ENTERPRISE JAVABEANS
\ˈɛntəpɹˌa͡ɪz d͡ʒˈɑːvə bˈiːnz], \ˈɛntəpɹˌaɪz dʒˈɑːvə bˈiːnz], \ˈɛ_n_t_ə_p_ɹ_ˌaɪ_z dʒ_ˈɑː_v_ə b_ˈiː_n_z]\
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(EJB) A server-sidecomponent architecture for writing reusable business logicand portable enterprise applications. EJB is the basis ofSun's Java 2 Platform, Enterprise Edition (J2EE).Enterprise JavaBean components are written entirely in Javaand run on any EJB compliant server. They are operatingsystem, platform, and middleware independent, preventingvendor lock-in.EJB servers provide system-level services (the "plumbing")such as transactions, security, threading, andpersistence.The EJB architecture is inherently transactional,distributed, multi-tier, scalable, secure, and wireprotocol neutral - any protocol can be used: IIOP,JRMP, HTTP, DCOM etc. EJB 1.1 requires RMI forcommunication with components. EJB 2.0 is expected to requiresupport for RMI/IIOP.EJB applications can serve assorted clients: browsers, Java,ActiveX, CORBA etc. EJB can be used to wrap legacysystems.EJB 1.1 was released in December 1999. EJB 2.0 is indevelopment.Sun claims broad industry adoption. 30 vendors are shippingserver products implementing EJB. Supporting vendors includeIBM, Fujitsu, Sybase, Borland, Oracle, andSymantec.An alternative is Microsoft's MTS (Microsoft TransactionServer). (http://java.sun.com/products/ejb/).FAQ (http://java.sun.com/products/ejb/faq.html).
By Denis Howe
Word of the day
hydromorphic
- [Greek] Structurally adapted to an aquatic environment, as organs of water plants.