appengine-spring-boot

Sample Google App Engine (standard) application using :

• AppEngine Java 25, WAR based deployment to use GAE APIs.
• Spring Boot 4.0.1 : the application is packaged as an executable WAR also deployable on servlet containers
• Jetty12.1 EE11 SpringBoot configuration instead of default Tomcat. This way it reuses the Jetty 12.1 provided in AppEngine.
• Latest AppEngine artifacts for Java 25 runtime
• JSP : just to prove it works, you should probably use another template engine like thymeleaf

How to test locally

mvn clean package appengine:run

This command above will start the local devappserver and you can see the home page: http://localhost:8080/ that will display these links to test:

Sample Spring Boot Application running as an App Engine Java25 Web App.!
This is the index.jsp. Try also the following urls:
/aliens
/admin
/actuator/metrics
/actuator/metrics/jvm.memory.max
/actuator/health
/actuator/env
/actuator/threaddump
/actuator/loggers
/actuator/beans
/actuator/health

How to deploy

To deploy on App Engine, run mvn appengine:update -Dappengine.app.id=your_appengine_application_id.
You can also add -Dappengine.app.version=X to override the default version (1).

If you only have one environment, you can set these properties directly in pom.xml or appengine-web.xml.

What's in there

The home page is simple, it just proves Java 25 GAE + Spring Boot 4.0 + GAE APIs (datastore) + JSPs work

You can also hit /aliens to see a HTTP example using AppEngine Datastore APIs.

You can also curl the hell out of the actuator endpoints :

• Health :

curl -i "https://your_appengine_application_id.appspot.com/health

• Sensitive endpoints (credentials in application.yml) :

curl -i "https://your_appengine_application_id.appspot.com/env --user "administrator:M4rSuP1aL-EsTh3T1qUE"

Notes / known issues

• If you want to add global security constraints using the App Engine user APIs, you still need a web.xml