@Qualifier Annotation in spring

In this tutorial, we will see about @Qualifier Annotation in spring.

Tutorial Content: Spring tutorial for beginners

you can have more than one bean of same type in your XML configuration but you want to autowire only one of them ,so @Qualifier removes confusion created by @Autowired by declaring exactly which bean is to autowired.

@Qualifier Annotation in spring Example:

For configuring spring in your eclipse ide please refer hello world example

1.Country.java

This is simple pojo class having some attributes so here country has name and object of Capital class.
Create Country.java under package org.arpit.javapostsforlearning.Copy following content into Country.java.

2.Capital.java

This is also simple pojo class having one attribute called “capitalName”.

Create Capital.java under package org.arpit.javapostsforlearning.java.Above Country class contains object of this class.Copy following content into Capital.java

3.ApplicationContext.xml

As you can note here we are having two beans of same type.In Country.java we have used @Qualifier(“capitalA”) it means we want to autowire capital property of country with bean id=”capitalA” in XML configuration file.

4.QualifierAnnotationInSpringMain.java

This class contains main function.Create QualifierAnnotationInSpringMain.java under package org.arpit.javapostsforlearning.Copy following content into QualifierAnnotationInSpringMain.java

5.Run it

When you will run above application,you will get following as output.

That’s all about @Qualifier Annotation in spring.


import_contacts

You may also like:

Related Posts

  • 24 June

    No qualifying bean of type in Spring or Spring Boot

    Table of ContentsReason 1: You forgot to declare the bean itself.XML configurationJava configurationReason 2: You have not added package name to @ComponentScan. Reason 3: You have more than one candidate for autowiring In this post, we will see about an exception: No qualifying bean of type. Exceptions are least expected but you might get it […]

  • 17 June

    Spring XML configuration example

    Table of Contents1. Create a simple java maven project.2. Maven dependency3. Create Bean class4. ApplicationContext.xml5. Create SpringXMLConfigurationMain.java6. Run it In this post, we will see how to create Spring hello world XML based configuration example. Here are simple steps to create Spring XML configuration example. 1. Create a simple java maven project. 2. Maven dependency put […]

  • 15 June

    Injecting Prototype bean into a Singleton bean in Spring

    Table of ContentsProblemSolutionUsing Method injectionUsing ObjectFactoryUsing ApplicationContextAware In this post, we will see how to inject prototype bean scope into Singleton Instance in Spring. This is one of the most asked Spring interview questions. Problem When you inject prototype bean to singleton bean, prototype bean still behave like a singleton bean. Let’s understand this with […]

  • 15 June

    Circular dependencies in Spring

    Table of ContentsProblemSolutionRedesignSetter [email protected] with @Autowired [email protected] with @Autowired annotation In this post, we will discuss one of the most asked Spring interview questions. What happens if there are circular dependencies in Spring. Problem What if there are circular dependencies in Spring? For example: Class A requires an instance of Class B and Class B […]

  • 12 September

    Spring init-method and destroy-method example

    In this post, we will see about Spring init-method and destroy-method. When bean is instantiated or destroyed , there are some operations you may need to perform, so you can use init-method and destroy-method to call this methods while bean is being created or destroyed. Lets understand it with the help of simple example: For […]

  • 27 July

    Prefix “context” for element “context:component-scan” or “context:annotation-config” is not bound : Spring error

    When you are working on spring or spring mvc application, you may encounter below error message. org.xml.sax.SAXParseException: The prefix “context” for element “context:component-scan” is not bound . or org.xml.sax.SAXParseException: The prefix “context” for element “context:annotation-config” is not bound . This issue generally occurs when you do not include context namespace. For example: Lets say you have below […]

Leave a Reply

Your email address will not be published. Required fields are marked *

Subscribe to our newletter

Get quality tutorials to your inbox. Subscribe now.