davsclaus commented on code in PR #27173:
URL: https://github.com/apache/camel/pull/27173#discussion_r4240437291


##########
components/camel-sjms/src/test/java/org/apache/camel/component/sjms/batch/BatchConsumerReconnectTest.java:
##########
@@ -0,0 +1,184 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.camel.component.sjms.batch;
+
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.activemq.artemis.jms.client.ActiveMQConnectionFactory;
+import org.apache.camel.CamelContext;
+import org.apache.camel.RoutesBuilder;
+import org.apache.camel.component.mock.MockEndpoint;
+import org.apache.camel.component.sjms.SjmsComponent;
+import org.apache.camel.component.sjms.support.JmsExclusiveTestSupport;
+import org.apache.camel.test.infra.artemis.services.ArtemisService;
+import org.apache.camel.test.infra.artemis.services.ArtemisServiceFactory;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import static java.lang.String.format;
+import static 
org.apache.camel.component.sjms.batch.BatchTestHelper.BATCH_ROUTEBUILDER_MOCK_FINISH;
+import static 
org.apache.camel.component.sjms.batch.BatchTestHelper.createBatchRoute;
+import static 
org.apache.camel.component.sjms.batch.BatchTestHelper.getBatchBodiesAsString;
+import static 
org.apache.camel.component.sjms.batch.BatchTestHelper.getBatchExchanges;
+import static 
org.apache.camel.component.sjms.batch.BatchTestHelper.sendMessagesWithText;
+import static 
org.apache.camel.component.sjms.batch.BatchTestHelper.triggerConnectionFailure;
+import static org.awaitility.Awaitility.await;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class BatchConsumerReconnectTest extends JmsExclusiveTestSupport {
+
+    private static final String SJMS_QUEUE_NAME_TEMPLATE = 
"batch.consumer.%s.BatchConsumerReconnectTest";
+    private static final String ROUTE_ID_SESSION_TX = "tx";
+    private static final String ROUTE_ID_CLIENT_ACK_NO_TX = "no-tx-client-ack";
+    private static final String ROUTE_ID_AUTO_ACK_NO_TX = "no-tx-auto";
+
+    @RegisterExtension
+    public static ArtemisService service = 
ArtemisServiceFactory.createVMService();
+
+    private BatchTestHelper.CountingConnectionFactory countingFactory;
+
+    protected final Logger log = LoggerFactory.getLogger(getClass());
+
+    @Override
+    public ArtemisService getService() {
+        return service;
+    }
+
+    @Override
+    protected CamelContext createCamelContext() throws Exception {
+        addSjmsComponent = false;
+        CamelContext camelContext = super.createCamelContext();
+
+        ActiveMQConnectionFactory connectionFactory = new 
ActiveMQConnectionFactory(service.serviceAddress());
+        connectionFactory.setReconnectAttempts(0);
+
+        countingFactory = new 
BatchTestHelper.CountingConnectionFactory(connectionFactory);
+
+        SjmsComponent sjms = new SjmsComponent();
+        sjms.setConnectionFactory(countingFactory);
+        camelContext.addComponent("sjms", sjms);
+
+        return camelContext;
+    }
+
+    @Test
+    public void testReconnectAutoAcknowledgedNotTransacted() throws Exception {
+        final String queueName = format(SJMS_QUEUE_NAME_TEMPLATE, 
ROUTE_ID_AUTO_ACK_NO_TX);
+        final String endpointUri = "sjms:queue:" + queueName;
+
+        MockEndpoint mock = 
getMockEndpoint(format(BATCH_ROUTEBUILDER_MOCK_FINISH, 
ROUTE_ID_AUTO_ACK_NO_TX));
+        mock.expectedMessageCount(1);
+
+        sendMessagesWithText(template, endpointUri, 2, "Before!");
+
+        int connectionsBefore = countingFactory.getCreateCount();
+        triggerConnectionFailure(context, ROUTE_ID_AUTO_ACK_NO_TX);
+        await().atMost(30, TimeUnit.SECONDS)
+                .until(() -> countingFactory.getCreateCount() > 
connectionsBefore);
+
+        mock.assertIsSatisfied();
+        assertEquals(2, getBatchExchanges(mock.getExchanges().get(0)).size());
+        assertEquals(List.of("Before!", "Before!"), 
getBatchBodiesAsString(mock.getExchanges().get(0)));
+
+        mock.reset();
+
+        // test with an incomplete batch - to check timing
+        mock.expectedMessageCount(1);
+        mock.setResultWaitTime(15000);
+        sendMessagesWithText(template, endpointUri, 3, "After!");
+
+        mock.assertIsSatisfied();
+        assertEquals(3, getBatchExchanges(mock.getExchanges().get(0)).size());
+        assertEquals(List.of("After!", "After!", "After!"), 
getBatchBodiesAsString(mock.getExchanges().get(0)));
+    }
+
+    @Test
+    public void testSessionTransacted() throws Exception {
+        final String queueName = format(SJMS_QUEUE_NAME_TEMPLATE, 
ROUTE_ID_SESSION_TX);
+        final String endpointUri = "sjms:queue:" + queueName;
+
+        MockEndpoint mock = 
getMockEndpoint(format(BATCH_ROUTEBUILDER_MOCK_FINISH, ROUTE_ID_SESSION_TX));
+        mock.expectedMessageCount(0);
+
+        sendMessagesWithText(template, endpointUri, 2, "Before!");
+
+        int connectionsBefore = countingFactory.getCreateCount();
+        triggerConnectionFailure(context, ROUTE_ID_AUTO_ACK_NO_TX);

