Sun Java System Application Server Support

Application Server support for CMP includes:

• Full support for the J2EE v 1.4 specification’s CMP model.

  • Support for commit options B and C for transactions, as defined in the Enterprise JavaBeans Specification, v2.1. See Commit Options.

  • The primary key class must be a subclass of java.lang.Object. This ensures portability, and is noted because some vendors allow primitive types (such as int) to be used as the primary key class.

• The Application Server CMP implementation, which provides:

  • An Object/Relational (O/R) mapping tool that creates XML deployment descriptors for EJB JAR files that contain beans that use CMP

  • Support for compound (multi-column) primary keys

  • Support for sophisticated custom finder methods

  • Standards-based query language (EJB QL)

  • CMP runtime support. See Configuring the CMP Resource.

• Application Server performance-related features, including:

  • Version column consistency checking

  • Relationship prefetching

  • Read-Only Beans

  For details, see Performance-Related Features.