Setup a driver using Googles Socket Factory
Driver Manager → New
Name: Google Cloud SQL – MySQL
Type: MySQL
Class Name: com.mysql.cj.jdbc.Driver
URL Template: jdbc:mysql:///[{database}]?cloudSqlInstance={host}
Default Port: 0
Libraries → Add Artifact
GroupId: mysql
ArtifactId: mysql-connector-java
Version: RELEASE
→ Add Artifact
Group Id: com.google.cloud.sql
Artifact Id: mysql-socket-factory-connector-j-8
Version:RELEASE
Driver Properties → right click → add new
socketFactory: com.google.cloud.sql.mysql.SocketFactory
cloudSqlInstance: {host}
Create a connection
set the username and password as usualEdit the cloudSqlInstance property
Done!