Review Comment:
   This is the session-transacted test, but it still triggers the failure on 
the auto-ack route, so the transacted reconnect isn't exercised:
   ```suggestion
           triggerConnectionFailure(context, ROUTE_ID_SESSION_TX);
   ```



##########
components/camel-sjms/src/main/java/org/apache/camel/component/sjms/consumer/BatchConsumerWorker.java:
##########
@@ -0,0 +1,183 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.camel.component.sjms.consumer;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import jakarta.jms.JMSException;
+import jakarta.jms.Message;
+import jakarta.jms.MessageConsumer;
+import jakarta.jms.Session;
+
+import org.apache.camel.component.sjms.SjmsEndpoint;
+import org.apache.camel.component.sjms.jms.SessionAcknowledgementType;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import static org.apache.camel.component.sjms.SjmsHelper.commitIfNeeded;
+import static org.apache.camel.component.sjms.SjmsHelper.rollbackIfNeeded;
+
+public class BatchConsumerWorker implements Runnable {
+
+    private static final Logger LOG = 
LoggerFactory.getLogger(BatchConsumerWorker.class);
+
+    private static final long JMS_CONSUMER_RECEIVE_WAKE_INTERVAL_TIMEOUT = 
1000L;
+    private static final long JMS_CONSUMER_RECEIVE_MIN_TIMEOUT = 100L;
+
+    private final SjmsEndpoint endpoint;
+    private final BatchEndpointMessageListener batchListener;
+    private final MessageConsumer consumer;
+    private final Session session;
+    private final AtomicBoolean running = new AtomicBoolean(true);
+    private volatile boolean jmsUnhealthy;
+
+    BatchConsumerWorker(SjmsEndpoint endpoint, BatchEndpointMessageListener 
batchListener,
+                        Session session, MessageConsumer consumer) {
+        this.endpoint = endpoint;
+        this.batchListener = batchListener;
+        this.session = session;
+        this.consumer = consumer;
+    }
+
+    void shutdown() {
+        LOG.debug("Shutdown requested");
+        running.set(false);
+    }
+
+    boolean isShutdownRequested() {
+        return !running.get();
+    }
+
+    void invalidate() {
+        jmsUnhealthy = true;
+        shutdown();
+    }
+
+    private boolean isRedeliverable() {
+        return endpoint.isTransacted()
+                || endpoint.getAcknowledgementMode() == 
SessionAcknowledgementType.CLIENT_ACKNOWLEDGE;
+    }
+
+    @Override
+    public void run() {
+        LOG.debug("run START");
+        int batchSize = endpoint.getBatchSize();
+        long batchInterval = endpoint.getBatchInterval();
+        List<Message> buffer = new ArrayList<>();
+        long batchStartTime = 0L;
+
+        try {
+            while (running.get()) {
+                long waitMillis
+                        = computeWaitMillis(buffer.isEmpty(), batchStartTime, 
batchInterval);
+
+                Message msg = consumer.receive(waitMillis);
+
+                if (msg != null) {
+                    if (buffer.isEmpty()) {
+                        batchStartTime = System.nanoTime();
+                    }
+                    buffer.add(msg);
+                }
+
+                boolean sizeReached = batchSize > 0 && buffer.size() >= 
batchSize;
+                boolean intervalElapsed = batchInterval > 0 && 
!buffer.isEmpty()
+                        && TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - 
batchStartTime) >= batchInterval;
+
+                if (sizeReached || intervalElapsed) {
+                    dispatchOrDiscard(buffer);
+                    buffer = new ArrayList<>();
+                }
+            }
+
+            if (!buffer.isEmpty()) {
+                dispatchOrDiscard(buffer); // graceful-stop drain
+            }
+        } catch (JMSException e) {
+            jmsUnhealthy = true;
+            if (!buffer.isEmpty()) {
+                dispatchOrDiscard(buffer);
+            }
+            throw new BatchConsumerWorkerException(e);
+        }
+        LOG.info("run STOP");
+    }
+
+    private void dispatchOrDiscard(List<Message> batch) {
+        if (jmsUnhealthy) {
+            if (isRedeliverable()) {
+                LOG.warn("JMS is unhealthy on {}: discarding {} buffered 
message(s); "
+                         + "unacknowledged/uncommitted, will be redelivered",
+                        endpoint.getEndpointUri(), batch.size());
+                return;
+            }
+            LOG.warn("JMS is unhealthy on {}: attempting best-effort dispatch 
of {} already-acknowledged "
+                     + "message(s) since they cannot be redelivered",
+                    endpoint.getEndpointUri(), batch.size());
+        }
+        onBatch(batch);
+    }
+
+    private void onBatch(List<Message> batch) {
+        try {
+            doOnBatch(batch);
+        } catch (Exception e) {
+            if (e instanceof JMSException jmsException) {
+                if (endpoint.getExceptionListener() != null) {
+                    endpoint.getExceptionListener().onException(jmsException);
+                } else {
+                    LOG.warn("JMS exception on {} (no ExceptionListener 
configured); recovery will be attempted",

