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What is meant by persistence?

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Question: What is meant by persistence in Java?

Answer: Persistence indicates that a collection of data remains intact even if its source is no longer attached to the network or even more - Java program is not running.

The objects, in JavaSpaces for example, remain available to other users even if the source has temporarily disconnected from the network. This feature is critical to keep distributed systems highly available.

In Java by persistence is meant that an object’s lifetime is not determined by whether a program is executing. In between invocations of the program the object lives.

The simple example of persistance: serialize object and write it to disk, then restore the object when the program is reinvoked. If you need a more serious persistence mechanism, consider Java Data Objects (JDO) or a tool like Hibernate (http://hibernate.sourceforge.net). This example is taken from "Thinking in Java" book.


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