Spring Boot @EnableAutoConfiguration exclude a class conditionally based on a property

Question

Is it possible to exclude a class from auto-configuration based on the value of a property? In my case I want to disable, MailSenderAutoConfiguration in some case. For example, say I have this property app.email.disabled=true in my application.properties, I would like something like this:

@SpringBootApplication
@EnableAutoConfiguration(exclude = MailSenderAutoConfiguration.class, ifProperty="app.email.disabled")
public class Application { .... }

I know I can declare a bean of type JavaMailSender and use @ConditionalOnProperty, but I already defined all email's properties in the application.properties and I don't want to repeat them again in a class.

Answer 1

I found a solution for my case, which is not the best solution but it works. In the MailSenderAutoConfiguration class there is this nested class :

**
 * Condition to trigger the creation of a {@link JavaMailSenderImpl}. This kicks in if
 * either the host or jndi name property is set.
 */
static class MailSenderCondition extends AnyNestedCondition {...}

So I just commented the spring.mail.host property and when I'll need to send emails I'll uncomment it. It isn't the best solution because I am sure I'll forget to uncomment it one day. This solution works in my case but for general needs (any auto-configuration) it will not work. I hope to see this feature on next Spring Boot version.