If you plan to do database development with Java and MySQL, the first thing you’ll need to do is configure a database schema. Technically speaking, the first thing to do before you configure a schema ...

Create two new rules (click the Create Firewall Rule button) to allow all source IPs (0.0.0.0/0) to access TCP port 8080, with label port8080, and TCP port 8000, with label port8000.

Here's a quick JDBC with HSQLDB tutorial to get you up and running with Java database connectivity and the popular HyperSQL database.