Annotate Conditional Field Attestation For Free

In this tutorial, we'll take a look at the @Conditional annotation. It's used to indicate whether a given component is eligible for registration based on a defined condition.

Annotation Interface Conditional Indicates that a component is only eligible for registration when all specified conditions match. A condition is any state that can be determined programmatically before the bean definition is due to be registered (see Condition for details).

It allows you to setup features based upon certain conditions like presence of a class in classparth or a JAR File which is how Spring Boot Auto-configuration works. The majority of @Conditional annotation users are, Conditions based on Bean definition or object present in the application.

@Bean is typically used in configuration classes that are annotated with @Configuration or @Import . @Component is typically used to mark classes as Spring-managed components that are picked up automatically by component scanning.

@Conditional vs @Profile The use of @Conditional and Condition is is similar to selecting different profiles using @Profile but is more flexible because the conditions are specified in Java code rather than using some pre defined property flag or some system property.

Difference between @Conditional and @Profile Annotations However, Spring 4 @Conditional is more generalized version of @Profile annotation. Spring 3.1 @Profiles is used to write conditional checking based on Environment variables only. Profiles can be used for loading application configuration based on environments.

In this tutorial, we'll take a look at the @Conditional annotation. It's used to indicate whether a given component is eligible for registration based on a defined condition.