The difference is:
- LocalBean: This will run at the same EJB Container as its caller. This means every single call is faster compared to the remote call. But it will stay at the same servernode even if it runs out of ressources.
- RemoteBean: This will run at one Node in the EJB cluster. It will jump to another node, if one is running auf of ressources. ...
Full Answer
Can EJB components have remote and local interfaces?
Prefer Local Interfaces 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.
Why do we use pass-by-reference semantics in EJB?
In general, it is more efficient to use pass-by-reference semantics when possible. 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.
Should a bean have both a remote and local interface?
If, on the other hand, the bean is to be location-independent, then you should provide both the remote and local interfaces so that remote clients use the remote interface and local clients can use the local interface for efficiency. Using Pass-By-Reference Semantics
Why should I use the local interface instead of remote interface?
Thus, using the remote interface entails significant overhead. If an EJB component has a local interface, then local clients in the same application server instance can use it instead of the remote interface. Using the local interface is more efficient, since it does not require argument marshalling, transportation, and un-marshalling.
What is local and remote in EJB?
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 local interface in EJB?
The local interface is a standard Java interface. It does not inherit from RMI. An enterprise bean uses the local interface to expose its methods to other beans that reside within the same container.
How do I access EJB from remote client?
Steps for Accessing Any EJBIf 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.
What is remote EJB?
javax.ejb Declares the remote business interface(s) for a session bean. The Remote annotation is applied to the session bean class or remote business interface to designate a remote business interface of the bean.
What is remote interface?
In RMI, a remote interface is an interface that declares a set of methods that may be invoked from a remote Java virtual machine. A remote interface must satisfy the following requirements: A remote interface must at least extend, either directly or indirectly, the interface java.
What is @local annotation in EJB?
javax.ejb The Local annotation is applied to the session bean class or local business interface to designate a local interface of the bean. When used on the bean class, declares the local business interface(s) for a session bean. When used on an interface, designates that interface as a local business interface.
How do I call EJB from a client?
When you call a server-side EJB from a client application, you must use a network protocol that involves an ORB, such as RMI over IIOP. However, calling out from the servlet to an external object that is in the same session as the servlet can be much simpler and faster than calling from a client.
What are the different types of EJB?
There are three types of EJBs: session beans, entity beans, and message-driven beans.
How does EJB work internally?
The EJB container interacts directly with a message-driven bean—creating bean instances and passing JMS messages to those instances as necessary. The container creates bean instances at deployment time, adding and removing instances during operation based on message traffic.
How do I access EJB from standalone application?
To access an EJB component from a stand-alone clientIn your client code, instantiate the InitialContext: ... In the client code, look up the home object by specifying the JNDI name of the home object. ... Deploy the EJB component to be accessed.More items...
What are EJB objects?
ejb. EJBObject interface, and define the enterprise bean specific business methods. The enterprise bean's remote interface is defined by the enterprise bean provider and implemented by the enterprise bean container.
What is EJB client?
Another EJB. 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 EJBObject?
The EJBObject interface is extended by all enterprise beans' remote interfaces. An enterprise bean's remote interface provides the remote client view of an EJB object. An enterprise bean's remote interface defines the business methods callable by a remote client. The remote interface must extend the javax.
What is javax EJB stateless?
Advertisements. A stateless session bean is a type of enterprise bean, which is normally used to perform independent operations. A stateless session bean as per its name does not have any associated client state, but it may preserve its instance state.
What is CMP bean?
A container-managed persistence (CMP) bean is an entity bean for which the container handles the interactions between the enterprise bean and the data source. The container is responsible for synchronization of instance fields with the persistent store.
What is EJB application?
Based on the Enterprise JavaBeans (EJB) specification, enterprise beans are Java components that typically implement the business logic of Java 2 Platform, Enterprise Edition (J2EE) applications as well as access data.