ActiveMQ - is it possible to acknowledge single message in CLIENT_ACKNOWLEDGE mode - jms

Question

According to http://docs.oracle.com/javaee/6/api/javax/jms/Message.html#acknowledge()
A client may individually acknowledge each message as it is consumed, or it may choose to acknowledge messages as an application-defined group (which is done by calling acknowledge on the last received message of the group, thereby acknowledging all messages consumed by the session.)
How can I do it in ActiveMQ? I was unable to make it work.

Answer 1

here is example with ActiveMQ client,
import javax.jms.Connection;
import javax.jms.JMSException;
import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.ActiveMQMessageConsumer;
import org.apache.activemq.ActiveMQSession;
import org.apache.activemq.command.ActiveMQTextMessage;
public class SimpleConsumer {
public static void main(String[] args) throws JMSException {
Connection conn = null;
try {
ActiveMQConnectionFactory cf = new ActiveMQConnectionFactory("tcp://localhost:61616");
conn = cf.createConnection("consumer", "consumer");
ActiveMQSession session = (ActiveMQSession) conn.createSession(false,
ActiveMQSession.INDIVIDUAL_ACKNOWLEDGE);
ActiveMQMessageConsumer consumer = (ActiveMQMessageConsumer) session
.createConsumer(session.createQueue("QUEUE"));
conn.start();
ActiveMQTextMessage msg = null;
while ((msg = (ActiveMQTextMessage) consumer.receive()) != null) {
System.out.println("Received message is: " + msg.getText());
msg.acknowledge();
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (conn != null) {
try {
conn.close();
} catch (Exception e) {
}
}
}
}
}

Answer 2

I am correcting my answer after the below comments with Matt Pavlovich.
CLIENT_ACKNOWLEDGE: With this option, a client acknowledges a message
by calling the message’s acknowledge method. Acknowledging a consumed
message automatically acknowledges the receipt of all messages that
have been delivered by its session.
So, the CLIENT_ACKNOWLEDGE option can NOT be used to send an acknowledgment to the JMS provider for a single message.
You can look at spec here:
http://download.oracle.com/otndocs/jcp/jms-2_0-fr-eval-spec/index.html