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new b3f861c41b fix(jmx): avoid NPE in ConnectionView.getWireFormatInfo
(#2270)
b3f861c41b is described below
commit b3f861c41b52a07a54e62b3f79052735221b74bd
Author: dev_Hakaze <[email protected]>
AuthorDate: Thu Sep 3 19:44:04 2026 +0700
fix(jmx): avoid NPE in ConnectionView.getWireFormatInfo (#2270)
getRemoteWireFormatInfo() can be null before wire-format negotiation
completes (or for transports that never set it). Calling toString() on
that null caused an NPE when the JMX attribute was read.
Return the existing "WireFormatInfo not available" placeholder when the
remote WireFormatInfo is missing.
Fixes #2203
Co-authored-by: arimu1 <[email protected]>
---
.../apache/activemq/broker/jmx/ConnectionView.java | 6 +-
.../activemq/broker/jmx/ConnectionViewTest.java | 104 +++++++++++++++++++++
2 files changed, 108 insertions(+), 2 deletions(-)
diff --git
a/activemq-broker/src/main/java/org/apache/activemq/broker/jmx/ConnectionView.java
b/activemq-broker/src/main/java/org/apache/activemq/broker/jmx/ConnectionView.java
index 6106471821..1bce83423a 100644
---
a/activemq-broker/src/main/java/org/apache/activemq/broker/jmx/ConnectionView.java
+++
b/activemq-broker/src/main/java/org/apache/activemq/broker/jmx/ConnectionView.java
@@ -23,6 +23,7 @@ import javax.management.ObjectName;
import org.apache.activemq.broker.Connection;
import org.apache.activemq.broker.TransportConnection;
+import org.apache.activemq.command.WireFormatInfo;
import org.apache.activemq.util.IOExceptionSupport;
public class ConnectionView implements ConnectionViewMBean {
@@ -201,8 +202,9 @@ public class ConnectionView implements ConnectionViewMBean {
@Override
public String getWireFormatInfo() {
- if(connection instanceof TransportConnection) {
- return
((TransportConnection)connection).getRemoteWireFormatInfo().toString();
+ if (connection instanceof TransportConnection) {
+ WireFormatInfo info = ((TransportConnection)
connection).getRemoteWireFormatInfo();
+ return (info != null) ? info.toString() : "WireFormatInfo not
available";
}
return "WireFormatInfo not available";
}
diff --git
a/activemq-broker/src/test/java/org/apache/activemq/broker/jmx/ConnectionViewTest.java
b/activemq-broker/src/test/java/org/apache/activemq/broker/jmx/ConnectionViewTest.java
new file mode 100644
index 0000000000..dadb9c77a0
--- /dev/null
+++
b/activemq-broker/src/test/java/org/apache/activemq/broker/jmx/ConnectionViewTest.java
@@ -0,0 +1,104 @@
+/**
+ * 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.activemq.broker.jmx;
+
+import org.apache.activemq.ActiveMQConnectionFactory;
+import org.apache.activemq.broker.BrokerService;
+import org.apache.activemq.broker.TransportConnection;
+import org.apache.activemq.broker.TransportConnector;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import jakarta.jms.Connection;
+import java.lang.reflect.Field;
+import java.net.URI;
+import java.util.concurrent.CopyOnWriteArrayList;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotNull;
+
+/**
+ * Regression tests for ConnectionView JMX attribute accessors.
+ */
+public class ConnectionViewTest {
+
+ private BrokerService broker;
+ private URI brokerConnectURI;
+
+ @Before
+ public void startBroker() throws Exception {
+ broker = new BrokerService();
+ broker.setPersistent(false);
+
+ TransportConnector connector = broker.addConnector(new
TransportConnector());
+ connector.setUri(new URI("tcp://0.0.0.0:0"));
+ connector.setName("tcp");
+
+ broker.start();
+ broker.waitUntilStarted();
+
+ brokerConnectURI = broker.getConnectorByName("tcp").getConnectUri();
+ }
+
+ @After
+ public void stopBroker() throws Exception {
+ if (broker != null) {
+ broker.stop();
+ broker.waitUntilStopped();
+ }
+ }
+
+ @Test
+ public void testGetWireFormatInfoWhenPresent() throws Exception {
+ Connection connection = new
ActiveMQConnectionFactory(brokerConnectURI).createConnection();
+ connection.start();
+ try {
+ ConnectionView view = new ConnectionView(getTransportConnection());
+ String info = view.getWireFormatInfo();
+ assertNotNull(info);
+ assertFalse("WireFormatInfo not available".equals(info));
+ } finally {
+ connection.stop();
+ }
+ }
+
+ @Test
+ public void testGetWireFormatInfoWhenRemoteInfoNull() throws Exception {
+ Connection connection = new
ActiveMQConnectionFactory(brokerConnectURI).createConnection();
+ connection.start();
+ try {
+ TransportConnection transportConnection = getTransportConnection();
+ Field field =
TransportConnection.class.getDeclaredField("wireFormatInfo");
+ field.setAccessible(true);
+ field.set(transportConnection, null);
+
+ ConnectionView view = new ConnectionView(transportConnection);
+ assertEquals("WireFormatInfo not available",
view.getWireFormatInfo());
+ } finally {
+ connection.stop();
+ }
+ }
+
+ private TransportConnection getTransportConnection() {
+ CopyOnWriteArrayList<TransportConnection> connections =
+ broker.getConnectorByName("tcp").getConnections();
+ assertEquals(1, connections.size());
+ return connections.get(0);
+ }
+}
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