private static Undefined readUndefined(DataInput in) throws IOException, ClassNotFoundException {
    Undefined o = (Undefined) QueryService.UNDEFINED;
    InternalDataSerializer.invokeFromData(o, in);
    return o;
  }
Reads an instance of <code>IpAddress</code> from a <code>DataInput</code>.

@throws IOException A problem occurs while reading from <code>in</code>
geode-core/src/main/java/org/apache/geode/internal/DSFIDFactory.java