If you need a database that you can embed in Java, have a look at: H2: https://www.h2database.com/html/main.html https://www.h2database.com/html/main.html HSQ

If you need a database that you can embed in Java, have a look at: H2: https://www.h2database.com/html/main.html https://www.h2database.com/html/main.html HSQLDB: https://hsqldb.org/ https://hsqldb.org/ Apache Derby: https://db.apache.org/derby/ https://db.apache.org/derby/ Though those would certainly be a bit niche approaches, so you'll find that there are fewer examples of using either online.