[Hibernate-issues] [Hibernate-JIRA] Created: (HHH-1897) NPE if HQL refers to nonexistant variable

[Koda J. (JIRA) <no...@at...>]

NPE if HQL refers to nonexistant variable
-----------------------------------------

         Key: HHH-1897
         URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1897
     Project: Hibernate3
        Type: Bug

  Components: query-hql  
    Versions: 3.2.0.cr2    
    Reporter: Koda Janh


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".

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