first of all,sorry about no test case supplying.i'll try my best to to give the issue i encoutered a complete clarity.
similar code fragment comes following:

/** 
* @author 作者 E-mail: kingviker@163.com
* @version 创建时间：Jun 6, 2016 4:04:21 PM 
* 类说明 
*/
public class test {
	
	
}
 
class A {
	
}

class B{
	@ManyToOne(cascade = CascadeType.DETACH,fetch = FetchType.LAZY)
	@JoinColumn(name="buse_businessid",updatable=false,insertable=false,nullable=true)
	private Set<A> as;
	....
	
	public Set<A> getAs(){
		if(!Hibernate.isInitialized(as)){
			try{
				Hibernate.initialize(as);
			}catch(HibernateException e){
				as = null;
			}
		}
		return as;
	}
}

class C{
	@ManyToOne(cascade = CascadeType.DETACH,fetch = FetchType.LAZY)
	@JoinColumn(name="xxxx",updatable=false,insertable=false,nullable=true)
	@NotFound(action=NotFoundAction.IGNORE)
	private Set<A> as;
	
	...
	getters and setters
	...
}

as the code i post above, when i seach B by a hql like this:

from B 

I get a List<B> b_list,and the feild of B:as(Set<A>) is in a status of lazy loading.at present ,everything is fine.

but in the same session, i request another hql like this:

from C

before the sql is executed ,an exception is throwed out:org.hibernate.ObjectNotFoundException: No row with the given identifier exists: xxxx

i am not sure whether the sql is executed the exception is throwed out ,but there's no sql sentences printing on console.

1:if i remove the @notfound annotation in C , or i add @NotFound in B's field:as; it'll work fine
2:both of the two sql sentences work fine in separate session.
my analysis:
1.@NotFound will override load strategy to EAGER.while

from B

and

from C

both refer some same entities of A as annotated with@oneTomany.,i guess when

from C

is executed ,it's eager to load it's field :set<A> as,but it is annotated with@notFound ,it should not throw out any exception if there are some entities of A not existing(it does have)
,but the truth is it did throw out Objectnotfoundexception.
i guess when

from C

is executed while some of Set<A> as in C are proxied in a lazy loading status in B; it will trigger to load Set<A> as in B?, if the trigger mechanism exists,it also should not throw out ObjectNotFoundException due to the code in getAs() of B.