to restrict access to pages

With following code in web.xml, one could restrict access to one or more pages in matter of no time. You could try on how below configuration works by accessing the page, and you would be sent to Google login if not yet logged in on the browser.



Use Google User service

With following code in java code, one could get an access to userId which could be used to store in the datastore as a creator of one or more data objects.

UserService userService = UserServiceFactory.getUserService();
User user = userService.getCurrentUser();
String userId = user.getUserId();


Ajitesh Kumar
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Ajitesh Kumar

I have been recently working in the area of Data analytics including Data Science and Machine Learning / Deep Learning. I am also passionate about different technologies including programming languages such as Java/JEE, Javascript, Python, R, Julia, etc, and technologies such as Blockchain, mobile computing, cloud-native technologies, application security, cloud computing platforms, big data, etc. For latest updates and blogs, follow us on Twitter. I would love to connect with you on Linkedin. Check out my latest book titled as First Principles Thinking: Building winning products using first principles thinking. Check out my other blog,
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