Take 6 beans as singleton scope beans and 4 beans as prototype scope beans and don't make prototype scope beans as dependent to singleton scope beans. and also make sure that lazy-init="true" is not placed in singleton scope Beans configuration.
hence we know that IOC conatiner creates bean class object for every factory.getBean(-,-) method call.so even though object is created through pre-instantiation process that will be wasted because it has to create new object when factory.getBean(-,-) method call.
Lazy Initiation in Spring IOC
As we know Spring’s bean factory is pre-initiate all the beans when first time creating the factory. This is good practice because if there is any dependency error everything can be resolved at the time of start up.
we can make our ApplicationContext container not to perform pre-instantiation of singleton Spring Bean by keeping lazy-init="true" in bean tag.
we can understand it by following example:
Employee.java
package com.ch.ioc;
public class Employee {
private
String name;
private Address
address;
public
Employee() {
System.out.println("Employee Constructor");
}
public Address
getAddress() {
return address;
}
public void
setAddress(Address address) {
this.address
= address;
}
public
String getName() {
return name;
}
public void
setName(String name) {
this.name = name;
}
}
Address.java
package com.ch.ioc;
public class Address {
public
Address() {
System.out.println("Address Constructor");
}
private
String city;
private
String pincode;
public
String getCity() {
return city;
}
public void
setCity(String city) {
this.city = city;
}
public
String getPincode() {
return pincode;
}
public void
setPincode(String pincode) {
this.pincode = pincode;
}
}
LazyInit.java
package com.ch.ioc;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class LazyInit {
public static void main(String args[]) {
//Initializing context
ApplicationContext
applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
System.out.println("After initialization");
applicationContext.getBean("addressBean");
}
}
ApplicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.5.xsd http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-2.5.xsd http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">
</beans>
