41 The Problem: Impedance Mismatch

How can you easily integrate a Java application with database information? This problem is one of the most underestimated problems in enterprise Java applications. The problem is far more complex and labor-intensive than simply reading from and writing to a database, because: The database world contains stored procedures, tables, rows, columns, and foreign keys The object-oriented Java world contains object references, business rules, complex relationships, and inheritance Runtime considerations such as locking, caching, and sequencing must be managed The problem of bridging these fundamentally different technologies is knows as the object-relational impedance mismatch.

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