Chapter 7. Scheduling and timers

This chapter covers

  • The basics of the EJB Timer Service
  • The basics of cron
  • Different types of timers
  • Declaring cron timers
  • Using ad hoc timers

So far in our study of EJBs, actions performed by beans must be initiated either on startup or as a result of an external action such as a method invocation from the web tier or to handle a message delivered via JMS. A user must click something in a web page or a JMS message must be delivered for an EJB method to be invoked and the application to do something. While most of the behavior in an application is prompted by user actions, there are times when you want the application to do something on its own either at a specific interval or at specific times. For example, ...

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