NPE if HQL refers to nonexistant variable ----------------------------------------- Key: HHH-1897 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1897 Project: Hibernate3 Issue Type: Bug Components: query-hql Affects Versions: 3.2.0.cr2 Reporter: Koda Janh Assignee: Diego Pires Plentz Given the query: "from mobi.gateway.domain.Server as server where server not in (select user.server from mobi.gateway.domain.User where user.server is not null) group by server.hostname order by count(server.port) desc limit 1" Hibernate throws this exception: java.lang.NullPointerException at org.hibernate.hql.ast.tree.IdentNode.resolveAsNakedComponentPropertyRefLHS(IdentNode.java:195) at org.hibernate.hql.ast.tree.IdentNode.resolve(IdentNode.java:85) at org.hibernate.hql.ast.tree.DotNode.resolveFirstChild(DotNode.java:139) at org.hibernate.hql.ast.HqlSqlWalker.lookupProperty(HqlSqlWalker.java:469) at org.hibernate.hql.antlr.HqlSqlBaseWalker.propertyRef(HqlSqlBaseWalker.java:1080) at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectExpr(HqlSqlBaseWalker.java:1877) at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectExprList(HqlSqlBaseWalker.java:1821) at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectClause(HqlSqlBaseWalker.java:1392) at org.hibernate.hql.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:553) at org.hibernate.hql.antlr.HqlSqlBaseWalker.collectionFunctionOrSubselect(HqlSqlBaseWalker.java:4243) at org.hibernate.hql.antlr.HqlSqlBaseWalker.inRhs(HqlSqlBaseWalker.java:4152) at org.hibernate.hql.antlr.HqlSqlBaseWalker.comparisonExpr(HqlSqlBaseWalker.java:3859) at org.hibernate.hql.antlr.HqlSqlBaseWalker.logicalExpr(HqlSqlBaseWalker.java:1758) at org.hibernate.hql.antlr.HqlSqlBaseWalker.whereClause(HqlSqlBaseWalker.java:776) at org.hibernate.hql.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:577) at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:281) at org.hibernate.hql.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:229) at org.hibernate.hql.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:227) at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:159) at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:110) at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:77) at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:56) at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:71) at org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:133) at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:112) at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1612) if I add "as user" after "mobi.gateway.domain.User" the problem goes away. I would expect Hibernate to handle this more gracefully and maybe explain there is a mistake in the HQL statement, such as "user is undefined".