throws Exception {
this.parameters = parameters;
// Attempt to connect to the Migrate service.
try {
migratorEndpoint = new URL(this.parameters.get(PARAM_SERVICE));
migrator = new MigrateWrapper( migratorEndpoint );
} catch( MalformedURLException e ) {
throw new Exception("You did not specify a valid migration service URL!");
}
// Also set the pre services: