Just a short note to myself on how to connect to hsqldb:

The problem

In one JavaFX application I use hsqldb as database. Now I wanted to connect to that database from outside the application, simply to try out some queries prior to implementing the fullstack feature.

The resolution

Download hsqldb.jar

Download using the maven dependency plugin

mvn dependency:copy-dependencies

Start the Swing client

java -cp hsqldb.jar org.hsqld.util.DatabaseManagerSwing

…then use the following settings:
URL: jdbc:hsqldb:file:fxlink
User and Password: as configured

…and then you are done!