[hibernate-issues] [Hibernate-JIRA] Created: (HHH-4969) NullPointerException in FromClause.findIntendedAliasedFromElementBasedOnCrazyJPARequirements due to null alias map key

[Jürgen (JIRA)]

NullPointerException in FromClause.findIntendedAliasedFromElementBasedOnCrazyJPARequirements due to null alias map key
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                 Key: HHH-4969
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-4969
             Project: Hibernate Core
          Issue Type: Bug
          Components: core
    Affects Versions: 3.2.4.sp1
         Environment: Java version: 1.6.0_16,Sun Microsystems Inc.
Java VM: Java HotSpot(TM) 64-Bit Server VM 14.2-b01,Sun Microsystems Inc.
OS-System: Linux 2.6.25.14-69.fc8,amd64
Hibernate 3.2.4.sp1
JBosss-4.2.3.GA
DB2 v8 / JDBC Driver v4.7.85 
            Reporter: Jürgen


Got a NullPointerException in {{org.hibernate.hql.ast.tree.FromClause.findIntendedAliasedFromElementBasedOnCrazyJPARequirements(String)}} due to fromElementByClassAlias Map key being null.

Only for certain HQL query, along the lines of:
{code}
SELECT c FROM C c, IN(c.t) t, IN(c.k.x) x WHERE
c.k.u = 'K' AND
t.end >= CURRENT_DATE
{code}

Removing {{IN(c.k.x) x}} or {{c.k.u = 'K'}} will not result in a NullPointerException, most likely due to no null alias key put into the map.

specifiedAlias param was "CURRENT_DATE" when findIntendedAliasedFromElementBasedOnCrazyJPARequirements was called.

{code}
	private FromElement findIntendedAliasedFromElementBasedOnCrazyJPARequirements(String specifiedAlias) {
...
			if ( alias.equalsIgnoreCase( specifiedAlias ) ) { // alias can be null here
..
	}
{code}

{code}
java.lang.NullPointerException
        at org.hibernate.hql.ast.tree.FromClause.findIntendedAliasedFromElementBasedOnCrazyJPARequirements(FromClause.java:120)
        at org.hibernate.hql.ast.tree.FromClause.containsClassAlias(FromClause.java:247)
        at org.hibernate.hql.ast.tree.FromClause.isFromElementAlias(FromClause.java:135)
        at org.hibernate.hql.ast.HqlSqlWalker.isNonQualifiedPropertyRef(HqlSqlWalker.java:467)
        at org.hibernate.hql.antlr.HqlSqlBaseWalker.addrExpr(HqlSqlBaseWalker.java:4382)
        at org.hibernate.hql.antlr.HqlSqlBaseWalker.expr(HqlSqlBaseWalker.java:1212)
        at org.hibernate.hql.antlr.HqlSqlBaseWalker.exprOrSubquery(HqlSqlBaseWalker.java:4041)
        at org.hibernate.hql.antlr.HqlSqlBaseWalker.comparisonExpr(HqlSqlBaseWalker.java:3648)
        at org.hibernate.hql.antlr.HqlSqlBaseWalker.logicalExpr(HqlSqlBaseWalker.java:1762)
        at org.hibernate.hql.antlr.HqlSqlBaseWalker.logicalExpr(HqlSqlBaseWalker.java:1690)
        at org.hibernate.hql.antlr.HqlSqlBaseWalker.logicalExpr(HqlSqlBaseWalker.java:1687)
        at org.hibernate.hql.antlr.HqlSqlBaseWalker.logicalExpr(HqlSqlBaseWalker.java:1687)
        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: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.SessionFactoryImpl.checkNamedQueries(SessionFactoryImpl.java:402)
        at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:352)
        at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1294)
        at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:713)
        at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:127)
        at org.jboss.ejb3.entity.PersistenceUnitDeployment.start(PersistenceUnitDeployment.java:246)
        at sun.reflect.GeneratedMethodAccessor622.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.jboss.ejb3.ServiceDelegateWrapper.startService(ServiceDelegateWrapper.java:103)
        at org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanSupport.java:289)
        at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:245)
        at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
        at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
        at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
        at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
        at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
        at org.jboss.system.server.jmx.LazyMBeanServer.invoke(LazyMBeanServer.java:291)
        at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:978)
        at $Proxy0.start(Unknown Source)
        at org.jboss.system.ServiceController.start(ServiceController.java:417)
{code}

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