Removing null and empty objects from the JSON Response(Spring REST) with empty object inside empty object

Using Jackson you can easy set your preferences to serialize your objects

ObjectMapper objectMapper = new ObjectMapper();
objectMapper.enable(SerializationFeature.INDENT_OUTPUT);
objectMapper.setSerializationInclusion(Include.NON_NULL);
objectMapper.setSerializationInclusion(Include.NON_EMPTY);
ObjectWriter writer = objectMapper.writer();
System.out.println(writer.writeValueAsString(YOUR_OBJECT));

I got this:

{
  "implDisplayablePricePlan" : [ {
    "productSpecPricing" : { },
    "assignedPricePlanID" : "abc",
    "name" : "GOLD",
    "action" : "Something",
    "status" : "Something",
    "selected" : true,
    "crossProductDiscount" : false,
    "displayInformation" : {
      "visible" : true,
      "enalble" : false
    }
  } ]
}

as productSpecPricing isn't null (or empty array/collection) it's shown, to solve it you have to add a filter:

annotate the class that contains the productSpecPricing property with @JsonFilter("myFilter")

FilterProvider filters = new SimpleFilterProvider().addFilter("myFilter", filter);
ObjectWriter writer = objectMapper.writer(filters);

Filter:

PropertyFilter filter = new SimpleBeanPropertyFilter() {

    @Override
    public void serializeAsField(Object pojo, JsonGenerator jgen,
            SerializerProvider provider, PropertyWriter writer)
                    throws Exception {
        if (include(writer)) {
            System.out.println(writer.getName());
            if (!writer.getName().equals("productSpecPricing")) {
                writer.serializeAsField(pojo, jgen, provider);
                return;
            } else {
                ProductSpecPricing productSpecPricing = ((YOU_OBJECT) pojo).getProductSpecPricing();
                if (productSpecPricing != null && productSpecPricing.getChildPricingSchema() != null && !productSpecPricing.getChildPricingSchema().isEmpty()) {
                    writer.serializeAsField(pojo, jgen, provider);
                }
            }
        } else if (!jgen.canOmitFields()) {
            writer.serializeAsOmittedField(pojo, jgen, provider);
        }
    }

    @Override
    protected boolean include(PropertyWriter writer) {
        return true;
    }

    @Override
    protected boolean include(BeanPropertyWriter writer) {
        return true;
    }
};

after apply the filter the result is:

{
  "implDisplayablePricePlan" : [ {
    "assignedPricePlanID" : "abc",
    "name" : "GOLD",
    "action" : "Something",
    "status" : "Something",
    "selected" : true,
    "crossProductDiscount" : false,
    "displayInformation" : {
      "visible" : true,
      "enalble" : false
    }
  } ]
}

It depends on how you are getting/creating the JSON file.

If you are creating it, then, during creation, if a value is non-existant, null, void or any other you do not desire, do not insert it.

However, if you are receiving this JSON from others, then during parse, get the key/pair value, again, if you do not want it, do not add to your object.

Without details from your program, we cant help further

Edit 1:

$input = file_get_contents($name, "r");
if($input != FALSE) {
    for($i=0;$i<strlen($input);$i++){
        if($input[$i]=='{'){
            $begin= $i;
        } else if($input[$i]=='}'){
            $buffer .= substr($input,$begin,$i-$begin+1) .",";
            if (strpos($buffer,'":null') !== false) {
                // Drop the current line
            } else {
                // Line is correct, keep on writting
            }
            if($counter>=100 ){
                $counter= 0;
                save($buffer);
                $buffer = "";
            }
        } else if($input[$i]==']'){
            save($buffer);
            $buffer = "";
            $i = strlen($input);
        }
    }


}

In it, we will first successfully get the JSON file. Then, open the file, read each "section" (or object) of a JSON structure, then do as we must (in my case, I would fix the input, but I guess you can just drop it.)