A customization class is the interface that the Oracle Metadata Services (MDS) framework uses to define which customization layer should be applied to the application's base definition metadata.
To begin creating a customization class, you will use the New Gallery to open the Create Java Class dialog. To open the New Gallery, in the Application Navigator, right-click the project and choose New . In the New Gallery, select General in the Categories tree and select Java Class in the Items list, then click OK.
In the Create Java Class dialog, you will enter a customization class name in the package
When you click OK, you can begin editing the customization class in the source editor.
Then you will deploy the customization class to a JAR file. To begin, you will use the New Gallery to create a deployment profile. In the New Gallery, select Deployment Profiles under General in the Categories tree and select JAR File in the Items list, then click OK.
To create a deployment profile, you will enter a profile name, specify the location of the deployed archive, and select the files to be included in the archive.
Lastly you will add the customization class to the application configuration file
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