java - JPA CriteriaAPI: correct usage of isMember() -

i using jpas criteria api request objects form database , apply filter request.

the following code shows method assambles , executes query:

@override     public list<myclass> findall(myclassfilterobject filter) {         final criteriabuilder builder = this.getentitymanager().getcriteriabuilder();         final criteriaquery<myclass> criteriaquery = builder.createquery(myclass);          root<myclass> root = criteriaquery.from(myclass);         list<predicate> criterialist = new linkedlist<predicate>();         if (!filter.getmyclassstatus().equals("")) {             path<string> statuspath = root.get("myclassstatus");             criterialist.add(builder.equal(statuspath, myclassstatus.valueof(filter.getmyclassstatus())));         }         if (!filter.getmyclasstype().equals("")) {             expression<set<myclasstype>> myclasstypesquery = root.get("myclasstype");             criterialist.add(builder.ismember(myclasstype.valueof(filter.getmyclasstype()), myclasstypesquery));         }         if (criterialist.size()>0){             criteriaquery.where(builder.and(criterialist.toarray(new predicate[criterialist.size()])));         }         typedquery<myclass> typedquery = this.getentitymanager().createquery(criteriaquery);         typedquery.setfirstresult(filter.getpagenumber() * 10);         typedquery.setmaxresults(10);         list<myclass> myclasss = typedquery.getresultlist();          if (myclasss.isempty()) {             return new linkedlist<myclass>();         }          return myclasss;     } 

this code returns same 2 objects, no matter choose "myclasstype". myclass has set of myclasstype (an enum value) objects attached , want know if myclasstype object filter member of collection

i not sure if using ismember method right