Spring WebSocket with STOMP app for App Engine Flexible Environment

Requirements

• Apache Maven 3.3.9 or greater
• Google Cloud SDK
• gcloud components install app-engine-java
• gcloud components update

Setup

Use either:

• gcloud init
• gcloud beta auth application-default login

We support building with Maven, Gradle, and Intelij Idea. The samples have files to support both Maven and Gradle. To use the IDE plugins, see the documentation pages above.

Maven

Using Maven and the App Engine Plugin & Maven Plugin Goals and Parameters

Running locally

    $ mvn jetty:run
-OR-
    $ mvn jetty:run-exploded
-OR-
	$ mvn clean install jetty:run    

Deploying to App Engine Flexible Environment - currently in Beta

    $ mvn appengine:deploy
-OR-
	$ mvn clean install appengine:stage appengine:deploy    

@see https://github.com/GoogleCloudPlatform/nodejs-docs-samples/tree/master/appengine/websockets

Firewall rule

$ gcloud compute firewall-rules create default-allow-websockets \
  --allow tcp:65080 \
  --target-tags websocket \
  --description "Allow websocket traffic on port 65080"

// In order to use websockets on App Engine, you need to connect directly to // application instance using the instance's public external IP. This IP can // be obtained from the metadata server.

METADATA_NETWORK_INTERFACE_URL = 'http://metadata.google.internal/computeMetadata/v1/instance/network-interfaces/0/access-configs/0/external-ip';

http://metadata.google.internal/computeMetadata/v1/instance/network-interfaces/0/access-configs/0/external-ip -OR- http://metadata/computeMetadata/v1/instance/network-interfaces/0/access-configs/0/external-ip

open issue

https://stackoverflow.com/questions/25708617/spring-4-websocket-configure-port

Ref

http://docs.spring.io/spring/docs/current/spring-framework-reference/html/websocket.html