[hibernate-issues] [Hibernate-JIRA] Closed: (HHH-1895) HqlSqlWalker throws NullPointerException with explicit joins and component mapping

[Steve Ebersole (JIRA)]

     [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-1895?page=all ]
     
Steve Ebersole closed HHH-1895:
-------------------------------

    Resolution: Rejected

If this worked in Hibernate2 (which I seriously, seriously doubt) it was totally by accident and not a supported syntax.  

And it is still not a supported syntax.

> HqlSqlWalker throws NullPointerException with explicit joins and component mapping
> ----------------------------------------------------------------------------------
>
>          Key: HHH-1895
>          URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1895
>      Project: Hibernate3
>         Type: Bug

>     Versions: 3.1.3
>  Environment: Oracle 9i, Hibernate 3.1.3
>     Reporter: Victor Suarez
>     Priority: Minor

>
>
> HqlSqlWalker throws a NPE if a explicit join is used with fields that are mapped with component mapping. If explicit join is removed and implicit join is used, the HQL works fine. This kind of problem didn't occur with Hibernate2.
> Examples (hbm below): 
> The query:
> String query = "FROM " + Pais.class.getName() + " AS pais JOIN pais.metaInfo AS minfo WHERE minfo.activo = true";
> fails with this stacktrace:
> Exception in thread "main" java.lang.NullPointerException
>    at org.hibernate.hql.ast.HqlSqlWalker.createFromJoinElement(HqlSqlWalker.java:317)
>    at org.hibernate.hql.antlr.HqlSqlBaseWalker.joinElement(HqlSqlBaseWalker.java:3268)
>    at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:3060)
>    at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:2938)
>    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:218)
>    at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:158)
>    at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:109)
>    at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:75)
>    at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:54)
>    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:1583)
> This one works fine:
> String query = "FROM " + Pais.class.getName() + " AS pais WHERE pais.metaInfo.activo = true";
> With this behaviour, HQL seems not to be totally transparent to mappings.
> Mapping file:
> <hibernate-mapping>
>    <class name="Pais" table="Paises" lazy="true">
>       <id name="id" type="long" column="id">
>          <generator class="increment"/>
>       </id>
>       <component name="metaInfo" class="MetaInfo">
>          <property name="usuarioAlta" column="usuarioAltaMetaInfo" type="string" not-null="false"/>
>          <property name="fechaBaja" column="fechaBajaMetaInfo" type="timestamp" not-null="false"/>
>          <property name="fechaAlta" column="fechaAltaMetaInfo" type="timestamp" not-null="false"/>
>          <property name="activo" column="activoMetaInfo" type="boolean" not-null="false"/>
>          <property name="usuarioBaja" column="usuarioBajaMetaInfo" type="string" not-null="false"/>
>       </component>
>       <property name="nombre" column="nombre" type="string" not-null="true"/>
>       <property name="codigo" column="codigo" type="string" not-null="false"/>
>       
>       <set name="localidades" access="field" inverse="true"
>          cascade="all-delete-orphan" lazy="true" batch-size="5">
>          <key column="pais" />
>          <one-to-many class="Localidad"/>
>       </set>
>       <set name="provincias" access="field" inverse="true"
>          cascade="all-delete-orphan" lazy="true" batch-size="5">
>          <key column="pais" />
>          <one-to-many class="Provincia"/>
>       </set>
>       
>       <property name="codAS400" type="string" not-null="false"/>
>    </class>
> </hibernate-mapping>

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