Quartz is architected in modularized way, that's why before running it, several components need to be snapped together. Components need to be configure before Quartz :
StdSchedulerFactory is a class, that is implementation of org.quartz.SchedulerFactory interface and does all of its work of creating a Quartz Scheduler instance based on the content of properties file. Generally, properties are stored in and loaded from a file, but can also be created by your program and handed directly to the factory. Simply invoking getScheduler() on the factory you get the instance of scheduler.
DirectSchedulerFactory is a class, that is singleton implementation of SchedulerFactory interface. It is useful for those user that want to create their Scheduler instance in more programatic way. Generally, it can be used for the following reasons: (1) it requires the user to have a greater understanding of what they're doing (2) it does not allow for declarative configuration - or in other words, you end up hard-coding all of the scheduler's settings.
"org.apache.commons.logging" framework is used by Quartz for its logging needs. Quartz does not produce so much logging information, it produce some information during initialization and then messages about serious problems while jobs are executing.
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Discuss: Configuration, Resource Usage and StdSchedulerFactory
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