The following resources contain additional information on log4j. Please use them to get more in-depth knowledge on this topic.
log4j - Official website of log4j, Apache Logging Services Project - Apache log4j.
log4j @ Wikipedia - A short tutorial available at wikipedia.
Sun's Site on JDBC - Sun Developer Network giving link on JDBC material.
MySQL Connector/J - MySQL Connector/J is the official JDBC driver for MySQL.
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