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Bean getting initialised everytime, why ?

Rahul Shivsharan
Ranch Hand

Joined: Jun 17, 2009
Posts: 83

Emplyee interface


PermanentEmpl.java ,



ContractEmpl.java,



Car.java,


SUV.java,


ManagerSer.java,


bean-config-Two.xml,


MainPractise15.java,


now when i run MainPractise15.java, the commandline output is


now if i add attribute as follows


and if i run the main class MainPractise15.java, the output is


Now my question is why ManagerSer is initialized 3 times in first scenario and 2 times in second scenario ?
Mark Spritzler
ranger
Sheriff

Joined: Feb 05, 2001
Posts: 17249
    
    6

You have three beans of that type. You are also using Bean Definition inheritence in your configuration. In the first example, the parent <bean> tag get a bean instantiated as well as the other two. In your second version for the parent bean you used the attribute abstract="true", which tells Spring not to instantiate that bean, but just use the bean configuration for the other two. This is the same as creating a parent Java class as abstract or not.

public abstract class Car

public class Honda extends Car

public class Toyota extends Car

in that hierarchy I can only instantiate Honda and Toyota, not Car because it is abstract. It works the same way with <bean> tags if you have <bean abstract="true"> then Spring can't instantiate that bean.

Mark


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