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# TopLink Domain JAR

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The domain JAR contains the TopLink files and domain objects required by the application, including the following:

- sessions.xml File

- project.xml File (or the compiled project.class file if you are not using XML files for deployment)

- The mapped classes required by the application, in a fully-resolved directory structure

When you create the JAR file, the JAR building utility automatically creates a directory structure within the JAR. Ensure that the `sessions.xml` file and the `project.xml` file (or `project.class` file) appear at the root of the JAR file. Also ensure that the class directory structure starts at the root of the JAR.

If you do not store the `project.xml` or `sessions.xml` files at the root of the JAR file, see "Packaging With TopLink Metadata File Resource Paths".