Spring Boot @ConditionalOnMissingClass Annotation Example
In this section we will learn about @ConditionalOnMissingClass Annotation. The @ConditionalOnMissingClass can be used to register a bean only when the given class(es) cannot be found on the class-path. For example, when providing library/framework classes to other developers, this annotation can be used to active certain beans only based on the absence of specific classes. The @ConditionalOnMissingClass annotation may be used on any class annotated with @Configuration , @Component , @Service & @Repository or on methods annotated with @Bean . 1. Using @ConditionalOnMissingClass on @Bean method To illustrate the use of @ConditionalOnMissingClass , we will create one simple service classe, SMSNotificationService class. public class SMSNotificationService { public SMSNotificationService() { System.out.println( "Inside SMSNotificationService Constructor" ); } public void sendSmsNotification() { System.out.println( "Sending S