code: public Object sqlToJava(Object source)
      {
          try
          {
              ByteArrayInputStream stringIn =
                  new ByteArrayInputStream(((String) source).getBytes());
              Base64.InputStream uuIn =
                  new Base64.InputStream(stringIn, Base64.DECODE, false);
              GZIPInputStream gzipIn = new GZIPInputStream(uuIn);
              ObjectInputStream objIn = new ObjectInputStream(gzipIn);
              Object result = objIn.readObject();
  
              objIn.close();
              return result;
          }
          catch (Throwable t)
          {
              throw new ConversionException(t);
          }
      }
docs: /*
  * @see FieldConversion#sqlToJava(Object)