The bulk of the text is devoted to code snippets that display the most common usage scenarios in which the library classes are used.

In particular, we cover the usage of the key The major building blocks of Joda-Time are introduced below.

The concept is part of the Java Beans specification, and is also explained in this chapter.

Spring 3 introduces a "core.convert" package that provides a general type conversion facility, as well as a higher-level "format" package for formatting UI field values.

While you can run validation manually, it is more natural to let other specifications and frameworks validate data at the right time (user input in presentation frameworks, business service execution by CDI, entity insert or update by JPA).

An application can choose to enable Bean Validation once globally, as described in Section 9.8, “Spring Validation”, and use it exclusively for all validation needs.

Consult this page for more details on this problem. For the actual date validity, you should rely on another language.Examples for interval, duration and period may be found in the appropriate section in the "Key Concepts" part of the documentation.The most frequently used concept in Joda-Time is that of the instant.Before Java will attempt to launch a signed application, the associated certificate will be validated to ensure that it has not been revoked by the issuing authority.This feature has been implemented using both Certificate Revocation Lists (CRLs) and Online Certificate Status Protocol (OCSP) mechanisms.