chibenwa commented on code in PR #2744:
URL: https://github.com/apache/james-project/pull/2744#discussion_r2166874094


##########
server/protocols/jwt/src/main/java/org/apache/james/jwt/JwtTokenVerifier.java:
##########
@@ -67,12 +99,19 @@ public static JwtTokenVerifier create(JwtConfiguration 
jwtConfiguration) {
 
     private static final Logger LOGGER = 
LoggerFactory.getLogger(JwtTokenVerifier.class);
 
+    private final JwtParser kidJwtParser;
     private final List<JwtParser> jwtParsers;
 
     public JwtTokenVerifier(PublicKeyProvider pubKeyProvider) {
+        // one parser that performs key lookup by kid
+        this.kidJwtParser = toImmutableJwtParser(h -> {
+            String kid = Objects.requireNonNull((String)h.get("kid"));
+            return pubKeyProvider.get(kid).orElse(null);

Review Comment:
   Do not use null



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