NPE when access --------------- 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 -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://opensource.atlassian.com/projects/hibernate/secure/Administrators.... - For more information on JIRA, see: http://www.atlassian.com/software/jira