Which is method for message driven beans?

The onMessage method can call helper methods or can invoke a session bean to process the information in the message or to store it in a database. A message can be delivered to a message-driven bean within a transaction context, so all operations within the onMessage method are part of a single transaction.

What makes message beans different from session beans?

The most visible difference between message-driven beans and session beans is that clients do not access message-driven beans through interfaces. In several respects, a message-driven bean resembles a stateless session bean. A message-driven bean’s instances retain no data or conversational state for a specific client.

Which of the following is a feature of message-driven bean?

These are the key features of message-driven beans: A message-driven bean’s instances retain no data or conversational state for a specific client. All instances of a message-driven bean are equivalent, allowing the EJB container to assign a message to any message-driven bean instance.

Which interface should be implemented when creating a message-driven bean?

All message-driven beans must implement the MessageDrivenBean interface. For JMS messaging, a message-driven bean must also implement the message listener interface javax. jms. MessageListener.

What’s the difference between Tomcat and GlassFish web server?

Furthermore, in addition to being a Java EE application server, GlassFish handles EJB requests thus is also an EJB Container. Also, essentially it has its own web container (a derivative of Tomcat) and thus shares the same Catalina servlet container with Tomcat. Host any Java Web Framework listed here and much more!

How to create a message driven Bean in GlassFish?

The mdb-connection-factoryelement in the glassfish-ejb-jar.xmlfile for a message-driven bean specifies the connection factory that creates the container connection to the JMS provider.

Which is an example of a message driven Bean?

As a result, this event triggers the code inside this bean. We can perform a lot of tasks inside an MDB onMessage () method, since showing the received data on a browser or parsing and saving it to a database. Another example is submitting data to another queue after some processing. It all comes down to our business rules.

When is a message driven Bean invoked in EJB?

A message driven bean is a type of enterprise bean, which is invoked by EJB container when it receives a message from queue or topic.