How to get shared calendar list using caldav4j from davical?

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I created my own calendar using netbeans, caldav4j and Davical. However, I can't get shared calendar list.
I can create a calendar or an event. I can see them at Agendav. But when I share calendar to other users at Agendav, I can't get it with my netbeans code.
I want to show which user shared calendar with me.
HttpClient http = createHttpClient();
HostConfiguration hostConfig = createHostConfiguration();

PropFindMethod propfind = new PropFindMethod();
propfind.setPath(caldavCredential.home);

PropProperty propFindTag = PropertyFactory.createProperty(PropertyFactory.PROPFIND);
PropProperty aclTag = PropertyFactory.createProperty(PropertyFactory.ACL);
PropProperty propTag = new PropProperty(CalDAVConstants.NS_DAV,"D","prop");
propTag.addChild(aclTag);
propFindTag.addChild(propTag);
propfind.setPropFindRequest(propFindTag);
propfind.setDepth(0);

executeMethod(hostConfig, propfind);

Set keySet = (propfind.getResponseHashtable()).keySet();
for(String key: keySet){
CalDAVResponse response = (propfind.getResponseHashtable()).get(key);
String href = response.getHref();

Ace[] aces = propfind.getAces(href);
Enumeration enumerations = aces.enumeratePriviliges();
while(enumerations.hasMoreElements()){
Privilege privilege = (Privilege)enumerations.nextElement();
System.out.println("parameter: " + privilege.getParameter());
}
}
I try to get privileges but there is no parameter. I only want which user shared calendars with me. I can make calendar, add event but I can't access shared calendar list.