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# Deploying the Application

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Application packaging (for deployment in the host Java or J2EE environment) influences TopLink use and configuration. For example, you package a J2EE application in an EAR file. Within the EAR file, there are several ways to package persistent entities within WAR and JAR. How you configure TopLink depends, in part, on how you package the application and how you use the class loader of the host application server.

This section discusses packaging and deployment from a TopLink perspective. However, if you deploy your application to a J2EE container, you must configure elements of your application to enable TopLink container support.

This section includes the following information:

- Understanding Deployments

- TopLink in a J2EE Application

For more information, see Deploying a TopLink Application.