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Procedure documentationConfiguring Methods Using Annotations in Web Applications Locate this document in the navigation structure

 

You can define the moment when a method is called by using the corresponding annotations.

There are two annotations for configuring method invocation:

  • @PostConstruct

    This annotation specifies that the method will be called before all lifecycle methods are called.

  • @PreDestroy

    This annotation specifies that the method will be called before the servlet object is destroyed.

Procedure

Using the @PostConstruct Annotation

Use this annotation at method level without any attributes.

Example Example

  1. public class PostConstructAnnot_servlet extends HttpServlet {

//…

	@PostConstruct
	public void postConstruct() {
		//Invocation of init methods, preparative operations
		System.out.println("PostConstructAnnot_servlet: "
				+ " postConstruct method invoked! ");
	}

//…

}
End of the code.
Using the @PreDestroy Annotation

Use this annotation at method level without any attributes.

Example Example

  1. public class PreDestroyAnnot_servlet extends HttpServlet {

//…

@PreDestroy
    public void preDestroy(){
         //Clean up any open resources
    	     System.out.println("PreDestroyAnnot_servlet: " +
 		                " preDestoy method invoked! "); 
    }

//…
End of the code.