1. Build the project

2. Create a directory <KEYCLOAK_HOME>/modules/system/layers/base/com/yt/auth/app-keycloak-oidc-group-info-mapper/main

3. Place the generated app-keycloak-oidc-group-info-mapper.jar and src/main/module/module.xml in the above created directory

4. Create a directory <KEYCLOAK_HOME>/modules/system/layers/base/org/apache/commons/commons-lang3/main

5. Place src/main/config/org.apache.commons.commons-lang3.main/* in the above created directory

6. Add following new provider in standalone.xml file

   <providers>
          <provider>module:com.yt.auth.app-keycloak-oidc-group-info-mapper</provider>
   </providers>
   

7. Restart keycloak app

8. Go to clients --> mappers --> create . In the dropdown you will find new mapper type "Group information mapper"