StreamCorruptedException invalid stream header

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Java

I sent a stringed byte array which was initially a serialized object class to my php server side so that i can save it into my mysql database as a TEXT

String temp = new String(facetemplate, Charset.forName("UTF-8"));
String feat = new String(facefeatures, Charset.forName("UTF-8"));

I convert the String back to a byte array but when i wan to convert it back to an object it gives me

java.io.StreamCorruptedException: invalid stream header: 3F3F0573

This is how i did my conversion back to an object

 /**
 * Converts byte array to object
 * @param byteobject
 * @return byte[] byte
 * @throws IOException
 * @throws ClassNotFoundException
 **/
public static Object DeSerialise(byte[] byteobject) throws IOException, ClassNotFoundException
{
    ByteArrayInputStream in = new ByteArrayInputStream(byteobject);
    ObjectInputStream is = new ObjectInputStream(in);
    return is.readObject();
}

Serializing my object class

/**
     * Serialises an object to a file
     *
     * @param <T>
     *
     * @param obj
     * @throws FileNotFoundException
     */

    public static <T> void SerializeObject(Context context, T obj)
            throws FileNotFoundException, IOException {
        File cache = new File(context.getCacheDir(), config.FILE_NAME);

        if (!cache.exists())
            cache.createNewFile();
        FileOutputStream fos = new FileOutputStream(cache);

        ObjectOutputStream out = new ObjectOutputStream(fos);

        out.writeObject(obj);
        out.close();

    }

but for further information on how i turned my class to bytes please see the link below
http://stackoverflow.com/questions/28673243/object-to-byte-arrray-conversion-and-byte-array-to-string-conversion[^]

am not sure why but i am guessing it is because of the string conversion i did initially before sending it. Not really an expert so any help would be greatly appreciated. Thanks