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

Autowiring in Spring
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Autowiring feature of spring framework enables you to inject the object dependency implicitly. It internally uses setter or constructor injection. Spring framework is built on dependency injection and we inject the class dependencies through spring bean configuration file.

Usually we provide bean configuration details in the spring bean configuration file and we also specify the beans that will be injected in other beans using ref attribute. But Spring framework provides autowiring features too where we don’t need to provide bean injection details explicitly. Autowiring can't be used to inject primitive and string values. It works with reference only.

There are different ways through which we can autowire a spring bean.

  1. no- This is default setting which means no autowiring and you should use explicit bean reference for wiring. You have nothing to do special for this wiring.
  2. <bean id="employee" class="com.r4r.Employee">
    <property name="name" ref="name" />
    </bean>
    <bean id="name" class="com.r4r.Name" />>
    
  3. byName– For this type of autowiring, setter method is used for dependency injection. Also the variable name should be same in the class where we will inject the dependency and in the spring bean configuration file.
  4. <bean id="emloyeee" class="com.r4r.Emloyee" autowire="byName" />
    <bean id="name" class="com.r4r.Name" />
    
  5. byType– For this type of autowiring, class type is used. So there should be only one bean configured for this type in the spring bean configuration file.
  6.  

    <bean id="employee" class="com.r4r.Employee" autowire="byType" />
    <bean id="name" class="com.r4r.Name" />
    
  7. by constructor– This is almost similar to autowire byType, the only difference is that constructor is used to inject the dependency.
  8. <bean id="employee" class="com.r4r.Employee" autowire="constructor" />
    <bean id="name" class="com.r4r.Name" />
    
  9. by autodetect– If you are on Spring 3.0 or older versions, this is one of the autowire options available. This option was used for autowire by constructor or byType, as determined by Spring container. Since we already have so many options, this option is deprecated.
  10. <bean id="employee" class="com.r4r.Employee" autowire="autodetect" />
    <bean id="name" class="com.r4r.Name" />
    
  11. @Autowired annotation– We can use this annotation for spring bean autowiring. This annotation can be applied on variables and methods for autowiring byType. We can also use this annotation on constructor for constructor based autowiring.

    For this annotation to work, we also need to enable annotation based configuraiton in spring bean configuration file. This can be done by context:annotation-config element or by defining a bean of type org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.

  12. @Qualifier annotation– This annotation is used to avoid conflicts in bean mapping and we need to provide the bean name that will be used for autowiring. This way we can avoid issues where multiple beans are defined for same type. This annotation usually works with the @Autowired annotation. For constructors with multiple arguments, we can use this annotation with the argument names in the method.
Limitations of autowiring

Autowiring works best when it is used consistently across a project. If autowiring is not used in general, it might be confusing to developers to use it to wire only one or two bean definitions. Though, autowiring can significantly reduce the need to specify properties or constructor arguments but you should consider the limitations and disadvantages of autowiring before using them.

LimitationsDescription
Overriding possibilityYou can still specify dependencies using <constructor-arg> and <property> settings which will always override autowiring.
Primitive data typesYou cannot autowire so-called simple properties such as primitives, Strings, and Classes.
Confusing natureAutowiring is less exact than explicit wiring, so if possible prefer using explict wiring.
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