Casting problem at CSWClientDemo of geotoolkit

Question

I tried to test CSWClientDemo of geotoolkit but couldn't succeed.

Here is a casting problem:

  GetRecordsResponseType response = ((JAXBElement<GetRecordsResponseType>) um.unmarshal(is)).getValue();

The error I got is:

Exception in thread "main" java.lang.ClassCastException: org.geotoolkit.ows.xml.v100.ExceptionReport cannot be cast to javax.xml.bind.JAXBElement
    at test.CSWClientDemo.main(CSWClientDemo.java:71) 

(meanwhile, I imported org.apache.sis.xml.MarshallerPool instead of org.geotoolkit.xml.MarshallerPool.)