Thanks to @reporter and some trial and error. Here is a working solution.
HashMap<String, Object> map = new LinkedHashMap<>();
PropertyIterator pi;
try {
pi = node.getProperties();
//Get properties for the root node
while(pi.hasNext())
{
Property p = pi.nextProperty();
String name = p.getName();
String val;
//determine if property is multi-value
if (p.isMultiple()) {
//multi-value property
val=p.getValues().toString();
} else {
//single-value property
val = p.getValue().getString();
}
map.put(name,val);
}//end of while for properties of root node
} catch (RepositoryException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}