5 things you didn't know about ... JARs

For most Java developers, JAR files and their specialized cousins, WARs and EARs, are simply the end result of a long Ant or Maven process. It's standard procedure to copy the JAR to the right place on the server (or, more rarely, the user's machine) and forget about it. Actually, JARs can do more than store source code, but you have to know what else is possible, and how to ask for it. The tips