Even Java systems can be "legacy" systems. This article explores 8 quick and relatively low risk ways to improve even the crustiest Java application. Applications that may have previously been written off as dead can find new life by using these tips to improve performance, reduce operations overhead and grease the gears of the development lifecycle.
Anil Hemrajani relates Agile practices to Java and several open source toolsets (Spring, Hibernate, Eclipse) designed to make Java development simpler. It's a high level overview of some free technologies used in web app development. Matt Morton liked this book, recommending it to technical managers and intermediate developers in small Java web development shops.