aptana - ruby connection with h2 DB -

can please share steps connect ruby h2 database. using aptana ide.

i tried connection following command

dbh = sequel.connect("jdbc:h2:mem://localhost/test?user=sa&password=sa") 

and retrieved error as

in `require': loaderror: cannot load such file -- java (sequel::adapternotfound) 

i tried connecting other db postgresql , successful in doing using dbi. wanted know similar solution h2 db.