Hello I hope you can help. When I want to create my user I do follows Keycloak keycloak = Keycloak.getInstance (getURL (), "MyRealm", "myUser", "myPassword" clientID); UserRepresentation userRep = new UserRepresentation (); userRep.setUsername ("testUser"); CredentialRepresentation CredentialRepresentation credentials = new (); credentials.setType ("password"); credentials.setValue ("t"); List <CredentialRepresentation> list = new ArrayList (); list.add (credentials); userRep.setCredentials (list); userRep.setEnabled (true); userRep.setEmail (&quot;myMail(a)outlook.com&quot;); userRep.setEmailVerified (false); userRep.setFirstName ("Javier"); userRep.setLastName ("Javi"); Map map = new HashMap (); userRep.setAttributes (map); UsersResource users = keycloak.realm ("MyRealm") users ().; Response response = users.create (userRep); first responds with code 200 - 18:14:09 DEBUG org.apache.http.headers:273 - 18:14:09 DEBUG org.apache.http.impl.conn.DefaultClientConnection:254 Receiving response: HTTP/1.1 200 OK but at the end responds with a 500 error and I don't know why :(: - 18:14:10 DEBUG org.apache.http.wire:63 - 18:14:10 DEBUG org.apache.http.wire:63 - 18:14:10 DEBUG org.apache.http.wire:63 - 18:14:10 DEBUG org.apache.http.headers:273 - 18:14:10 DEBUG org.apache.http.headers:276 - 18:14:10 DEBUG org.apache.http.headers:276 eyJhbGciOiJSUzI1NiJ9.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.hAfHcOZZJwYBBoTRhlqzPfraesg7n9Gp0IHFQvmLYK-wYQBcFb7XAkAdGNWujW4kh5e7EJmyIggLWn0KnaPq2Qf2f57x34A3wjSklxdlIskUjLRZMVjUmUz65ayCPaFh33rxQIv6mhtST6CPdowZdsRyGfmcE9kKhknU8jjY2tY - 18:14:10 DEBUG org.apache.http.headers:276 - 18:14:10 DEBUG org.apache.http.headers:276 - 18:14:10 DEBUG org.apache.http.headers:276 - 18:14:10 DEBUG org.apache.http.headers:276 - 18:14:10 DEBUG org.apache.http.wire:77 "{"self":null,"id":null,"username":"testttt","enabled":true,"totp":false,"emailVerified":false,"firstName":"Javier","lastName":"Coria","email":" jcoria(a)healthcentrix.com ","federationLink":null,"attributes":{},"credentials":[{"type":"password","device":null,"value":"t","hashedSaltedValue":null,"salt":null,"hashIterations":null,"temporary":false}],"requiredActions":null,"federatedIdentities":null,"realmRoles":null,"clientRoles":null,"clientConsents":null,"applicationRoles":null,"socialLinks":null}" - 18:14:10 DEBUG org.apache.http.wire:63 << "HTTP/1.1 500 Internal Server Error[\r][\n]" Thank you!!