Dealing with parameterized constructor in spring

1.   Class Tester :  

package samples.experiment;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Tester {
public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext("Dispatcher-servlet.xml");
        PrintString s=(PrintString)context.getBean("stringPrinter",new Object[]{"Sanjeevan"});
        s.printString();
}

}

=======================================

2.   Class PrintString :  

package samples.experiment;

public class PrintString {

private String s;

PrintString() {

System.out.println("Default consrtructor invoked");

}

PrintString(String s) {

this.s=s;

System.out.println("Input got in constructor is : " + s);

}

}

=======================================

3. Dispatcher-servlet.xml

<bean id="stringPrinter" class="samples.experiment.PrintString" scope="prototype"/>

=======================================

OUTPUT

Input got in constructor is : Sanjeevan

Entered the string method os PrintSring class : Sanjeevan

Error:

When you are not using scope="protype" in 

<bean id="stringPrinter" class="samples.experiment.PrintString"/>, 

then you will be getting the error as follows.

org.springframework.beans.factory.BeanDefinitionStoreException: Can only specify arguments for the getBean method when referring to a prototype bean definition

This is because , by default the scope is singleton and so spring will try to create object even before the first request for the object, where it cant get the constructor parameter from user.