A project needs to use the following combinaison of Jackson annotations together a lot. So, is there a way to create another annotation to avoid ugly copy/paste:
public class A {
@JsonProperty("_id")
@JsonSerialize(using=IdSerializer.class)
@JsonDeserialize(using=IdDeserializer.class)
String id;
}
public class B {
@JsonProperty("_id")
@JsonSerialize(using=IdSerializer.class)
@JsonDeserialize(using=IdDeserializer.class)
String id;
}
public class C {
@CustomId // don't repeat that configuration endlessly
String id;
}
Update: I've tried this, without success :-(
@Retention(RetentionPolicy.RUNTIME)
@JacksonAnnotationsInside
@JsonProperty("_id")
@JsonSerialize(using=IdSerializer.class, include=JsonSerialize.Inclusion.NON_NULL)
@JsonDeserialize(using=IdDeserializer.class)
public @interface Id {}
public class D {
@Id
private String id;
}
In this way, we can create different custom annotations for validation purposes. You can find the full source code here. It is easy to create and use custom annotations in Java. Java developers will be relieved of redundant code by using custom annotations.
To create your own Java Annotation you must use @interface Annotation_name, this will create a new Java Annotation for you. The @interface will describe the new annotation type declaration. After giving a name to your Annotation, you will need to create a block of statements inside which you may declare some variables.
The use of @JacksonAnnotationsInside
solve the problem:
public class JacksonTest {
@Retention(RetentionPolicy.RUNTIME)
@JacksonAnnotationsInside
@JsonProperty("_id")
@JsonSerialize(using=IdSerializer.class, include=Inclusion.NON_NULL)
@JsonDeserialize(using=IdDeserializer.class)
public @interface Id {
}
public static class Answer {
@Id
String id;
String name;
public Answer() {}
}
@Test
public void testInside() throws IOException {
ObjectMapper mapper = new ObjectMapper();
VisibilityChecker<?> checker = mapper.getSerializationConfig().getDefaultVisibilityChecker();
mapper.setVisibilityChecker(checker.withFieldVisibility(JsonAutoDetect.Visibility.ANY));
String string = "{ 'name' : 'John' , '_id' : { 'sub' : '47cc'}}".replace('\'', '"');
Answer answer = mapper.reader(Answer.class).readValue(string);
Assertions.assertThat(answer.id).isEqualTo("47cc");
}
}
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