使用hessian与java web通讯 failed to lazily initialize a collection, no session or ses

使用hessian与java web通讯 failed to lazily initialize a collection, no session or session was closed
报错:
Caused by: org.hibernate.LazyInitializationException: failed to lazily initialize a collection, no session or session was closed

原因:
是hibernate对子表关联中的set是persistenSet,要转成HashSet,才不会报错

如这里的art.getComments()就是被hibernate还回的persistenSet
Iterator ite = art.getComments().iterator();
while(ite.hasNext()){
set.add((Comment)ite.next());
}
art.setComments(set);