Spring Autowiring constructor Example

In this article lets take a look into Autowiring by constructor, This type of Autowiring is similar to Autowiring byType , but type applies to constructor arguments. Spring framework tries to match the arguments of the Constructor to the bean type in the configuration file, If a bean is found then Spring injects the object. If not found then it will throw exception.
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Spring Autowiring byType Example

In this article lets take a look into Autowiring byType, This type of Autowiring in Spring the Spring framework injects dependency based on type(class). Unlike Autowiring byName bean id and property name can be different. It tries to match the property type to the bean type in the configuration file, If a bean is found then Spring internally uses Setter Injection and the object will be injected. If not found then it will throw exception.
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Spring Autowiring byName Example

We all know what is Autowiring in Spring,now lets take a look into Autowiring byName in this article. In this type of autowiring, Spring framework finds out a bean in the configuration file, whose bean id is matching with the property name.  If a bean is found with the bean id as the property name in the configuration file then Spring internally uses Setter Injection and the object will be injected. If no id is found then that property remains un-wired and never throws any exception.
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Autowiring in Spring

We have already learnt how to declare Spring beans and inject bean using <property> (Setter Injection) and <constructor-arg> (Constructor Injection) in the XML configuration file.

Autowiring is a feature of Spring framework which lets you to Inject Dependency implicitly. Basically it will be using internally using Setter Injection / Constructor Injection.

Point to be noted here is Autowiring can’t be used to inject primitive and string values. It works only with objects. [Read more…]