convert uuid to byte, that works when using UUID.nameUUIDFromBytes(b)

Question

I am converting UUID to byte using this code

public byte[] getIdAsByte(UUID uuid)
{
    ByteBuffer bb = ByteBuffer.wrap(new byte[16]);
    bb.putLong(uuid.ge         


        

Answer 1

that's because nameUUIDFromBytes constructs a specific kind of UUID (as the javadoc states).

if you want to convert a byte[] back to a UUID, you should use the UUID constructor. Wrap a ByteBuffer around the byte[], read the 2 longs and pass them to the UUID constructor.