How to pass value to custom annotation in Java ?

Question

Below is my annotation: 

@Target(ElementType.METHOD)

@Retention(RetentionPolicy.RUNTIME)

public @interface CacheClear {

    long versionId() default 0;

}

I want to pass the method param "versionTo" to the custom annotation. Below is my code:

@CacheClear(versionId = {versionTo})

public int importByVersionId(Long versionTo){

    ......

} 

Can anyone tell me how to do it?

Answer 1

You can’t do it with custom annotations. You need constant values and a dynamic method parameter for annotations. 

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Answer 2

We can pass a custom annotation in java by setting the values and defining elements in the annotations by:

Define a custom annotation that includes elements as properties. Apply this annotation by assigning values to each element as needed. If necessary, use reflection to retrieve these values at runtime. This method allows data to be stored within annotations and accessed later in your Java application.