Trick to inspect an inMemory HSQLDB/H2 instance during a Unit Testing Debug inside the Eclipse IDE...

eclipse-unittesting-debug-invm-hsqldb-view.md

1. add a Breakpoint to your TestCase code
2. start your jUnit Test in Debug mode
3. Open the Display View (Window menu > Show view > Display)
4. paste the following snippet into the Display view

org.hsqldb.util.DatabaseManagerSwing.main(new String[] {
  "--url",  "jdbc:hsqldb:mem:testdb", "--noexit"
});

5. Select the snippet code
6. In the top right side of the Display View box click on the Green arrow icon (Execute the selected Text)
7. Enjoy your HSQLDB Manager GUI!

Reference: http://stackoverflow.com/questions/2697341/inspect-in-memory-hsqldb-while-debugging