tkaymak commented on code in PR #39253:
URL: https://github.com/apache/beam/pull/39253#discussion_r3595797109


##########
sdks/java/io/jms/src/main/java/org/apache/beam/sdk/io/jms/JmsCheckpointMark.java:
##########
@@ -41,29 +45,32 @@ class JmsCheckpointMark implements 
UnboundedSource.CheckpointMark, Serializable
   private static final Logger LOG = 
LoggerFactory.getLogger(JmsCheckpointMark.class);
 
   private Instant oldestMessageTimestamp;
-  private transient @Nullable Message lastMessage;
+  private transient @Nullable List<Message> messages;
   private transient @Nullable MessageConsumer consumer;
   private transient @Nullable Session session;
+  private transient @Nullable AtomicInteger activeCheckpoints;
 
   private JmsCheckpointMark(
       Instant oldestMessageTimestamp,
-      @Nullable Message lastMessage,
+      @Nullable List<Message> messages,
       @Nullable MessageConsumer consumer,
-      @Nullable Session session) {
+      @Nullable Session session,
+      @Nullable AtomicInteger activeCheckpoints) {
     this.oldestMessageTimestamp = oldestMessageTimestamp;
-    this.lastMessage = lastMessage;
+    this.messages = messages;
     this.consumer = consumer;
     this.session = session;
+    this.activeCheckpoints = activeCheckpoints;
   }
 
   /** Acknowledge all outstanding message. */
   @Override
   public void finalizeCheckpoint() {
     try {
-      // Jms spec will implicitly acknowledge _all_ messaged already received 
by the same
-      // session if one message in this session is being acknowledged.
-      if (lastMessage != null) {
-        lastMessage.acknowledge();
+      if (messages != null) {
+        for (Message message : messages) {
+          message.acknowledge();

Review Comment:
   @Abacn this is my only remaining point otherwise I can also approve it, just 
let me know! 



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