do you have mysql jar on the classpath ?
what is the full error message/stack trace ?
Thanks max.andersen. I give the jar file when creating the connection to the database (there ping is successful). After your message, I added the jar to the build path, but I still have the same problem. I get the error message: <Couldn't connect to the database> in the list "Database schema" where it is supposed to show the tables in the database. I don't get any errors or exceptions on the console.