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# Configure a custom user name mapper

Before you begin

Review the conceptual information and attribute options for a user name mapper. See Configuring a Custom User Name Mapper

To use a custom user name mapper with the WebLogic Identity Assertion provider (Default Identity Asserter):

1. If you have not already done so, in the Change Center of the Administration Console, click Lock & Edit (see Use the Change Center).
2. On the Security Realms page, select the name of the realm you are configuring (for example, TestRealm).
3. Expand Providers > Authentication and select the name of the Default Identity Asserter.
4. Expand Configuration > Provider Specific.
5. In the User Name Mapper Class Name field, enter the name of the implementation of the `weblogic.security.providers.authentication.UserNameMapper` interface.
6. Click Save.
7. In the Change Center, click Activate Changes.
8. To activate these changes, in the Change Center of the Administration Console, click Activate Changes.
   Not all changes take effect immediately—some require a restart (see Use the Change Center).