I have a jsp client that gain access to the business layer by RMI protocol and
the data access layer managed by hibernate.

I have noted that the domain object provided by my business layer is not indipendent
from hibernate since the CGLIB library insert code into the object.

i would that my client is indipendent if possible because this features give me some problem,
for example the client must have the hibernate jar library.

I suggest NOT using lazy="true" on any objects you may want to send to the client and also you may need to pass your objects through a filter that will replace Hibernate's collection implementations with standard ones.
Something like this:
p = o.getProperty(name);
if( isCollection( p ) ){
o.setProperty( name, toStandardCollection( p ) );
}