Mapstore returning an 500 error with OIDC group mapping with user matching more than one group

[RomainBourgATOL]

Description

When mapstore has a OIDC integration for the users, if the user matches more than one group in the group's mapping Mapstore become unusable (500 error from server after authenticating)

How to reproduce

• Have a mapstore and a keycloak up and running cf https://docs.mapstore.geosolutionsgroup.com/en/v2024.01.02/developer-guide/integrations/users/openId/#keycloak and https://docs.mapstore.geosolutionsgroup.com/en/v2024.01.02/developer-guide/integrations/users/keycloak/#direct-user-integration (using direct integration)
• Create at least two realm roles in keycloak (like groupA and groupB)
• Map the Keycloak roles to mapstore groups
  keycloakOAuth2Config.groupMappings=groupA:groupA,groupB:groupB
• Create a user, and assign him the two roles
• Authenticate with this user through Mapstore

Expected Result
The user is correctly authenticated and mapped to two mapstore groups : groupA and groupB

Current Result
500 error server-side, no interface

Other useful information

• If you remove one group, the user can user Mapstore without error
• The keycloak's user can have multiple roles, but if at least two of them are present in the mapstore's group configuration mapping the problem will occur