Connecting to Cloud SQL - MySQL with Java 11 on Google App Engine Standard

This sample demonstrates how to use Cloud SQL - MySQL on Google App Engine Standard.

Code

The sample code is located in java-docs-samples/cloud-sql/mysql/servlet. This directory has the supplemental files needed to deploy to Google App Engine Standard with Java 11.

Setup your Cloud SQL Database

• Create a 2nd Gen Cloud SQL Instance by following these instructions. Note the connection string, database user, and database password that you create.

• Create a database for your application by following these instructions. Note the database name.

• Create a service account with the 'Cloud SQL Client' permissions by following these instructions. Download a JSON key to use to authenticate your connection.

Setup the App

• See Prerequisites.

• Add the appengine-simple-jetty-main Main class to your classpath:

  cd java-docs-samples/appengine-java11/appengine-simple-jetty-main
  mvn install

• Move into the sample directory:

cd ../../cloud-sql/mysql/servlet/

• In the new Java 11 runtime, you must remove your appengine-web.xml file and create an app.yaml file to configure your application settings. Create an src/main/appengine directory and copy the app.yaml provided:

mkdir src/main/appengine
cp ../../../appengine-java11/cloudsql/app.yaml src/main/appengine/

• Use the information from creating your database to replace the environment variables in your app.yaml:

CLOUD_SQL_CONNECTION_NAME: '<MY-PROJECT>:<INSTANCE-REGION>:<MY-DATABASE>'
DB_NAME: 'my_db'
DB_USER: 'my-db-user'
DB_PASS: 'my-db-pass'

• Java 11 has specific requirements on packaging your app. Replace the pom.xml with the Java 11 pom.xml:

cp ../../../appengine-java11/cloudsql/pom.xml ./

Deploy to Google Cloud

The following command will deploy the application to your Google Cloud project:

mvn clean package appengine:deploy -DskipTests

View your application:

gcloud app browse

or by visiting https://<your-project-id>.appspot.com.