Skip to main content

Spring - The purpose of parent attribute.

 The "parent" element of <bean> tag is used for reusing configuration parameters. This "parent" attribute accepts a reference to an another bean of same type. All the parameters that are configured in parent bean are also available in child bean. See the below example.
 In this example I have configured two beans in beans.xml file namely bean1 and bean2. The bean2 have an parent attribute value as "bean1", In this situation the bean2 inherits the all the properties and values of the bean1 (name1, name2, name3, name4 - properties and values). 
 If you want to override the some of the property of bean1 then you have to redefine the same properties into child bean. Here the properties name3 and name4 are override-ed by child bean (bean2). 
Labels:

Comments

Post a Comment

Popular posts from this blog

Getting key/value pair from JSON object and getting variable name and value from JavaScript object.

 Hi, I had faced one issue like this. I have an JSON object but I don't know any key name but I need to get the all the key and corresponding value from JSON object using client side JavaScript. Suddenly I wondered whether it's possible or not, after that I had done lot of workaround and finally got this solution. See the below example.    function getKeyValueFromJSON() {     var jsonObj =  {a:10,b:20,c:30,d:50} ;     for ( var key in jsonObj) {       alert( "Key: " + key + " value: " + jsonObj[key]);     }  }  In this example I have created the one json array as string, and converted this string into JSON object using eval() function. Using for-each loop I got all the key value from jsonObj, and finally using that key I got the corresponding value.  Finally I got the alert like this,    Key: a value:10    Key: b value:20    Key: c value:30    Key: d value:50  During this workaround I got one more idea, using this same way I got
35 comments
Read more

Simple Login Application Using Spring MVC and Hibernate – Part 1

 I hope developers working in web application development might hear about MVC architecture. Almost all technologies provide support for MVC based web application development, but the success is based on many factors like reusable of the code, maintenance of the code, future adaption of the code, etc..,  The success of the Spring MVC is “ Open for extension and closed for modification ” principle. Using Spring MVC the developers can easily develop MVC based web application. We don’t need any steep learning curve at the same time we need to know the basics of spring framework and MVC architecture. The Spring MVC consists of following important components. 1. Dispatcher servlet 2. Controller 3. View Resolver 4. Model Spring MVC - Overview  The overall architecture of Spring MVC is shown here.  1. When “Dispatcher Servlet” gets any request from client, it finds the corresponding mapped controller for the request and just dispatches the request to the corresponding contro
52 comments
Read more

Spring - ArrayList configuration using xml bean configuration file

In this example I am going to give example for array list configuration in spring application using XML bean configuration file. This is my bean, here I have created the setter and getter method for array list variable ("countryList").    import java.util.ArrayList;   public class ArrayListConfig {       private ArrayList<String> countryList ;       public ArrayList<String> getCountryList() {             return countryList ;       }       public void setCountryList(ArrayList<String> countryList ) {             this . countryList = countryList ;       }        } This is my beans.xml file. The <list> tag is used for configuring list.       <? xml version = "1.0" encoding = "UTF-8" ?>  < beans xmlns = "http://www.springframework.org/schema/beans"       xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"       xsi:schemaLocation = "http://www.spri
1 comment
Read more