Get field names of a class in Java

I am trying to generate a CSV mapping for the fields of a class in Java in an automatic way since I need to use it several times.

I have the following method for trying to get the field names: (where CSV header is something like "DB_NAME|FIELD_NAME|ADDITIONAL_F1|ADDITIONAL_F1")

public static String generateCsvAttributesMapping(Class<WhateverClassName> model) {

    StringBuilder csvBuilder = new StringBuilder(CSV_HEADER);

    Field[] fieldList = model.getDeclaredFields();
    for (Field field : fieldList) {
        field.setAccessible(true);
        csvBuilder.append(field.getName().replaceAll("(.)(\\p{Upper})", "$1_$2").toUpperCase());
        csvBuilder.append("|");
        csvBuilder.append(field.getName());
        csvBuilder.append("||\n");
    }
   return formatOutput(csvBuilder.toString());
}

and a test call like:

@Test
public void testGenerationWithObject() {
    log.info(CsvAttributesMappingGenerator.generateCsvAttributesMapping(WhateverClassName.class));
}

The output should have multiple rows like FIELD_NAME|fieldName|| where the camel cased item should be collected from the given class. I attempted to use Java Reflection API as I have seen on several examples but I get a strange String output instead. (not the serialized @randomCharsLikeName). Tried toString() and other dirty tricks but nothing worked.

Can someone tip me up a little with this? Or at least tell me if it is possible to do what I tried? Thanks in advane!