Java Utililty Methods Json to Object

if (json == null)
    return null;
try {
    return objectMapper.readValue(json, clazz);
} catch (Exception e) {
    throw new IllegalStateException("Unable to parse Json String.", e);

 convert json string to class Object. 
try {
    return MAPPER.readValue(json, valueType);
} catch (Exception ex) {
    throw new RuntimeException(ex);

if (json == null) {
    return null;
try {
    return objectMapper.readValue(json, toValueType);
} catch (Exception e) {
    throw new RuntimeException("json to object failed :" + e.getMessage());

Gson gson = new GsonBuilder().registerTypeHierarchyAdapter(Date.class, new JsonSerializer<Date>() {
    @Override
    public JsonElement serialize(Date src, Type typeOfSrc, JsonSerializationContext context) {
        SimpleDateFormat format = new SimpleDateFormat(dateformat);
        return new JsonPrimitive(format.format(src));
}).setDateFormat(dateformat).create();
Object object = gson.fromJson(jsonString, (Type) classOfT);
...

try {
    T t = MAPPER.readValue(jsonData, beanType);
    return t;
} catch (Exception e) {
    e.printStackTrace();
return null;

Map jsonJavaRootObject = new Gson().fromJson(jsonLine, Map.class);
return jsonJavaRootObject;

ObjectMapper objectMapper = new ObjectMapper();
objectMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
try {
    return objectMapper.readValue(jsonStr, valueType);
} catch (Exception e) {
    e.printStackTrace();
return null;
...

if (input == null || input.isEmpty())
    return "";
final int len = input.length();
final StringBuilder result = new StringBuilder(len + len / 4);
final StringCharacterIterator iterator = new StringCharacterIterator(input);
char ch = iterator.current();
while (ch != CharacterIterator.DONE) {
    if (ch == '\n') {
...