Customize Jackson ObjectMapper to Read custom Annotation and mask fields annotated

[Saurabh Bhardwaj]

I have a requirement where I have created a Custom Annotation @MaskSensitiveData. I annotate sensitive fields. like

class MyBean {
    String userName;
    @MaskSensitiveData
    String cardNumber;
    String abc;
    String xyz;
}

ObjectMapper mapper = new ObjectMapper();
    String json = null;
    AnnotationIntrospector primary = new JaxbAnnotationIntrospector();
    AnnotationIntrospector secondary = new JacksonAnnotationIntrospector();
    AnnotationIntrospector pair = new AnnotationIntrospectorPair(primary, secondary);
    mapper.setAnnotationIntrospector(pair);
    try {
        json = mapper.writeValueAsString(obj);
        /*
         * if(json != null ) { json = getLoggableString(json); }
         */
    } catch (Exception e) {
        return "Unable to convert to Json object:" + obj.toString() + " Message: " + e.getMessage();

    }

I am using Jackson ObjectMapper to convert objct to Json like. I need to customize Object Mapper to mask cardNumber field in return json. Please suggest

[Tatu Saloranta]

By masking, do you mean that output String should be some other static String (like "xxxxxx")?

One possibility would be a simple custom serializer. Slightly simpler could be using `@JsonSerializer(converter=MaskingConverter.class)` where MaskingConverter would implement Converter<String,String>.

And to make your custom annotation indicate use of this, you would define it as:

  @Retention(RetentionPolicy.RUNTIME)

  @JacksonAnnotationsInside

  @JsonSerializer(converter=MaskingConverter.class)`

  public @interface @MaskSensitiveData { }

which would just mean that all annotations included should be added to ones for annotated entity (method)

-+ Tatu +-

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