What is meant by remote client view of a Java Bean?
A remote client of an enterprise bean has the following traits. It can run on a different machine and a different JVM from the enterprise bean it accesses. (It is not required to run on a different JVM.) It can be a web component, an application client, or another enterprise bean.
What is a no-interface view?
A no-interface view of an enterprise bean exposes the public methods of the enterprise bean implementation class to clients. Clients using the no-interface view of an enterprise bean may invoke any public methods in the enterprise bean implementation class or any superclasses of the implementation class.
How do I access EJB from remote client?
Steps for Accessing Any EJB
- If you are remote, download the oc4j. jar file.
- Set up JNDI properties for the connection, if necessary.
- Determine which InitialContextFactory you will use for the connection.
- Retrieve an EJB using either the JNDI name or an EJB reference, which is configured in the deployment descriptor.
How does EJB determine remote or local access?
Whether to allow local or remote access depends on the following factors.
- Tight or loose coupling of related beans: Tightly coupled beans depend on one another.
- Type of client: If an enterprise bean is accessed by application clients, it should allow remote access.
What is the purpose of message Driven Bean?
The purpose of an MDB is to exist within a pool and to receive and process incoming messages from a message provider. The container invokes a bean from the queue to handle each incoming message from the queue.
What is a stateless session bean?
“Stateless session beans are session beans whose instances have no conversational state. This means that all bean instances are equivalent when they are not involved in servicing a client-invoked method. The term ‘stateless’ signifies that an instance has no state for a specific client.”
What is remote interface in EJB?
An EJB component can have remote and local interfaces. Clients not located in the same application server instance as the bean (remote clients) use the remote interface to access the bean. If a bean is to be used only by local clients then it makes sense to provide only the local interface.
What is a no interface view in EJB?
The new No-Interface Local View enables the customer to use the Enterprise JavaBeans (EJB) class as the local interface. This is supported when: The bean does not expose any other client views (Local, Remote, 2. x Remote Home, 2. x Local Home, Web Service) and its implements clause is empty.
How does EJB lookup work?
The actual lookup is performed by the nested class EJBFactory, which first creates a JNDI InitialContext instance, then passes the required JNDI parameters to the constructor, and finally uses it for looking up the bean proxy. Notice that the lookup is performed by using WildFly’s proprietary “ejb:” namespace.
What is EJB client?
Runs in the same or a different WebSphere Application Server as the EJB. For example, the employer bean and employee bean provided with the VSE Connector Client example, act as EJB clients when they access the record bean. In other words, an EJB client is any Java program that accesses an EJB.
What is the difference between a local and remote interface?
Using the remote and local interfaces appropriately means that clients can access EJB components efficiently. That is, local clients use the local interface with pass-by-reference semantics, while remote clients use the remote interface with pass-by-value semantics.
What is remote EJB?
A remote EJB is one that is accessed through his remote interface. All his parameters is transmitted by value and not by reference even if caller and EJB reside both in the same JVM.