[hibernate-issues] [Hibernate-JIRA] Updated: (HHH-5537) NPE when accessing composite id of derived property in hql

[Gail Badner (JIRA)]

     [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-5537?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gail Badner updated HHH-5537:
-----------------------------

    Summary: NPE when accessing composite id of derived property in hql  (was: NPE when access)

> NPE when accessing composite id of derived property in hql
> ----------------------------------------------------------
>
>                 Key: HHH-5537
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5537
>             Project: Hibernate Core
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 3.5.5
>         Environment: Hibernate version: 3.5.5
> Database: Oracle 10g, hsqldb (Test case is for hsqldb)
>            Reporter: Wilhelm Kleu
>         Attachments: hibernate-hql-bug.zip
>
>
> The test case has an entity (Person) with a derived property that maps to another entity (Alias) using a specific formula.
> This other entity has a composite key.
> When retrieving Person everything seems to map correctly on the object.
> A NullPointerException is thrown when using the id of the the derived property in a HQL query:
> {quote}
> java.lang.NullPointerException
> 	at org.hibernate.persister.entity.AbstractPropertyMapping.toColumns(AbstractPropertyMapping.java:103)
> 	at org.hibernate.persister.entity.BasicEntityPropertyMapping.toColumns(BasicEntityPropertyMapping.java:62)
> 	at org.hibernate.persister.entity.AbstractEntityPersister.toColumns(AbstractEntityPersister.java:1443)
> 	at org.hibernate.hql.ast.tree.FromElementType.toColumns(FromElementType.java:354)
> 	at org.hibernate.hql.ast.tree.FromElementType.toColumns(FromElementType.java:323)
> 	at org.hibernate.hql.ast.tree.FromElement.toColumns(FromElement.java:491)
> 	at org.hibernate.hql.ast.tree.DotNode.getColumns(DotNode.java:133)
> 	at org.hibernate.hql.ast.tree.DotNode.initText(DotNode.java:252)
> 	at org.hibernate.hql.ast.tree.DotNode.resolve(DotNode.java:246)
> 	at org.hibernate.hql.ast.tree.FromReferenceNode.resolve(FromReferenceNode.java:117)
> 	at org.hibernate.hql.ast.tree.FromReferenceNode.resolve(FromReferenceNode.java:113)
> 	at org.hibernate.hql.ast.HqlSqlWalker.resolve(HqlSqlWalker.java:868)
> 	at org.hibernate.hql.antlr.HqlSqlBaseWalker.expr(HqlSqlBaseWalker.java:1323)
> 	at org.hibernate.hql.antlr.HqlSqlBaseWalker.exprOrSubquery(HqlSqlBaseWalker.java:4387)
> 	at org.hibernate.hql.antlr.HqlSqlBaseWalker.comparisonExpr(HqlSqlBaseWalker.java:3860)
> 	at org.hibernate.hql.antlr.HqlSqlBaseWalker.logicalExpr(HqlSqlBaseWalker.java:1909)
> 	at org.hibernate.hql.antlr.HqlSqlBaseWalker.whereClause(HqlSqlBaseWalker.java:824)
> 	at org.hibernate.hql.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:610)
> 	at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:294)
> 	at org.hibernate.hql.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:237)
> 	at org.hibernate.hql.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:254)
> 	at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:185)
> 	at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:136)
> 	at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:101)
> 	at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:80)
> 	at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:98)
> 	at org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:156)
> 	at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:135)
> 	at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1760)
> 	at com.example.Tests.testReportedBug(Tests.java:48)
> {quote}
> I attached a simple test case that shows the exception being thrown. See: Tests.java

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