Review Comment:
   Nothing on this path triggers recovery: the worker keeps running and 
recovery only happens if a later `receive()` throws (a failed commit/ack 
usually leaves the session usable). Suggest rewording, e.g. `"JMS exception 
while committing/acknowledging batch on {} (no ExceptionListener configured)"`, 
or invalidate the worker if recovery is intended.



##########
components/camel-sjms/src/test/java/org/apache/camel/component/sjms/batch/BatchConsumerReconnectTest.java:
##########
@@ -0,0 +1,184 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.camel.component.sjms.batch;
+
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.activemq.artemis.jms.client.ActiveMQConnectionFactory;
+import org.apache.camel.CamelContext;
+import org.apache.camel.RoutesBuilder;
+import org.apache.camel.component.mock.MockEndpoint;
+import org.apache.camel.component.sjms.SjmsComponent;
+import org.apache.camel.component.sjms.support.JmsExclusiveTestSupport;
+import org.apache.camel.test.infra.artemis.services.ArtemisService;
+import org.apache.camel.test.infra.artemis.services.ArtemisServiceFactory;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import static java.lang.String.format;
+import static 
org.apache.camel.component.sjms.batch.BatchTestHelper.BATCH_ROUTEBUILDER_MOCK_FINISH;
+import static 
org.apache.camel.component.sjms.batch.BatchTestHelper.createBatchRoute;
+import static 
org.apache.camel.component.sjms.batch.BatchTestHelper.getBatchBodiesAsString;
+import static 
org.apache.camel.component.sjms.batch.BatchTestHelper.getBatchExchanges;
+import static 
org.apache.camel.component.sjms.batch.BatchTestHelper.sendMessagesWithText;
+import static 
org.apache.camel.component.sjms.batch.BatchTestHelper.triggerConnectionFailure;
+import static org.awaitility.Awaitility.await;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class BatchConsumerReconnectTest extends JmsExclusiveTestSupport {
+
+    private static final String SJMS_QUEUE_NAME_TEMPLATE = 
"batch.consumer.%s.BatchConsumerReconnectTest";
+    private static final String ROUTE_ID_SESSION_TX = "tx";
+    private static final String ROUTE_ID_CLIENT_ACK_NO_TX = "no-tx-client-ack";
+    private static final String ROUTE_ID_AUTO_ACK_NO_TX = "no-tx-auto";
+
+    @RegisterExtension
+    public static ArtemisService service = 
ArtemisServiceFactory.createVMService();
+
+    private BatchTestHelper.CountingConnectionFactory countingFactory;
+
+    protected final Logger log = LoggerFactory.getLogger(getClass());
+
+    @Override
+    public ArtemisService getService() {
+        return service;
+    }
+
+    @Override
+    protected CamelContext createCamelContext() throws Exception {
+        addSjmsComponent = false;
+        CamelContext camelContext = super.createCamelContext();
+
+        ActiveMQConnectionFactory connectionFactory = new 
ActiveMQConnectionFactory(service.serviceAddress());
