When “database introspect –schema no-schema-required” after setting up a hsql db you may get “no driver class available”.

Install the “wrapping” addon:

osgi install –url http://spring-roo-repository.springsource.org/release/org/springframework/roo/wrapping/org.springframework.roo.wrapping.hsqldb/1.8.0.10.0001/org.springframework.roo.wrapping.hsqldb-1.8.0.10.0001.jar