[FIXED] how to enable spring filter on conditional annotation

Issue

I want to design such feature with SpringBoot. Say there are 2 projects 'projectA' and 'projectB', which B is a java library and A is depends on B. there is a Filter 'FilterA' defined on B ,

now I would like add a custom annotation @EnableCustomBean. Only if I put the @EnableCustomBean(class=FilterA.class), the FilterA will be work on projectA, I've search some about spring @Conditional , but still no idea

Solution

Option 1:

You don't need any custom annotations - just use @ConditionalOnProperty:

@Bean
@ConditionalOnProperty(prefix = "foo", name = "bar")
public YourFilterClass yourFilterClass() {
    ...
}

This bean will only be created if you define the foo.bar property

---

Option 2:

To satisfy your requirement of using custom Annotation you can:

1. define your own annotation

2. define custom condition:

   class MyCondition implements Condition {
       @Override
       public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
           return AnnotationUtils.getAnnotation(MainApplication.getClass(),YourCustomAnnotation.class) != null;
       }
   }
   

3. Use you custom condition with @Conditional over @Bean definition:

   @Bean
   @Conditional(MyCondition.class)
   public YourFilterClass yourFilterClass() {
       ...
   }
   

Answered By - J Asgarov
Answer Checked By - Katrina (JavaFixing Volunteer)