Uploaded by. You are on page 1of 48 Search inside document 1. What is EJB? It enables rapid development of ission-critical application that are versatile, reusable and portable across middleware while protecting IT investment and preventing vendor lock-in.
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Sabar What is difference between HashMap and Hashtable i What is Service locator ejb3 interview questions and answers pattern? This gives the double bonus of speeding up the initial load time for the application, as not quextions plug-ins are loaded straightaway; ensuring efficiency as only the plug-ins that are used are loaded at all. NEVER — Indicates if business method executes as part of transaction then an exception will be thrown.
It is less resource intensive as compared to entity beans. Class level interceptor can be applied both by annotation or via xml ejb-jar. An ejbSelect method can be called by a business method, ejbLoad or ejbStore method. Following is the list of callback annotations for stateful bean: When Client calls the bean instance again then Container takes the passivated bean from secondary storage and puts it in memory to serve ejb3 interview questions and answers client request.
The codes are written using the components that are pre-defined and allow easy way for the user to implement it. Stateless Session Bean 1. How Generics in Java w Incase you choose to write persistence within your session bean, its usefull to note that the persistence is managed by the container BMP.
It is good to be serializable. Use the Java questuons with ControlExtension that resides in the following library: Success meant all items executes successfully. How HashMap works ejb3 interview questions and answers Java? Java beans are reusable components that can be used for customized user objects It can be stateful or stateless.
Failed — Identify failure scenario when a transaction is to be rollback. It gives transaction processing, concurrency control and other services like security, remote procedure call, etc. This consists of all the enterprise bean instances that are distributed and running in a separate java virtual machines. Explain with an example Stateful session beans. Can be applied at class as well as at method level.
It is helpful in two kinds of finder ejb3 interview questions and answers Newer Post Older Post Home. Generate new Copy the numbers and letters from the security image. Share to Twitter Share to Facebook. PrePassivate — method is invoked when a bean is put back to bean pool. This ensures that transacitons are not lost even if the system crashes. During runtime, when the changes made in the various properties of server group, are propagated in every associated clone, this process is known as Ripple Effect.
What are the different types of enterprise beans exist? How to design a vending machine in Java? The beans are of no use outside the EJB container as the purpose of ejb3 interview questions and answers EJB container is to provide the services like transaction, security, etc. In other words, if one enterprise bean is always associated with another, it is perfectly appropriate to co-locate them i. Transaction context is unspecified. Any of these pooled instances may be ejb3 interview questions and answers to execute finder ejbFind or home ejbHome methods.
It allows the server to pass the test and brand themselves. Message s can be consumed and processed concurrently by using multiple instances of the same type. On checkout the ejb3 interview questions and answers is disposed. Session beans, which usually contains workflow or business logic should never have persistence code. Implementation of available methods in the interface of context such as a context called javax.
The example is used of price list that is global everywhere and need to be updated all the time. For examples, a book can have mutiple authors and a author can write multiple books. Related Articles
EJB3 INTERVIEW QUESTIONS AND ANSWERS PDF
Vulrajas PreUpdate — method is invoked before an entity is to be updated in the database. The container create the instance of session bean and call setSessionContext and ejbCreate method. This consists of the EJB server model, container and its component with pre-defined roles that is given to the bean quetsions model. What are the categories used to contain one or more restricted components?
EJB3 INTERVIEW QUESTIONS AND ANSWERS DOWNLOAD
Sabar What is difference between HashMap and Hashtable i What is Service locator ejb3 interview questions and answers pattern? This gives the double bonus of speeding up the initial load time for the application, as not quextions plug-ins are loaded straightaway; ensuring efficiency as only the plug-ins that are used are loaded at all. NEVER — Indicates if business method executes as part of transaction then an exception will be thrown. It is less resource intensive as compared to entity beans.