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| <title>2. Lightweight Persistence</title><base href="display"><link rel="stylesheet" type="text/css" href="css/docbook.css"><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><link rel="home" href="manual.html" title="Apache OpenJPA 2.4 User's Guide"><link rel="up" href="jpa_overview_intro.html" title="Chapter 1. Introduction"><link rel="prev" href="jpa_overview_intro.html" title="Chapter 1. Introduction"><link rel="next" href="jpa_overview_why.html" title="Chapter 2. Why JPA?"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">2. |
| Lightweight Persistence |
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| <span class="emphasis"><em>Persistent data</em></span> is information that can outlive the program |
| that creates it. The majority of complex programs use persistent data: GUI |
| applications need to store user preferences across program invocations, web |
| applications track user movements and orders over long periods of time, etc. |
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| <span class="emphasis"><em>Lightweight persistence</em></span> is the storage and retrieval of |
| persistent data with little or no work from you, the developer. For example, |
| Java serialization |
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| is a form of lightweight persistence because it can be used to persist Java |
| objects directly to a file with very little effort. Serialization's capabilities |
| as a lightweight persistence mechanism pale in comparison to those provided by |
| JPA, however. The next chapter compares JPA to serialization and other available |
| persistence mechanisms. |
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