+        connectionFactory.setReconnectAttempts(0);
+
+        countingFactory = new 
BatchTestHelper.CountingConnectionFactory(connectionFactory);
+
+        SjmsComponent sjms = new SjmsComponent();
+        sjms.setConnectionFactory(countingFactory);
+        camelContext.addComponent("sjms", sjms);
+
+        return camelContext;
+    }
+
+    @Test
+    public void testReconnectAutoAcknowledgedNotTransacted() throws Exception {
+        final String queueName = format(SJMS_QUEUE_NAME_TEMPLATE, 
ROUTE_ID_AUTO_ACK_NO_TX);
+        final String endpointUri = "sjms:queue:" + queueName;
+
+        MockEndpoint mock = 
getMockEndpoint(format(BATCH_ROUTEBUILDER_MOCK_FINISH, 
ROUTE_ID_AUTO_ACK_NO_TX));
+        mock.expectedMessageCount(1);
+
+        sendMessagesWithText(template, endpointUri, 2, "Before!");
+
+        int connectionsBefore = countingFactory.getCreateCount();
+        triggerConnectionFailure(context, ROUTE_ID_AUTO_ACK_NO_TX);
+        await().atMost(30, TimeUnit.SECONDS)
+                .until(() -> countingFactory.getCreateCount() > 
connectionsBefore);
+
+        mock.assertIsSatisfied();
+        assertEquals(2, getBatchExchanges(mock.getExchanges().get(0)).size());
+        assertEquals(List.of("Before!", "Before!"), 
getBatchBodiesAsString(mock.getExchanges().get(0)));
+
+        mock.reset();
+
+        // test with an incomplete batch - to check timing
+        mock.expectedMessageCount(1);
+        mock.setResultWaitTime(15000);
+        sendMessagesWithText(template, endpointUri, 3, "After!");
+
+        mock.assertIsSatisfied();
+        assertEquals(3, getBatchExchanges(mock.getExchanges().get(0)).size());
+        assertEquals(List.of("After!", "After!", "After!"), 
getBatchBodiesAsString(mock.getExchanges().get(0)));
+    }
+
+    @Test
+    public void testSessionTransacted() throws Exception {
+        final String queueName = format(SJMS_QUEUE_NAME_TEMPLATE, 
ROUTE_ID_SESSION_TX);
+        final String endpointUri = "sjms:queue:" + queueName;
+
+        MockEndpoint mock = 
getMockEndpoint(format(BATCH_ROUTEBUILDER_MOCK_FINISH, ROUTE_ID_SESSION_TX));
+        mock.expectedMessageCount(0);
+
+        sendMessagesWithText(template, endpointUri, 2, "Before!");
+
+        int connectionsBefore = countingFactory.getCreateCount();
+        triggerConnectionFailure(context, ROUTE_ID_AUTO_ACK_NO_TX);
+        await().atMost(30, TimeUnit.SECONDS)
+                .until(() -> countingFactory.getCreateCount() > 
connectionsBefore);
+
+        mock.assertIsSatisfied();
+        mock.reset();
+
+        // we want to test with 1 complete (incl. the messages prior to 
reconnect) and 1 incomplete batch
+        mock.expectedMessageCount(2);
+        mock.setResultWaitTime(15000);
+        sendMessagesWithText(template, endpointUri, 7, "After!");
+
+        mock.assertIsSatisfied();
+        // fist batch

