Sb t2 schedule multiple message validate batch size

sdk/servicebus/azure-messaging-servicebus/src/main/java/com/azure/messaging/servicebus/ServiceBusSenderAsyncClient.java

@@ -371,26 +371,25 @@ public Flux<Long> scheduleMessages(Iterable<ServiceBusMessage> messages, OffsetD
             return fluxError(logger, new NullPointerException("'scheduledEnqueueTime' cannot be null."));
         }
 
-        return getSendLink().flatMapMany(link -> createMessageBatch()
-            .flatMapMany(messageBatch -> {
+        return createMessageBatch()
+            .map(messageBatch -> {
                 int index = 0;
                 for (ServiceBusMessage message : messages) {
                     if (!messageBatch.tryAddMessage(message)) {
                         final String error = String.format(Locale.US,
                             "Messages exceed max allowed size for all the messages together. "
                                 + "Failed to add message at index '%s'.", index);
-                        throw logger.logExceptionAsError(new AmqpException(false,
-                            AmqpErrorCondition.LINK_PAYLOAD_SIZE_EXCEEDED, error, link.getErrorContext()));
+                        throw logger.logExceptionAsError(new IllegalArgumentException(error));
                     }
                     ++index;
                 }
-
-                return connectionProcessor
-                    .flatMap(connection -> connection.getManagementNode(entityName, entityType))
-                    .flatMapMany(managementNode -> managementNode.schedule(messageBatch.getMessages(),
-                        scheduledEnqueueTime, messageBatch.getMaxSizeInBytes(), link.getLinkName(),
-                        transactionContext));
-            }));
+                return messageBatch;
+            })
+            .flatMapMany(messageBatch -> connectionProcessor
+                .flatMap(connection -> connection.getManagementNode(entityName, entityType))
+                .flatMapMany(managementNode -> managementNode.schedule(messageBatch.getMessages(), scheduledEnqueueTime,
+                    messageBatch.getMaxSizeInBytes(), linkName.get(), transactionContext))
+            );
     }
 
     /**

sdk/servicebus/azure-messaging-servicebus/src/test/java/com/azure/messaging/servicebus/ServiceBusSenderAsyncClientTest.java

@@ -70,9 +70,8 @@
 import static com.azure.messaging.servicebus.implementation.ServiceBusConstants.AZ_TRACING_SERVICE_NAME;
 import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.jupiter.api.Assertions.assertSame;
-import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyInt;
 import static org.mockito.ArgumentMatchers.anyList;
 import static org.mockito.ArgumentMatchers.anyString;
 import static org.mockito.ArgumentMatchers.argThat;
@@ -308,13 +307,12 @@ void scheduleMessageSizeTooBig() {
 
         // Act & Assert
         StepVerifier.create(sender.scheduleMessages(messages, instant))
-            .verifyErrorMatches(throwable -> {
-                assertTrue(throwable instanceof  AmqpException);
-                assertSame(((AmqpException) throwable).getErrorCondition(), AmqpErrorCondition.LINK_PAYLOAD_SIZE_EXCEEDED);
-                return true;
-            });
+            .verifyError(IllegalArgumentException.class);
+
+        verify(managementNode, never()).schedule(any(), eq(instant), anyInt(), eq(LINK_NAME), isNull());
     }
-
+
+
     /**
      * Verifies that sending multiple message will result in calling sender.send(MessageBatch, transaction).
      */