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The clustering regulates high scalability and availability. The basic considerations for servlet clustering are:
1. Objects opened in a session could be serializable to support in-memory replication of sessions. Also consider the problem of serializing very big objects. Test the performance to make sure it is running.
2. Design for idempotence. Failure of an impatient or a request users clicking again may result in duplicate requests being given. So the Servlets could be relay to tolerate duplicate requests.
3. Avoid using static and instance variables in write and read mode because different instances can exist on different JVMs or on different operating system. Any state could be held in an external instance such as a database.
4. Avoid sending values in a ServletContext. It is not serializable and also the different resources may exist in different JVMs.
5. Avoid using java.io.* because the files cannot exist on all backend machines #question..
EJBs are distributed elements, which need the RMI framework for object distribution. An EJB application server gives more services like object pooling, transaction management, data
How Trojan Horses or Worms affect a computer system? What guidelines should be adopted to troubleshoot along with malicious software? Trojan horses are stand-alone programs. Th
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Why Local variable is preferred over Global variable ? In my point of view Global variable has a few advantage along with Local variables is preferred because of the subsequent
Tasks: Complete the specification of CHATTER, and specify ChatterLists. Implement these ADTs in Java with an abstract class Chatter and a class ChatterList. Use javado
Write a Java program in a NetBeans project that reads a text file containing the names and addresses of several people and displays them all at once or one at a time upon selecting
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Differentiate between Primitives and Objects Everything in Java is an "Object", as every class by default inherits from class "Object", except a few primitive data t
Problem description: A travelling salesman wants to make a tour of the cities and returns back to the starting point. What is the minimum length tour? Formal Definiti
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