Java Components (Jars) of the Job Scheduler must be created by a central build process. The Jar filenames must include version information.

The Jars used by the Job Scheduler is build by a central build environment (Ant Build system).
The jar filenames contain version information: <component name><java version><date><subversion number>.jar.
All Jars created by a build process get the same date. The date has the format YDDD. For example com.sos.net-1.6-0083-6316.jar.
Before starting the compile process the Java source is updated with the current version of the subversion repository.
The java classpath is stored in a central in a Ant property file and secure a consistent environment also for the developer, because the developer use the same build environment to build the developement version.
The job scheduler package use for its version also the date of the Jars. So there is a information which Java component is used by which Job Scheduler package version.