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Java EE 7 Developer Handbook by Peter A. Pilgrim

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Chapter 11. Advanced Topics in Persistence

E. F. Codd, 1970 said, "Future users of large databanks must be protected from having to know how the data is organized in the machine (the internal representation)".In this chapter, we will look at the advanced topics for Java Persistence that builds on the knowledge we cemented in Chapter 4, Essential Java Persistence and Chapter 5 Object-Relational Mapping with JPA.

Persistence of map collections

The ability to manage persistence capable objects with java.util.Map type collections has been around since JPA 2.0, so this is not strictly a Java EE 7 feature. Map collections are extremely useful for Java applications, where data can be accessed in data types that are organized into key-and-value pairs. ...

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