Static Principal Id
Returns a static, hardcoded value for the username attribute. Values can use the Spring Expression Language syntax.
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{
  "@class" : "org.apereo.cas.services.CasRegisteredService",
  "serviceId" : "sample",
  "name" : "sample",
  "id" : 100,
  "usernameAttributeProvider" : {
    "@class" : "org.apereo.cas.services.StaticRegisteredServiceUsernameProvider",
    "value": "always-static-username"
  }
}
You may be able to carry out the same task with Groovy, though this option here is slightly more efficient performance-wise.