Before it sued Google for copying from Java, Oracle got rich copying IBM’s SQL Oracle's history highlights a possible downside to its stance on API copyrights.

This functionality also helps in migration scenarios from Oracle, where applications rely on Oracle Java procs in the database. With the ability to execute Java inside stored procedures in SQL Server, ...

Oracle’s Java Management Service can shine a light on which versions of Java you’re running, what apps are running on them, and which installs are outdated.

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