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# Configuring Customizer Class

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A session customizer class is a Java class that implements the `oracle.toplink.tools.sessionconfiguration.SessionCustomizer` interface and provides a default (zero-argument) constructor. You can use a session customizer to customize a session at run time on a loaded session before login occurs, similar to how you can use an amendment method to customize a descriptor (see "Configuring Amendment Methods"). For example, you can use a session customizer class to define and register session event listeners with the session event manager (see "Configuring Session Event Listeners").

Table: Session Support for Customizer Class Configuration summarizes which sessions support customizer class configuration.

Session Support for Customizer Class Configuration

Session | Using TopLink Workbench | Using Java
--- | --- | ---
Server and Client Sessions |  |
Session Broker and Client Sessions |  |
Database Sessions |  |

For more information, see "Session Customization".