[hibernate-issues] [Hibernate-JIRA] Resolved: (HHH-3310) Using Nested DetachedCriteria (Sub-Selects) throwing NullPointerException

[Diego Plentz (JIRA)]

     [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-3310?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Diego Plentz resolved HHH-3310.
-------------------------------

      Assignee: Diego Plentz
    Resolution: Duplicate

> Using Nested DetachedCriteria (Sub-Selects) throwing NullPointerException
> -------------------------------------------------------------------------
>
>                 Key: HHH-3310
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3310
>             Project: Hibernate Core
>          Issue Type: Bug
>    Affects Versions: 3.2.5
>         Environment: Hibernate 3.2.5, Oracle 10g
>            Reporter: Roshan Dawrani
>            Assignee: Diego Plentz
>         Attachments: Nested_Subselects.zip
>
>
> Hi,
> We have come across an issue with the usage of nested subselects in the sql query with hibernate 3.2.5.
> 	
> We get the following exception when there is more than one level of sub-selects in the query :
> ----------------------------------------------------------------------------------------------------------------------
> 	java.lang.NullPointerException
> 		at org.hibernate.criterion.SubqueryExpression.getTypedValues(SubqueryExpression.java:80)
> 		at org.hibernate.loader.criteria.CriteriaQueryTranslator.getQueryParameters(CriteriaQueryTranslator.java:251)
> 		at org.hibernate.criterion.SubqueryExpression.toSqlString(SubqueryExpression.java:55)
> 		at org.hibernate.loader.criteria.CriteriaQueryTranslator.getWhereCondition(CriteriaQueryTranslator.java:334)
> 		at org.hibernate.loader.criteria.CriteriaJoinWalker.<init>(CriteriaJoinWalker.java:71)
> 		at org.hibernate.loader.criteria.CriteriaLoader.<init>(CriteriaLoader.java:67)
> 		at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1550)
> 		at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:283)
> 	at NestedDetachedCriteriaTest.testNestedDetachedCriteria(Unknown Source)
> ----------------------------------------------------------------------------------------------------------------------
> The actual query that gets fired is like:
> ----------------------------------------------------------------------------------------------------------------------
> select this_.name as y0_ from cat this_ where this_.name = 
> 	(select this0__.name as y0_ from cat this0__ where this0__.parent_id = 
> 		(select this0__.parent_id as y0_ from cat this0__ where this0__.name = 
> 			(select this0__.name as y0_ from cat this0__ where this0__.cat_id = ?)))
> ----------------------------------------------------------------------------------------------------------------------
> 					
> We investigated the issue and have fixed it by making some changes in org.hibernate.criterion.SubqueryExpression class. 
> The attached file has the following contents:
> 	1. SubqueryExpression.java - Fix we have made to SubqueryExpression class.
> 	2. NestedDetachedCriteriaTest.zip - A test case to highlight the nested sub-select issue (testNestedDetachedCriteria).
> Regards,
> Roshan

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