ConditionalOnExpression Type — spring-boot Architecture

Source Code

core/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/ConditionalOnExpression.java lines 39–52

@Retention(RetentionPolicy.RUNTIME)
@Target({ ElementType.TYPE, ElementType.METHOD })
@Documented
@Conditional(OnExpressionCondition.class)
public @interface ConditionalOnExpression {

	/**
	 * The SpEL expression to evaluate. Expression should return {@code true} if the
	 * condition passes or {@code false} if it fails.
	 * @return the SpEL expression
	 */
	String value() default "true";

}