如何使用JavaAPI将keycloak用户的相关role进行更新（领域权限及clients权限）？

        CredentialRepresentation credential = new CredentialRepresentation();
        credential.setType(CredentialRepresentation.PASSWORD);
        credential.setValue("12345678");
        credential.setTemporary(false);
        UserRepresentation user = new UserRepresentation();
        user.setUsername("javaUser1");
        user.setFirstName("java");
        user.setLastName("User");
        user.setEnabled(true);
        user.setCredentials(Arrays.asList(credential));
        user.setRealmRoles(Arrays.asList("ROLE_ADMIN,ROLE_CUSTOMER".split(",")));
        kc.realm("demo").users().get("c97fa338-4064-49aa-a09e-113b6a9368a2").update(user);