- MDB class must directly (using implements keyword) or indirectly (using annotation or descriptors) implement a message listener interface. Example,
- Using implements keyword
- Using annotation
- It is a POJO class and marked with @MessageDriven annotation
- The MDB class must be declared
The container can pool MDB instances in the same way as it does for stateless session beans. As soon as a new message reaches the destination, an MDB instance is retrieved from the pool to handle the message. Once the Read more…
Lifecycle callback methods
The following lifecycle event callbacks are supported for message-driven beans.
PostConstruct
- The PostConstruct callback occurs after the container creates a new instance of MDB and before the first message listener method invocation on the bean. This is
To a client, a message-driven bean is a message consumer that implements some business logic running on the server.
The most visible difference between message-driven beans and session beans is that clients do not access message-driven beans through interfaces. Read more…
Message Driven Bean
A message-driven bean (MDB) is an enterprise bean that allows Java EE applications to process messages asynchronously. In other words, an MDB is an asynchronous message consumer.
A message-driven bean is invoked by the container Read more…
JMS Programming Model
ConnectionFactory
- an administered object that encapsulates a set of connection configuration parameters.
- A client uses it to create a Connection to a JMS provider.
- JMS clients find administered objects by looking them up in a JNDI namespace.
JMS API
The Java Message Service is a Java API that allows applications to create, send, receive, and read messages.
The JMS API defines a common set of interfaces and associated semantics that allow programs written in the Java programming Read more…
Messaging Concepts Introduction
Messaging is a method of communication between software components or applications.
- A messaging system is a peer-to-peer facility
- A messaging client can send messages to, and receive messages from, any other client.
- Each client connects to a
Environment Used
- JDK 6 (Java SE 6)
- EJB 3.x Stateful Session Bean
- Eclipse Indigo IDE for Java EE Developers (3.7.1)
- JBoss Tools – Core 3.3.0 M5 for Eclipse Indigo (3.7.1)
- JBoss Application Server (AS) 7.1.0 Final
Setting up development environment: Read more…
Environment Used
- JDK 6 (Java SE 6)
- EJB 3.x Stateless Session Bean
- Eclipse Indigo IDE for Java EE Developers (3.7.1)
- JBoss Tools – Core 3.3.0 M5 for Eclipse Indigo (3.7.1)
- JBoss Application Server (AS) 7.1.0 Final
Setting up development environment: Read more…