A simple Java-based Extraction, Transformation, and Loading (ETL) tool. It may connect to any JDBC data sources and perform transformations defined in an XML file. [Open source, LGPL]
A tool to monitor and analyse database performance for any Java application. Determines Java applications' database performance and analyses problems down to specific SQL statement.
A library for making JDBC easier to use and less error prone while encouraging a clean separation between persistence and domain logic. [Open source, MIT License]
Java Database Connectivity (JDBC) API is a standard SQL database access interface. This API provides programmers with universal access to a wide range of relational databases. (Sun)