U

UML

Unified Modeling Language, a standard way to represent aspects of object-oriented applications, sponsored by the Object Management Group.

Unmanaged field

An object's member field that JDO ignores. JDO will not fetch a persistent value for the field. Neither will it commit, roll back, or clear the value when the transaction completes.

Unmanaged object

An object that JDO is not controlling. JDO never manages the objects that are not instances of persistence-capable classes, and it may or may not manage an object that is an instance of a persistence-capable class. In this book, an unmanaged object of a persistence-capable class is called a JDO-transient object.