steveloughran commented on code in PR #8232:
URL: https://github.com/apache/hadoop/pull/8232#discussion_r2774800484
##########
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/auth/SignerFactory.java:
##########
@@ -124,7 +128,10 @@ public static Signer createSigner(String signerType,
String configKey) throws IO
Signer signer =
S3AUtils.getInstanceFromReflection(className, null, null,
Signer.class, "create",
configKey);
-
+ requireNonNull(conf);
+ if (signer instanceof Configurable sc) {
Review Comment:
fancy java17 feature here
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