Spring boot - @ConditionalOnProperty or @ConditionalOnExpression

Question

I\'m using Spring-Boot-1.1.7. My intention is to add a bean to my context according to a value of a property of type string.

I mean, I can see a lot of examples of boole

Answer 1

If you are using e.g. a string value and want to check if a value is set, you can use a simple "check":

@Component
@ConditionalOnProperty(value = "foo.value")
public class Foo {
    private String value;
    // getter/ setter and other stuff ...
}

If you add: foo.value: bar to your application.yml file the component will be found and added to the application context, but if you do not set a value the component will not be added.

If you want to check if the component is found, you can use: debug: true in your application.yml.

Foo matched:
- @ConditionalOnProperty (foo.value) matched (OnPropertyCondition)

vs

Foo: Did not match:
- @ConditionalOnProperty (foo.value) did not find property 'foo.value' (OnPropertyCondition)