If you have an older version jboss that allows tcp/ip connections to hsqldb
you can goto http://localhost:8080/jmx-console find the hypersonic mbean
the click startDatabaseManager.
Otherwise you have to re-instate remote access for hsqldb.
NOTE: it is bad to put hsqldb on an open port with the default user/password
for the system admin.
Alternatively, write some simple code that connects java:/DefaultDS
and does "drop table whatever"