appengine-spring-boot

Sample Google App Engine (standard) application using :

• Java 21 :
• Spring Boot 3.2 milestone 3 : the application is packaged as an executable WAR also deployable on servlet containers
• Jetty12 SpringBoot configuration
• Latest AppEngine artifacts build from head for Java 21
• JSP : just to prove it works, you should probably use another template engine like thymeleaf

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 dull, it just proves Java 8 + Spring Boot + JSPs work.

You can also hit /aliens to see a dumb HTTP API example.

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

• Can't launch the app locally using mvn appengine:devserver because the maven plugin has unresolved issues with the Java 8 runtime (should be fixed by next version)
• The Spring Context is initialized by declaring Spring MVC's DispatcherServlet in web.xml. This should not be necessary because the Spring Boot application class extends SpringBootServletInitializer.
• If you want to add global security constraints using the App Engine user APIs, you still need a web.xml