Enrich user information results in NullPointerException if "preferred_username" is not existing

[lazyo666]

Overview of the issue

Every call to the Gateway results in a NullPointerException if claim do not contain the "preferred_username".

java.lang.NullPointerException: Cannot invoke "Object.toString()" because the return value of "java.util.Map.get(Object)" is null

Motivation for or Use Case

Successfully call a route of the gateway

Reproduce the error

1. Genrate a gateway project
2. Call [gateway]/api/gateway/routes

Related issues

Suggest a Fix

https://github.com/jhipster/generator-jhipster/blob/main/generators/server/templates/src/main/java/package/config/SecurityConfiguration_reactive.java.ejs#L444

JHipster Version(s)

JHipster 7.9.2

JHipster configuration

{ "generator-jhipster": { "applicationType": "gateway", "authenticationType": "oauth2", "baseName": "gateway", "blueprints": [], "buildTool": "maven", "cacheProvider": "no", "clientFramework": "no", "clientPackageManager": "npm", "clientTheme": "none", "clientThemeVariant": "", "creationTimestamp": 1634563324703, "databaseType": "no", "devDatabaseType": "no", "devServerPort": 9060, "dtoSuffix": "DTO", "enableGradleEnterprise": false, "enableHibernateCache": false, "enableSwaggerCodegen": false, "enableTranslation": false, "entities": [], "entitySuffix": "", "jhiPrefix": "jhi", "jhipsterVersion": "7.9.2", "jwtSecretKey": "YourJWTSecretKeyWasReplacedByThisMeaninglessTextByTheJHipsterInfoCommandForObviousSecurityReasons", "languages": ["en", "fr"], "messageBroker": false, "nativeLanguage": "de", "otherModules": [], "packageName": "com.mycompany.myapp", "pages": [], "prodDatabaseType": "no", "reactive": true, "searchEngine": false, "serverPort": "8080", "serverSideOptions": [], "serviceDiscoveryType": "consul", "skipCheckLengthOfIdentifier": false, "skipClient": true, "skipFakeData": false, "skipServer": false, "skipUserManagement": true, "testFrameworks": [], "websocket": false, "withAdminUi": true } }

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[mraible]

@lazyo666 What identity provider do you experience this with? I haven't seen it with Keycloak, Okta, or Auth0. Nevertheless, it's a worthwhile check. Can you please provide a PR?

[mraible]

I'll close this soon if no identity provider is provided.

[mraible]

Closing due to lack of response.