[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-2993) NPE on org.hibernate.hql.ast.HqlSqlWalker, When Using explicit inner join on primitive type

[Nathan Deckard (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-2993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=35107#action_35107 ] 

Nathan Deckard commented on HHH-2993:
-------------------------------------

I just encountered this issue as well. 

Although it is caused by a mistake in the HQL, it is not easy to decipher from the stack trace that the query attempts to inner join to a primitive. A meaningful exception (other than NPE) would be very helpful here.

> NPE on org.hibernate.hql.ast.HqlSqlWalker,  When Using explicit inner join on primitive type
> --------------------------------------------------------------------------------------------
>
>                 Key: HHH-2993
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2993
>             Project: Hibernate Core
>          Issue Type: Bug
>         Environment: Hibernate 3.2.5ga , oracle 10G, Windows
>            Reporter: Vincent YSMAL
>            Assignee: Gail Badner
>
> Hi, trying to make an inne join on a primitve type cause an NPE.
> java.lang.NullPointerException
> 	at org.hibernate.hql.ast.HqlSqlWalker.createFromJoinElement(HqlSqlWalker.java:310)
> 	at org.hibernate.hql.antlr.HqlSqlBaseWalker.joinElement(HqlSqlBaseWalker.java:3275)
> 	at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:3067)
> 	at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:2945)
> 	at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromClause(HqlSqlBaseWalker.java:688)
> 	at org.hibernate.hql.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:544)
> 	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:228)
> 	at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:160)
> 	at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:111)
> 	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:72)
> 	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:1623)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> 	at java.lang.reflect.Method.invoke(Method.java:597)
> 	at org.springframework.orm.hibernate3.HibernateTemplate$CloseSuppressingInvocationHandler.invoke(HibernateTemplate.java:1219)
> Trying some HQL like this :
> "from Cat as cat inner join cat.name as a0 " cause an NPE

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