Review Comment:
   ```suggestion
           // first batch
   ```



##########
components/camel-sjms/src/main/java/org/apache/camel/component/sjms/consumer/BatchConsumerWorker.java:
##########
@@ -0,0 +1,183 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.camel.component.sjms.consumer;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import jakarta.jms.JMSException;
+import jakarta.jms.Message;
+import jakarta.jms.MessageConsumer;
+import jakarta.jms.Session;
+
+import org.apache.camel.component.sjms.SjmsEndpoint;
+import org.apache.camel.component.sjms.jms.SessionAcknowledgementType;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import static org.apache.camel.component.sjms.SjmsHelper.commitIfNeeded;
+import static org.apache.camel.component.sjms.SjmsHelper.rollbackIfNeeded;
+
+public class BatchConsumerWorker implements Runnable {
+
+    private static final Logger LOG = 
LoggerFactory.getLogger(BatchConsumerWorker.class);
+
+    private static final long JMS_CONSUMER_RECEIVE_WAKE_INTERVAL_TIMEOUT = 
1000L;
+    private static final long JMS_CONSUMER_RECEIVE_MIN_TIMEOUT = 100L;
+
+    private final SjmsEndpoint endpoint;
+    private final BatchEndpointMessageListener batchListener;
+    private final MessageConsumer consumer;
+    private final Session session;
+    private final AtomicBoolean running = new AtomicBoolean(true);
+    private volatile boolean jmsUnhealthy;
+
+    BatchConsumerWorker(SjmsEndpoint endpoint, BatchEndpointMessageListener 
batchListener,
+                        Session session, MessageConsumer consumer) {
+        this.endpoint = endpoint;
+        this.batchListener = batchListener;
+        this.session = session;
+        this.consumer = consumer;
+    }
+
+    void shutdown() {
+        LOG.debug("Shutdown requested");
+        running.set(false);
+    }
+
+    boolean isShutdownRequested() {
+        return !running.get();
+    }
+
+    void invalidate() {
+        jmsUnhealthy = true;
+        shutdown();
+    }
+
+    private boolean isRedeliverable() {
+        return endpoint.isTransacted()
+                || endpoint.getAcknowledgementMode() == 
SessionAcknowledgementType.CLIENT_ACKNOWLEDGE;
+    }
+
+    @Override
+    public void run() {
+        LOG.debug("run START");
+        int batchSize = endpoint.getBatchSize();
+        long batchInterval = endpoint.getBatchInterval();
+        List<Message> buffer = new ArrayList<>();
+        long batchStartTime = 0L;
+
+        try {
+            while (running.get()) {
+                long waitMillis
+                        = computeWaitMillis(buffer.isEmpty(), batchStartTime, 
batchInterval);
+
+                Message msg = consumer.receive(waitMillis);
+
+                if (msg != null) {
+                    if (buffer.isEmpty()) {
+                        batchStartTime = System.nanoTime();
+                    }
+                    buffer.add(msg);
+                }
+
+                boolean sizeReached = batchSize > 0 && buffer.size() >= 
batchSize;
+                boolean intervalElapsed = batchInterval > 0 && 
!buffer.isEmpty()
+                        && TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - 
batchStartTime) >= batchInterval;
+
+                if (sizeReached || intervalElapsed) {
+                    dispatchOrDiscard(buffer);
+                    buffer = new ArrayList<>();
+                }
+            }
+
+            if (!buffer.isEmpty()) {
+                dispatchOrDiscard(buffer); // graceful-stop drain
+            }
+        } catch (JMSException e) {
+            jmsUnhealthy = true;
+            if (!buffer.isEmpty()) {
+                dispatchOrDiscard(buffer);
+            }
+            throw new BatchConsumerWorkerException(e);
+        }
+        LOG.info("run STOP");
+    }
+
+    private void dispatchOrDiscard(List<Message> batch) {
+        if (jmsUnhealthy) {
+            if (isRedeliverable()) {
+                LOG.warn("JMS is unhealthy on {}: discarding {} buffered 
message(s); "
+                         + "unacknowledged/uncommitted, will be redelivered",
+                        endpoint.getEndpointUri(), batch.size());
+                return;
+            }
+            LOG.warn("JMS is unhealthy on {}: attempting best-effort dispatch 
of {} already-acknowledged "
+                     + "message(s) since they cannot be redelivered",
+                    endpoint.getEndpointUri(), batch.size());
+        }
+        onBatch(batch);
+    }
+
+    private void onBatch(List<Message> batch) {
+        try {
+            doOnBatch(batch);
+        } catch (Exception e) {
+            if (e instanceof JMSException jmsException) {
+                if (endpoint.getExceptionListener() != null) {
+                    endpoint.getExceptionListener().onException(jmsException);
+                } else {
+                    LOG.warn("JMS exception on {} (no ExceptionListener 
configured); recovery will be attempted",
+                            endpoint.getEndpointUri(), jmsException);
+                }
+            } else {
+                batchListener.handleException(
+                        "Execution of JMS message listener failed. This 
exception is ignored.",

Review Comment:
   This is no longer true: with `bridgeErrorHandler` or a custom handler the 
exception can be acted on (gnodet raised this too).
   ```suggestion
                           "Execution of batch JMS message listener failed.",
   ```



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