Fix sonar findings (#3135)

Signed-off-by: Avgustin Marinov <Avgustin.Marinov@bosch.com>

hawkbit-ui/src/main/java/org/eclipse/hawkbit/ui/security/UserDetailsSetter.java

@@ -12,6 +12,7 @@ package org.eclipse.hawkbit.ui.security;
 import java.io.IOException;
 import java.time.Instant;
 import java.util.Collection;
+import java.util.Objects;
 
 import jakarta.servlet.FilterChain;
 import jakarta.servlet.ServletException;
@@ -50,7 +51,9 @@ class UserDetailsSetter extends OncePerRequestFilter {
             final Collection<? extends GrantedAuthority> grantedAuthorities = grantedAuthoritiesService.getGrantedAuthorities(authentication);
             if (authentication instanceof OAuth2AuthenticationToken oAuth2AuthenticationToken) {
                 newAuthentication = new OAuth2AuthenticationToken(
-                        oAuth2AuthenticationToken.getPrincipal(), grantedAuthorities,
+                        // principal is not null, but the method is not @NonNull annotated
+                        Objects.requireNonNull(oAuth2AuthenticationToken.getPrincipal()),
+                        grantedAuthorities,
                         oAuth2AuthenticationToken.getAuthorizedClientRegistrationId());
                 if (authentication.getPrincipal() instanceof OidcUser user) {
                     // if there is no refresh token and the access token is expired then re-login is required