How to modify username in WSO2 IS 7.X.X in the event handler PRE_ADD_USER? - Stack Overflow

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I'm extending the AbstractEventHandler because most of my users' claims values are filled from the data retrieved from a RestAPI response, which is already implemented, i've already done almost everything i needed to in my handler, even my claims are already being succesfully setted.

In the handler based on the given and last names of the user, the username is going to be randomly generated on each request, my idea is:

1. Sending to the self-register endpoint a random string, handled by the Service Provider
2. Based on the ID provided (which i need for retreive data from the API) calling the API, and processing the response
3. Saving the data retrieved and mapping each value to a claim
4. Taking the givenName and lastName values, the generating the random username

Also the username value in the request is being modified when i call:

String newUsername = citizen.getRandomUsername();

while (userStoreManager.isExistingUser(newUsername)) {
   newUsername = citizen.getRandomUsername();
}
eventProperties.put(IdentityEventConstants.EventProperty.USER_NAME, newUsername);

This is the original event context properties:

 .... {PROFILE_NAME=null, user-name=ajpdoajASDPJASD12312ASDPJ, USER_CLAIMS=.... }

This is the context props after modifying it with my handler:

.... {PROFILE_NAME=null, user-name=kgarcia65083, USER_CLAIMS=.... }

However in the DB it is saved with the originally generated username, not the one i after established, how can i set that username before being saved to the DB, i have tried:

1. Setting the PriorityCode to 0, and to 999, but nothing
2. Using the userStore in the POST_ADD_USER, but the username is inmutable in DB

I don't know what else to try, any feedback will be really apretiated :).

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