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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..
10.13 (CarbonFootprint Interface: Polymorphism) Using interfaces, as you learned in this chapter, you can specify similar behaviors for possibly disparate classes. Governments and
How memory allocated for a object
examples
A J2EE component is a self-contained functional software unit that is assembled into a J2EE application with its related files and classes and interacts with other components. The
Write a function that draws a cow at a certain location on the screen, and use the function to draw a herd of cows
Explain Data Updates issues in data management? DATA UPDATES: Old titles must be removed regularly Data changes every time Prices change Transportation / shipping cost change
Define the difference between StringBuffer and String class?
This language was designed to adapt the changing environment and behavior. New methods and instance variables can be added to the client side without any major changes happening at
Create a program Using Constructors? The further program uses the constructor to initialize a car rather than setting the areas directly. class CarTest7 { public static voi
Problem statement Part 1 Write an aspect that counts different kinds of method calls in a Java program. Your aspect should meet the following requirements: The aspect should ma
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