Service Data Objects (SDO) is a specification approved by the Java community through the Java Specification Request (JSR) 235. It is also part of the joint effort from IBM and BEA Systems called CommonJ. SDO is an API (Application Programming Interface) that helps simplify and unify data access across different data source types, which is becoming more and more crucial in the IT industry. Monolithic applications are not built as often anymore and information is often stored in various types of sources (database, Web service, Lightweight Directory Access Protocol (LDAP), legacy, and so forth). This complexity requires developers to become skilled in many APIs (Java database connectivity (JDBC), Java APIs for XML-Based Remote Procedure Call (JAX-RPC), or J2EE Connector Architecture (JCA) to name a few).
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