chia7712 commented on code in PR #16990:
URL: https://github.com/apache/kafka/pull/16990#discussion_r1733198119


##########
clients/src/main/java/org/apache/kafka/common/security/oauthbearer/internals/secured/AccessTokenRetrieverFactory.java:
##########
@@ -70,6 +73,8 @@ public static AccessTokenRetriever create(Map<String, ?> 
configs,
             if (jou.shouldCreateSSLSocketFactory(tokenEndpointUrl))
                 sslSocketFactory = jou.createSSLSocketFactory();
 
+            boolean urlencodeHeader = validateUrlencodeHeader(cu);

Review Comment:
   nit: `validateUrlEncodeHeader`



##########
clients/src/main/java/org/apache/kafka/common/security/oauthbearer/internals/secured/ConfigurationUtils.java:
##########
@@ -209,6 +209,15 @@ public String validateString(String name, boolean 
isRequired) throws ValidateExc
         return value;
     }
 
+    public Boolean validateBoolean(String name, boolean isRequired) {
+        Boolean value = get(name);
+
+        if (value == null && isRequired)
+            throw new ConfigException(name, null, String.format("The OAuth 
configuration option %s must be non-null", name));

Review Comment:
   you have created the detailed error message, so we don't need to pass `name` 
and `null` to ConfigException



##########
clients/src/main/java/org/apache/kafka/common/security/oauthbearer/internals/secured/AccessTokenRetrieverFactory.java:
##########
@@ -79,8 +84,27 @@ public static AccessTokenRetriever create(Map<String, ?> 
configs,
                 cu.validateLong(SASL_LOGIN_RETRY_BACKOFF_MAX_MS),
                 cu.validateInteger(SASL_LOGIN_CONNECT_TIMEOUT_MS, false),
                 cu.validateInteger(SASL_LOGIN_READ_TIMEOUT_MS, false),
-                cu.get(SASL_OAUTHBEARER_HEADER_URLENCODE));
+                urlencodeHeader);

Review Comment:
   nit: `urlEncodeHeader`



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