One of my favorite open source tools for Java/J2EE applications is the Cron Job scheduling tool Quartz. Anyone whose ever administered Linux or a web server is probably familiar with creating and modifying cron jobs. What I like about Quartz is that its simple to use, works in both Java and J2EE server-based applications, and is easy to install.

This book should be on the shelf of all Oracle Database professionals. It covers all of the Oracle 10g/11g utilities. A must have in my opinion.