ClassNotFoundException when deserializing a binary class file's contents

Question

I don\'t know much about Java. I\'m trying to read a file containing an int and various instances of a class called \"Automobile\". When I deserialize it, though, the progra

Answer 1

This is and old question but this may help someone else. I faced the same issue and the problem was that I was not using the current thread class loader. You will find below the serializer class that I used in a grails project, should be quite straightforward use this in java Hope this helps

public final class Serializer {

/**
 * Converts an Object to a byte array.
 *
 * @param object, the Object to serialize.
 * @return, the byte array that stores the serialized object.
 */

public static byte[] serialize(T object) {

    ByteArrayOutputStream bos = new ByteArrayOutputStream()
    ObjectOutput out = null
    try {
        out = new ObjectOutputStream(bos)
        out.writeObject(object)

        byte[] byteArray = bos.toByteArray()
        return byteArray

    } catch (IOException e) {
        e.printStackTrace()
        return null

    } finally {
        try {
            if (out != null)
                out.close()
        } catch (IOException ex) {
            ex.printStackTrace()
            return null
        }
        try {
            bos.close()
        } catch (IOException ex) {
            ex.printStackTrace()
            return null
        }
    }

}

/**
 * Converts a byte array to an Object.
 *
 * @param byteArray, a byte array that represents a serialized Object.
 * @return, an instance of the Object class.
 */
public static Object deserialize(byte[] byteArray) {
    ByteArrayInputStream bis = new ByteArrayInputStream(byteArray)
    ObjectInput input = null
    try {
        input = new ObjectInputStream(bis){
            @Override protected Class resolveClass(final ObjectStreamClass desc) throws IOException, ClassNotFoundException {
                ClassLoader cl = Thread.currentThread().getContextClassLoader();
                if (cl == null)  return super.resolveClass(desc);
                return Class.forName(desc.getName(), false, cl);
            }
        };
        Object o = input.readObject()
        return o

    } catch (ClassNotFoundException | IOException e) {
        e.printStackTrace()
        return null
    } finally {
        try {
            bis.close()
        } catch (IOException ex) {
        }
        try {
            if (input != null)
                input.close()
        } catch (IOException ex) {
            ex.printStackTrace()
            return null
        }
    }
}