Java Utililty Methods Object Serialize

serialize(obj, new File(fname), gzipped);

String output;
if (objData == null) {
    return null;
ObjectMapper mapper = new ObjectMapper();
ByteArrayOutputStream os = new ByteArrayOutputStream();
mapper.writeValue(os, typeOfT);
output = new String(os.toByteArray(), "UTF-8");
...

ByteArrayOutputStream byteStream;
ObjectOutput output;
byte[] objectBytes;
byteStream = new ByteArrayOutputStream();
output = new ObjectOutputStream(byteStream);
output.writeObject(object);
output.close();
objectBytes = byteStream.toByteArray();
...

return convertObjectToBytes(object);

ObjectOutputStream oos = null;
ByteArrayOutputStream baos = null;
try {
    baos = new ByteArrayOutputStream();
    oos = new ObjectOutputStream(baos);
    oos.writeObject(object);
    byte[] bytes = baos.toByteArray();
    return bytes;
...

ByteArrayOutputStream baos = null;
BufferedOutputStream bos = null;
ObjectOutputStream oos = null;
try {
    baos = new ByteArrayOutputStream();
    bos = new BufferedOutputStream(bos);
    oos = new ObjectOutputStream(bos);
    oos.writeObject(object);
...

try (ByteArrayOutputStream buffer = new ByteArrayOutputStream(4096)) {
    try (ObjectOutputStream output = new ObjectOutputStream(buffer)) {
        output.writeObject(object);
    return buffer.toByteArray();
} catch (IOException e) {
    throw new RuntimeException(e);

try (ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(baos)) {
    oos.writeObject(object);
    oos.flush();
    byte bytes[] = baos.toByteArray();
    return Base64.getEncoder().encodeToString(bytes);

try (ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        ObjectOutputStream objectOutputStream = new ObjectOutputStream(byteArrayOutputStream)) {
    objectOutputStream.writeObject(object);
    objectOutputStream.flush();
    return byteArrayOutputStream.toByteArray();

ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
ObjectOutputStream objectOut = new ObjectOutputStream(byteOut);
objectOut.writeObject(object);
objectOut.close();
return byteOut.toByteArray();