Preface
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## Preface

This document describes how to use the Direct Persistence Layer (DPL) to store and retrieve Java object data. The DPL is introduced in this document in a tutorial-style fashion. This document describes the DPL concepts and the scenarios under which you would use it.

This book is aimed at the software engineer responsible for writing an application in which the ability to persist object data is a desired feature.

## Conventions Used in this Book

The following typographical conventions are used within in this manual:

Class names are represented in `monospaced font`, as are `method names`. For example: "The `Environment()` constructor returns an `Environment` class object."

Variable or non-literal text is presented in italics. For example: "Go to your JE_HOME directory."

Program examples are displayed in a `monospaced font` on a shaded background. For example:

In some situations, programming examples are updated from one chapter to the next. When this occurs, the new code is presented in `monospaced bold` font. For example:

### Note

Finally, notes of special interest are represented using a note block such as this.

### For More Information

Beyond this manual, you may also find the following sources of information useful when building a transactional JE application:

- Berkeley DB Java Edition Getting Started with Transaction Processing

- Getting Started with Berkeley DB Java Edition

- Berkeley DB Java Edition Javadoc

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