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

[Victor S. (JIRA) <no...@at...>]

HqlSqlWalker throws NullPointerException with explicit joins and component mapping
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         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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