DLQ for topics with Spring Boot - spring

Question

I'm using Spring Boot and ActiveMQ. I want to send and receive messages from a topic. This is working well. My code looks like this:
#RunWith(SpringRunner.class)
#SpringBootTest(classes = {
JmsSpike.TestListener1.class,
JmsSpike.TestListener2.class,
JmsSpike.Config.class
})
#TestPropertySource(properties = {
"spring.activemq.broker-url: tcp://localhost:61616",
"spring.activemq.password: admin",
"spring.activemq.user: admin",
"spring.jms.pub-sub-domain: true", // queue vs. topic
})
#EnableJms
#EnableAutoConfiguration
public class JmsSpike {
#Autowired
private JmsTemplate jmsTemplate;
#Test
public void sendMessage() throws Exception {
sendMessageInThread();
Thread.sleep(10000);
}
private void sendMessageInThread() {
new Thread() {
public void run() {
jmsTemplate.convertAndSend("asx2ras", "I'm a test");
}
}.start();
}
#TestComponent
protected static class TestListener1 {
#JmsListener(destination = "asx2ras")
public void receiveMessage(String message) {
System.out.println("****************** 1 *******************");
System.out.println("Hey 1! I got a message: " + message);
System.out.println("****************** 1 *******************");
}
}
#TestComponent
protected static class TestListener2 {
#JmsListener(destination = "asx2ras")
public void receiveMessage(String message) {
throw new RuntimeException("Nope");
}
}
#Configuration
protected static class Config {
#Bean
public RedeliveryPolicy redeliveryPolicy() {
RedeliveryPolicy topicPolicy = new RedeliveryPolicy();
topicPolicy.setMaximumRedeliveries(1);
return topicPolicy;
}
#Bean
public ConnectionFactory connectionFactory(#Value("${spring.activemq.user}") final String username,
#Value("${spring.activemq.password}") final String password,
#Value("${spring.activemq.broker-url}") final String brokerUrl) {
ActiveMQConnectionFactory cf = new ActiveMQConnectionFactory(username, password, brokerUrl);
cf.setRedeliveryPolicy(redeliveryPolicy());
return cf;
}
}
}
I can send a message
I receive the message with both listeners
One listener will always work and just print some console message
The other listener will always throw an exception
I set the retry to "1", so the failing listener will be called one more time after the exception was thrown. However, after the retry, the message is not delivered to an error queue (or error topic). How can I send the message to an error queue so that I can call the failing listener again later?
Note that I only want to call the failing listener again, not all listeners on the topic. Is that possible?
EDIT
Here's my activemq.xml (just the broker tag):
<broker xmlns="http://activemq.apache.org/schema/core" brokerName="localhost" dataDirectory="${activemq.data}">
<destinationPolicy>
<policyMap>
<policyEntries>
<policyEntry topic=">" >
<pendingMessageLimitStrategy>
<constantPendingMessageLimitStrategy limit="1000"/>
</pendingMessageLimitStrategy>
</policyEntry>
</policyEntries>
</policyMap>
</destinationPolicy>
<managementContext>
<managementContext createConnector="false"/>
</managementContext>
<persistenceAdapter>
<kahaDB directory="${activemq.data}/kahadb"/>
</persistenceAdapter>
<systemUsage>
<systemUsage>
<memoryUsage>
<memoryUsage percentOfJvmHeap="70" />
</memoryUsage>
<storeUsage>
<storeUsage limit="100 gb"/>
</storeUsage>
<tempUsage>
<tempUsage limit="50 gb"/>
</tempUsage>
</systemUsage>
</systemUsage>
<transportConnectors>
<!-- DOS protection, limit concurrent connections to 1000 and frame size to 100MB -->
<transportConnector name="openwire" uri="tcp://0.0.0.0:61616?maximumConnections=1000&wireFormat.maxFrameSize=104857600"/>
<transportConnector name="amqp" uri="amqp://0.0.0.0:5672?maximumConnections=1000&wireFormat.maxFrameSize=104857600"/>
<transportConnector name="stomp" uri="stomp://0.0.0.0:61613?maximumConnections=1000&wireFormat.maxFrameSize=104857600"/>
<transportConnector name="mqtt" uri="mqtt://0.0.0.0:1883?maximumConnections=1000&wireFormat.maxFrameSize=104857600"/>
<transportConnector name="ws" uri="ws://0.0.0.0:61614?maximumConnections=1000&wireFormat.maxFrameSize=104857600"/>
</transportConnectors>
<shutdownHooks>
<bean xmlns="http://www.springframework.org/schema/beans" class="org.apache.activemq.hooks.SpringContextHook" />
</shutdownHooks>
</broker>

Answer 1

According to the official documentation, you can override the broker configurations on the client side:
The broker transmits the default delivery policy that he prefers to a
client connection in his BrokerInfo command packet. But the client can
override the policy settings by using the
ActiveMQConnection.getRedeliveryPolicy() method:
RedeliveryPolicy policy = connection.getRedeliveryPolicy();
policy.setInitialRedeliveryDelay(500); policy.setBackOffMultiplier(2);
policy.setUseExponentialBackOff(true);
policy.setMaximumRedeliveries(2);
So, the way you have configured the redelivery policy seems OK.
The only issue that I see is when you create a new instance of RedeliveryPolicy and set only a single field topicPolicy.setMaximumRedeliveries(1); all other fields that are primitives will be assigned default values. You should probably set the maximum redeliveries on the existing instance of redelivery policy:
RedeliveryPolicy policy = cf.getRedeliveryPolicy();
policy.setMaximumRedeliveries(1);
Edit
Also, make sure that by using #JmsListener is not using CLIENT_ACKNOWLEDGE. According to this thread the messages will not get redelivered when CLIENT_ACKNOWLEDGE is used.