The task of persisting Java technology objects to any relational database is challenging because it involves serializing the hierarchically structured Java objects to a tabular-structured database and vice versa. This challenge is unique because of the need to map Java technology objects to database columns and records in a way that is optimized for both speed and efficiency. The Java Data Objects (JDO) specification, Java Specification Request (JSR) 12, defines an API for a standard way to transparently persist plain Java technology object and database access. Using JDO, Java application developers can write code to access the underlying data store without using any database-specific code. This paper provides a tutorial on JDO.
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