REST FUL GUIDELINE.

JERSEY URL GUIDE

JERSEY USER GUIDE URL.

https://jersey.java.net/documentation/latest/user-guide.html.

Today Thought's !!

Problems are Commons But Attitude makes Difference..

Spring MVC Flow Diagram

Spring MVC 3 Execution Flow

Step 1: First request will be received by DispatcherServlet
Step 2: DispatcherServlet will take the help of HandlerMapping and get to know theController class name associated with the given request
Step 3: So request transfer to the Controller, and then controller will process the request by executing appropriate methods and returns ModeAndView object (contains Model data and View name) back to the DispatcherServlet
Step 4: Now DispatcherServlet send the model object to the ViewResolver to get the actual view page
Step 5: Finally DispatcherServlet will pass the Model object to the View page to display the result.

DIFFERENCE BETWEEN LOAD() AND GET() METHOD IN HIBERNATE

1. session.load()
--------------------
It will always return a “proxy” (Hibernate term) without hitting the database. In Hibernate, proxy is an object with the given identifier value, its properties are not initialized yet, it just look like a temporary fake object.
If no row found , it will throws an ObjectNotFoundException.



2. session.get()
-------------------
It always hit the database and return the real object, an object that represent the database row, not proxy.
If no row found , it return null

Singleton java class Example

package com.singleton.pattern;

import java.io.Serializable;

public class SingletonDemo implements Cloneable, Serializable {
private static SingletonDemo instance;

/**
* Don't remove this constructor
*/
private SingletonDemo() {
// no-operation
System.out.println("SingletonDemo() created...");
}

public static SingletonDemo getInstance() {
// double-checking solution
if (instance == null) {
synchronized (SingletonDemo.class) {
System.out.println("locked..");
if (instance == null) {
instance = new SingletonDemo();
}
}
}
return instance;
}

@Override
public Object clone() throws CloneNotSupportedException {
throw new CloneNotSupportedException();
}

protected Object readResolve() {
return instance;
}

}

Java Interview Servlet Question

1.IN HOW MANY WAYS WE CAN DEVLOPE A SERVLET ?
2.WHAT IS THE DIFFERENCE BETWEEN ServletConfig & ServletContext ?
3.What are the Life Cycle Method of Servlet ?
4.Purpose of RequestDispatcher ?
5.Explain the purpose of Init() method & How many times it will be executed ?
6.Explain the difference between Get & Post method...