Concept Overview Sometimes, it is necessary to inject a Collection of type java.util.Map into a bean using Spring injection. e.g. A TelephoneDirectory maps the name of a person with his telephone number. This is achieved by using the map tag within the property tag in Spring configuration. The following sample program provides an overview of … Read more

Concept Overview Sometimes, it is necessary to inject a Collection of type java.util.Set into a bean using Spring injection. e.g. A Team may contains a Set of Players. This is achieved by using the set tag within the property tag in Spring configuration. The following sample program provides an overview of injecting a Set of … Read more

Concept Overview Sometimes, it is necessary to inject a Collection of type java.util.List into a bean using Spring injection. e.g. A ToDoList may contains a list of tasks. This is achieved by using the list tag within the property tag in Spring configuration. The following sample program provides an overview of injecting a List of … Read more

Concept Overview It is possible to inject simple values like String, Integer, etc. into a bean. This is done using the value attribute of property tag in Spring configuration xml. The following sample program provides an overview of injecting simple values into a bean. Sample Program Overview In the sample program, we will create a … Read more

Concept Overview Normally, Spring instantiates a class and performs dependency injection. However, sometimes it may be necessary to instantiate a class via another class (usually called a Factory class). In such a scenario, Spring should not create the class on its own but simply delegate the instantiation to the Factory class. Spring provides a way … Read more

Concept Overview Sometimes, after Spring beans are created, they need to perform some additional initialization operations so that they can carry out their responsibilities. e.g. When an ATM (Automated Teller Machine) system is started, it needs to connect to its bank’s network. Similary, sometimes Spring beans need to peform some cleanup operations before it gets … Read more

Concept Overview Sometimes, after Spring beans are created, they need to perform some additional initialization operations so that they can carry out their responsibilities. e.g. When an ATM (Automated Teller Machine) system is started, it needs to connect to its bank’s network. Similary, sometimes Spring beans need to peform some cleanup operations before it gets … Read more

Concept Overview In typical software development, classes depend on each other to achieve a desired functionality. e.g. An Automatic Ticket Vending Machine class depends on Ticket class to achieve the functionality of generating tickets. The dependencies need to be ‘resolved’ before the desired functionality is can be achieved. When dependency resolution is not performed by … Read more

The Primary Spring bean scopes are Singleton and Prototype. In Singleton scope, the spring container instantiates only one instance of a bean per container. In Prototype scope, the container returns a new instance of a bean whenever we ask the container for that bean. Other bean scopes applicable only to web environments are request, session, … Read more

A bean defined within the context of another bean is called a spring inner bean. It is similar to the concept of inner classes in java. e.g. In an ATM (Automated Teller Machine) system, it is possible for the Printer bean to be defined as an inner bean of ATM class. Github – Source Code … Read more