How to deploy SpringBoot REST app for Google App Engine?

Question

I tried

Subscription for GoogleAppEngine.

1. INSTALLED GOOGLE APP ENGINE SDK 2. Downloaded the sample Java started code and deployed it. Working fine. 3. Used $appcfg.sh -A <appname> update target/appengine-try-java-1.0 to deploy 4. In this case, its a folder with all the webapp related stuffs 

Question

In my case, I have a spring boot application that creates a jar file. It works with the built-in container, and I believe that Google may have an alternative to deploy using Docker or some other way. But how?

There is no pointer or any details on how to run this on a platform managed by Google, as far as I was looking.

Any help or documentation link !! Deputies ??

Answer 1

Now you can use the Java Flexible Environment App Engine Java Flexible Environment - Java 8 Runtime :

https://cloud.google.com/appengine/docs/flexible/java/dev-java-only

It is based on docker.

UPDATE:

Now you can use Java 8 in the Standard App Engine environment :

• Tutorial: https://codelabs.developers.google.com/codelabs/cloud-app-engine-springboot/index.html

• Example: https://github.com/GoogleCloudPlatform/getting-started-java/tree/master/appengine-standard-java8/springboot-appengine-standard

• Blog post: https://cloudplatform.googleblog.com/2017/09/Java-8-on-App-Engine-Standard-environment-is-now-generally-available.html

Answer 2

The Google App Engine still uses Servlet 2.5, which is lower than Spring Boot requirements (i.e. Servlet 3.0).

There is a workaround to check the documentation for more details.

Answer 3

Spring Download requires Servlet 3.0, which GAE does not have. WorkAround must have a spring-boot-legacy dependency. You can additionally check how to implement: https://github.com/scratches/spring-boot-sample-gae