@Override public InspectPojo createImpl() {
_val = DKV.get(key);
if( _val == null ) throw new IllegalArgumentException("Key not found");
if( off < 0 ) throw new IllegalArgumentException("Offset must not be negative");
if( len < 0 ) throw new IllegalArgumentException("Length must not be negative");
InspectPojo i = new InspectPojo(_val,off, len);
return i;
}