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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.
An introduction permits the user to add new methods or attributes to an existing class. This can then be explained to an existing class without having to change the structure of th
The == gives true, if the variable reference points to the similar types of object in memory. That is a " shallow comparison ". The equals () - gives the results of run
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What interface must an object implement before it can be written to a stream as an object? Ans) An object must execute the Serializable or Externalizable interface before i
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What do you mean by synchronization and its importance?
What is Invoking static methods If a method or field is declared static, you access it through using the class name rather than a reference to a particular example of the class
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