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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..
When multiple threads working, Synchronization is to lock a method for a certain object.
Does Java pass arguments by value or reference? Ans) Pass by value. 1. When passing primitives, it going a copy of the variable to the method. Any change made in the method d
EJB 2.x is broadly adopted server side component architecture for J2EE. 1. EJB is a remote, distributed multi-tier system and allows protocols like IIOP, JRMP, and HTTP etc.
Why is an Interface be able to extend more than one Interface but a Class can't extend more than one Class? Basically Java doesn't permit multiple inheritances, so a Class is r
Create a compressed file that contains the eclipse project directory and a short document that describes: the methods implemented any missing or incomplete elements o
The class TurtleQTwo extends Turtle by adding one new method, plus, which is specified below. (All other features of TurtleQTwo are the same as for Turtle.) method plus(n in
Explain Multiple Initializers and Incrementers ? Sometimes it's essential to initialize several variables before starting a for loop. Similarly you may need to increment more t
java code for finding area under curve y=f(x) between x=a and a=b integrate y=f(x) between the li,its of a and b. the area under a curve between two points can be found by doing a
What is the difference between instance and object of a class? Few says both are same, then why java kept both the words for same thing?
Component classes generally move the task of generating output to the renderer. All JSF components follow it. Render kit is a set of related renderers. javax.faces.render.RenderKit
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