Fix ClassCastException in extractAndWrapCause when handling Execution… (#1483)

* Fix ClassCastException in extractAndWrapCause when handling ExecutionException

Signed-off-by: Yechan Lim <[email protected]>

* Use UndeclaredThrowableException instead of RuntimeException

Signed-off-by: Yechan Lim <[email protected]>

---------

Signed-off-by: Yechan Lim <[email protected]>
(cherry picked from commit a116304)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

CHANGELOG.md

@@ -13,7 +13,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 ### Removed
 
 ### Fixed
-
+- Fixed ClassCastException in extractAndWrapCause when handling ExecutionException ([#1483](https://github.com/opensearch-project/opensearch-java/pull/1483))
 ### Security
 
 ## [2.22.0] - 03/05/2025

java-client/src/main/java/org/opensearch/client/transport/aws/AwsSdk2Transport.java

@@ -14,6 +14,7 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.UnsupportedEncodingException;
+import java.lang.reflect.UndeclaredThrowableException;
 import java.net.ConnectException;
 import java.net.SocketTimeoutException;
 import java.net.URI;
@@ -694,7 +695,11 @@ private static Exception extractAndWrapCause(Exception exception) {
             if (t instanceof Error) {
                 throw (Error) t;
             }
-            exception = (Exception) t;
+            if (t instanceof Exception) {
+                exception = (Exception) t;
+            } else {
+                exception = new UndeclaredThrowableException(t);
+            }
         }
         if (exception instanceof SocketTimeoutException) {
             SocketTimeoutException e = new SocketTimeoutException(exception.getMessage());

java-client/src/main/java/org/opensearch/client/transport/httpclient5/ApacheHttpClient5Transport.java

@@ -15,6 +15,7 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.lang.reflect.UndeclaredThrowableException;
 import java.net.ConnectException;
 import java.net.SocketTimeoutException;
 import java.net.URI;
@@ -1107,7 +1108,11 @@ private static Exception extractAndWrapCause(Exception exception) {
             if (t instanceof Error) {
                 throw (Error) t;
             }
-            exception = (Exception) t;
+            if (t instanceof Exception) {
+                exception = (Exception) t;
+            } else {
+                exception = new UndeclaredThrowableException(t);
+            }
         }
         if (exception instanceof ConnectTimeoutException) {
             ConnectTimeoutException e = new ConnectTimeoutException(exception.getMessage());