What is meant by application-context in spring

application-context” in spring means nothing but it is core component of spring container in spring framework. Ideally we can say “application-context” one of the Spring Container in Spring Framework and other container is “bean-factory”. The configuration for “application-context” is loaded by the one of concrete implementation of ApplicationContext interface.

The ApplicationContext is the central interface within a Spring Application for providing configuration information to the application. It is read-only at run time , but can be reloaded if necessary and supported by the application.

Major Responsibilities of “application-context” container

  • It provides bean factory methods for accessing application components.
  • It provides the ability to load file resources in a generic fashion.
  • It provides the ability to publish event to register listeners
  • It provide the ability to resolve to support internationalization.

Creating one “application-context

  • AnnotationConfigApplicationContext. Loads a Spring application context from one or moro Java-Based configuration classes.
    ApplicationContext context = new AnnotationConfigApplicationContext(JavaConfig.class;
    
  • AnnotationConfigWebApplicationContext. Loads a Spring web application context from one or more Java-Based configuration classes.
    ApplicationContext context = new AnnotationConfigWebApplicationContext(JavaWebConfig.class;
    
  • ClassPathXMLApplicationContext. Loads a context definition from one or more XML files located in the classpath
    ApplicationContext context = new ClassPathXMLApplicationContext("spingConfig.xml");
    
  • FileSystemXMLApplicationContext. Loads a context definition from one or more XML files located in the filesystem.
    ApplicationContext context = new FileSystemXMLApplicationContext("c:/spingConfig.xml");
    
  • XMLWebApplicationContext. Loads a context definition from one or more XML files contained in the web application.
    ApplicationContext context = new XMLWebApplicationContext("/WEB-INF/config/spingConfig.xml");
    

Accessing Application Context in the other classes:
You could also access the “application-context” container into other classes. You can implement ApplicationContextAware as in the following example:

public class AnotherClass implements ApplicationContextAware {

    private ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }

}

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Dinesh Rajput

Dinesh Rajput is the chief editor of a website Dineshonjava, a technical blog dedicated to the Spring and Java technologies. It has a series of articles related to Java technologies. Dinesh has been a Spring enthusiast since 2008 and is a Pivotal Certified Spring Professional, an author of a book Spring 5 Design Pattern, and a blogger. He has more than 10 years of experience with different aspects of Spring and Java design and development. His core expertise lies in the latest version of Spring Framework, Spring Boot, Spring Security, creating REST APIs, Microservice Architecture, Reactive Pattern, Spring AOP, Design Patterns, Struts, Hibernate, Web Services, Spring Batch, Cassandra, MongoDB, and Web Application Design and Architecture. He is currently working as a technology manager at a leading product and web development company. He worked as a developer and tech lead at the Bennett, Coleman & Co. Ltd and was the first developer in his previous company, Paytm. Dinesh is passionate about the latest Java technologies and loves to write technical blogs related to it. He is a very active member of the Java and Spring community on different forums. When it comes to the Spring Framework and Java, Dinesh tops the list!

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