Spring Tutorials

Spring Tutorial

Introduction of Spring Framework

Advantages and Disadvantages of Spring Framework

Features of Spring Framework

Basic concept of Spring Framework

Architecture of Spring Framework

Modules of Spring Framework

Goal of Spring Framework

Create Application of Spring without any IDE

Create Application of Spring in Eclipse IDE

Create Application of Spring in MYEclipse IDE

Important JAR of Spring Framework

IOC container in Spring Framework

Bean and Applicationcontext container in Spring Framework

Example of Spring BeanFactory Container in Spring Framework

Example of Spring ApplicationContext Container in Spring Framework

Bean in Spring Framework

Lifecycle of Bean in Spring Framework

Scope of Bean in Spring Framework

Autowiring in Spring Framework

Dependency Injection in Spring Framework

Constructor-based Dependency Injection Example in Spring Framework

Setter-based Dependency Injection Example in Spring Framework

Introduction of AOP in Spring Framework

Core concept and Goal of AOP in Spring Framework

AOP Proxies in Spring framework

XML Schema Based AOP in Spring Framework

AOP Xml based Configuration Example in Spring Framework

Example of Declaring AOP Advices in Spring Framework

AOP AspectJ Annotation with Example in Spring Framework

Declaring an aspect and pointcut using Annotation in Spring Framework

Declaring AOP Advices using Annotation Example in Spring Framework

DAO support in Spring Framework

Introduction of Spring JDBC Framework in Spring Framework

Introduction of Spring JdbcTemplate in Spring Framework

Example of Spring JdbcTemplate class in Spring framework

Example of Executing SQL statements in Spring Framework

Example of Executing DDL statements in Spring Framework

SQL Stored Procedure in Spring Framework

Example of NamedParameterJdbcTemplate in Spring Framework

Example of RowMapperJdbcTemplate in Spring Framework

Introduction of ORM Framework in Spring Framework

Integration of Spring with Hibernate in Spring Framework

Integration of Spring with JPA in Spring Framework

Introduction of Spring Expression Language (SpEL) in Spring Framework

Example of Spring Expression Language (SpEL) in Spring framework

Example of Spring EL in XML and Annotation in Spring Framework

Language Reference with SpEL in Spring Framework

Operators in Spring Expression Language(SpEL) in Spring Framework

Variable in Spring Expression Language(SpEL) in Spring Framework

Introduction of Spring Framework Transaction Management in Spring Framework

Spring Framework Transaction Abstraction

Spring Declarative Transaction Management in Spring Framework

Spring Programmatic Transaction Management in Spring Framework

Introduction of Spring OXM (Object XML Mapping) in Spring Framework

Integration of Spring with Jaxb Example in Spring framework

Example of Spring with Xstream in Spring Framework

Example of Spring with Castor in Spring Framework

Remote Method Invocation(RMI) in Spring Framework

Spring and RMI Integration with Example in Spring Framework

Example of Spring and Httpinvoker in Spring Framework

Example of Spring and Hessian in Spring Framework

Integration of Spring with JMS in Spring Framework

Introduction of Webservice in Spring Framework

Spring Web Services in Spring Framework

Web Services with Jax-WS in Spring framework

Exposing and Exporting servlet-based Web Services using JAX-WS in Spring Framework

Accessing Web Services using JAX-WS in Spring Framework

Introduction of JMS in Spring Framework

JMS Messaging Models in Spring Framework

Using Spring JMS in Spring Framework

Sending and Receiving a Message Using JMS API in Spring Framework

Introduction of JMX (Java Management Extension) in Spring Framework

Integrating Beans with JMX in Spring Framework

Creating a MBeanServer in Spring Framework

Introduction Java Mail with Spring in Spring Framework

Example of Java Mail with spring in Spring Framework

Introduction of EJB(Enterprise JavaBeans) in Spring Framework

Introduction of EJB(Enterprise JavaBeans) Integration in Spring Framework

Integration of Spring With Struts 2 Example in Spring Framework

Spring MVC

Spring MVC

Dependency Injection in Spring
Previous Home Next

Dependency Injection (DI) is a design pattern that removes the dependency from the programming code so that it can be easy to manage and test the application. Dependency Injection makes our programming code loosely coupled.

Dependency injection (DI) is a process whereby objects define their dependencies, ie the other objects they work with, only through constructor arguments, arguments to a factory method, or properties that are set on the object instance after it is constructed or returned from a factory method. The container then injects those dependencies when it creates the bean.

This process is fundamentally the inverse, hence the name Inversion of Control (IOC), of the bean itself controlling the instantiation or location of its dependencies on its own by using direct construction of classes, or the Service Locator pattern.

The Dependency Injection is a design pattern that removes the dependency of the programs. In such case we provide the information from the external source such as XML file. It makes our code loosely coupled and easier for testing. In such case we write the code as:

Example

class Employee{
Address add;
Employee(Address add)
{
this.add=add;
}
public void setAddress(Address add)
 {
this.add=add;
 }
}

 

In this case, instance of Address class is provided by external souce such as XML file either by constructor or setter method.

Dependency Lookup

The Dependency Lookup is an approach where we get the resource after demand. There can be various ways to get the resource for example:

Employee emp = new EmployeeImpl();

Here we get the instance of Employee class directly by new keyword.

Employee emp = new Employee.getEmployee();

Here we get the resource or instance of Employee class by calling the static factory method getEmployee(). There can be various ways to get the resource define above and face some problems with Dependency Lookup.

  1. Tight coupling
  2. Hard testing
Types of Dependency Injection

There are Two ways to perform Dependency Injection in Spring framework as given below:

  1. By Constructor: Constructor-based DI is accomplished when the container invokes a class constructor with a number of arguments, each representing a dependency on other class.
  2. By Setter method: Setter-based DI is accomplished by the container calling setter methods on your beans after invoking a no-argument constructor or no-argument static factory method to instantiate your bean.

You can mix both, Constructor-based and Setter-based DI but it is a good rule of thumb to use constructor arguments for mandatory dependencies and setters for optional dependencies. Code is cleaner with the DI principle and decoupling is more effective when objects are provided with their dependencies.

The object does not look up its dependencies, and does not know the location or class of the dependencies rather everything is take care by the Spring Framework.

Previous Home Next

Tolal:0 Click:

Show All Comments

Did not find what you were looking for leave your name and message. We will revert within 24 hours
Name:
eMail:
Comment / Feedback: