What is message driven Bean in EJB?
EJB – Message Driven Beans. 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. Message driven bean is a stateless bean and is used to do task asynchronously.
How to install mdbsample in JBoss With EJB?
Select JBoss 6.x as target run time and EJB 3.0 as EJB Version.Give suitable name to the project.In this case we are giving as MDBSample. Press Finish. 3)Now expand the project tree and create a new package in ejbModules .In this case , my package name is com.mdb.
How do clients invoke Message Driven Bean instances using JNDI?
Clients are not invoking Message Driven Bean instances by using JNDI.Instead clients can send JMS Messages to the corresponding queue or topic destinations. (Discussed in JMS Tutoria l).
How to create an EJB with EntityManager in Java?
Step 1 − Create table in database (Refer to EJB-Persistence chapter). Step 2 − Create Entity class corresponding to table (Refer to EJB-Persistence chapter). Step 3 − Create DataSource and Persistence Unit (Refer to EJB-Persistence chapter). Step 4 − Create a stateless EJB having EntityManager instance (Refer to EJB-Persistence chapter).
What are annotations in EJB?
In EJB 3.0, annotations are used to describe configuration meta-data in EJB classes. By this way, EJB 3.0 eliminates the need to describe configuration data in configuration XML files. EJB container uses compiler tool to generate required artifacts like interfaces, deployment descriptors by reading those annotations.
What is the use of beanname in EJB?
Used to specify or inject a dependency as EJB instance into another EJB. name − Used to specify name, which will be used to locate the referenced bean in the environment. beanInterface − Used to specify the interface type of the referenced bean. beanName − Used to provide name of the referenced bean.
Does the Conversational state annotation apply to all session beans?
This annotation applies only to stateful session beans. Because the EJB container automatically maintains the conversational state of a stateful session bean instance when it is passivated, you do not need to specify this annotation for most stateful session beans.