Jackson custom annotations. Create alternate serialization of the object maintaining the original serialization intact.

Check.java

package jackson;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectWriter;

public class Check {
  public static void main(String[] args) throws Exception {
    Person person = new Person("George G. Shelton", "4444555566667890", "010199-111T");
    System.out.println("To String = " + person);

    ObjectWriter jsonWriter = new ObjectMapper().writer();
    System.out.println("Regular json serialize = " + jsonWriter.writeValueAsString(person));

    ObjectWriter customWriter = new ObjectMapper().setAnnotationIntrospector(new CustomAnnotationIntrospector()).writer();
    System.out.println("Custom annotation json serialize = " + customWriter.writeValueAsString(person));
  }
}

CreditCardObfuscator.java

package jackson;

import com.fasterxml.jackson.databind.util.StdConverter;
import org.apache.commons.lang.StringUtils;

public class CreditCardObfuscator extends StdConverter<String, String> {

  @Override
  public String convert(String value) {
    if (StringUtils.isBlank(value)) {
      return value;
    }
    return StringUtils.repeat("*", 12) + value.substring(12);
  }
}

CustomAnnotationIntrospector.java

package jackson;

import com.fasterxml.jackson.databind.introspect.Annotated;
import com.fasterxml.jackson.databind.introspect.AnnotatedMember;
import com.fasterxml.jackson.databind.introspect.JacksonAnnotationIntrospector;

public class CustomAnnotationIntrospector extends JacksonAnnotationIntrospector {

  @Override
  public boolean hasIgnoreMarker(AnnotatedMember m) {
    if (m.hasAnnotation(HideValue.class)) {
      return true;
    }
    return super.hasIgnoreMarker(m);
  }

  @Override
  public Object findSerializationConverter(Annotated a) {
    if (a.hasAnnotation(ObfuscateValue.class)) {
      return a.getAnnotation(ObfuscateValue.class).value();
    }
    return super.findSerializationConverter(a);
  }
}

HideValue.java

package jackson;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target({ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface HideValue {
}

ObfuscateValue.java

package jackson;

import com.fasterxml.jackson.databind.util.StdConverter;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target({ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface ObfuscateValue {

  Class<? extends StdConverter> value();
}

Person.java

package jackson;

import lombok.AllArgsConstructor;
import lombok.Data;

@Data
@AllArgsConstructor
public class Person {

  private String name;

  @ObfuscateValue(CreditCardObfuscator.class)
  private String creditCardNumber;

  @HideValue
  private String ssn;
}

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>io.cm</groupId>
  <artifactId>jackson-custom-serialize</artifactId>
  <version>1.0-SNAPSHOT</version>

  <dependencies>
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.16.20</version>
      <optional>true</optional>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.9.5</version>
    </dependency>
    <dependency>
      <groupId>commons-lang</groupId>
      <artifactId>commons-lang</artifactId>
      <version>2.6</version>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.7.0</version>
        <configuration>
          <source>${java.version}</source>
          <target>${java.version}</target>
          <showDeprecation>true</showDeprecation>
          <showWarnings>true</showWarnings>
          <compilerArgument>-Xlint:all</compilerArgument>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>