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Java has two kinds of exceptions:
1. Checked exception: handled from java.lang.Exception but not java.lang.RuntimeException.
2. Unchecked exception: handled from java.lang.RuntimeException thrown by JVM.
EJB has two kinds of exceptions:
1. System Exception : is an unchecked exception produced from java.lang.RuntimeException. An EJBException is an unchecked exception, which is started from java.lang.RuntimeException.
2. Application Exception : is generic to an application and thrown because of violation of business rules. An Application Exception is a checked exception that is either described by the bean developer and does not import java.rmi.RemoteException.
A System Exception is given by the system and is not recoverable. Because the System Exceptions are unpredictable when they occur, the EJB container is the only one responsible for trapping the System Exceptions. The container usually wraps any RuntimeException in RemoteException, which subsequently puts thrown to the caller. In addition to intercepting System Exception the container can give the errors.
The Spring container is able to autowire relationships among collaborating beans. This means that it is possible to automatically let Spring resolve collaborators (other beans) for
Point-To-Point (PTP). This model permits exchanging messages via queues formed for some purposes. A client can send and receive messages from one or various queues. PTP model is ea
Determine the types of object oriented programme Classes - Prototypes for objects - Definition or a blueprint of a user-defined datatype - Think of it as a ma
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Explain the library java.lang.Math ? The Java class library is huge. We will not cover it all presently. In fact, the remaining eight classes will focus mostly on the class lib
calculate the size of the tract of land by the size of an acre to get the number of acres.
program code
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Object-to-Relational (O/R) mapping : There are various ways to persist data and the persistence layer is one of the most important layers in any application development. O/R ma
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