Java EE 8 Design Patterns and Best Practices

Qualifier to select the JpgHandler observer to react to an event 

In the following code, we have the Jpg qualifier, used to define the correct handler:

import javax.inject.Qualifier;import java.lang.annotation.ElementType;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target;@Qualifier@Retention(RetentionPolicy.RUNTIME)@Target({ElementType.METHOD, ElementType.TYPE, ElementType.PARAMETER, ElementType.FIELD})public @interface Jpg {}