nested DetachedCriteria throwing NullPointerException ----------------------------------------------------- Key: HHH-158 URL: https://hibernate.onjira.com/browse/HHH-158 Project: Hibernate ORM Issue Type: Bug Components: core Affects Versions: 3.0 beta 4 Reporter: Jérôme Boehm Assignee: Gavin King Attachments: testcase.zip It seems that it is not possible to nest DetachedCriteria. This is examplified in the testWithReturnedObject() method of the attached TestCase. When nesting DetachedCriteria using DetachedCriteria.add(Subqueries.<a_Subqueries_static_method>) twice, we get the following exception: java.lang.NullPointerException at org.hibernate.criterion.SubqueryExpression.getTypedValues(SubqueryExpression.java:73) at org.hibernate.loader.criteria.CriteriaQueryTranslator.getQueryParameters(CriteriaQueryTranslator.java:230) at org.hibernate.criterion.SubqueryExpression.toSqlString(SubqueryExpression.java:50) at org.hibernate.criterion.Junction.toSqlString(Junction.java:58) at org.hibernate.loader.criteria.CriteriaQueryTranslator.getWhereCondition(CriteriaQueryTranslator.java:312) at org.hibernate.loader.criteria.CriteriaLoader.<init>(CriteriaLoader.java:92) at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1208) at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:299) at test.subqueries.SubqueriesTest.main(SubqueriesTest.java:41) Then, after "correcting" SubqueryExpression so that the params instance variable is initialized (see the attached Corrected_SubqueryExpression), it seems that the nested aliases are not properly propagated, which is examplified in testWithNoReturnedObject(). The generated sql is: select this_.a_id as a1_0_ from a this_ where exists (select this0__.b_id as y0_ from b this0__ where this0__.a_id=this_.a_id and exists (select this0__.c_id as y0_ from c this0__ where this0__.b_id=this0__.b_id)) I think it should be (notice the this1__ alias for table c): select this_.a_id as a1_0_ from a this_ where exists (select this0__.b_id as y0_ from b this0__ where this0__.a_id=this_.a_id and exists (select this1__.c_id as y0_ from c this1__ where this1__.b_id=this0__.b_id))