You can use import and export procedures which are executable from ij or any Java program. You must have derbytools.jar in your classpath to use the import or export procedures from ij.
To invoke an import or export procedure, you must be connected to the database into which data is imported or from which data is exported. Because the procedures will issue a COMMIT or a ROLLBACK statement, you should perform either a COMMIT or ROLLBACK to complete all transactions and release all table-level locks prior to invoking the import or export procedure. Other user applications that access the table with a separate connection do not need to disconnect.