[Hibernate-issues] [Hibernate-JIRA] Created: (HHH-1885) LA(0) is undefined

[Brian C. (JIRA) <no...@at...>]

LA(0) is undefined
------------------

         Key: HHH-1885
         URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1885
     Project: Hibernate3
        Type: Bug

  Components: query-hql  
    Versions: 3.1.2    
 Environment: Hibernate 3.1.2  Postgres 8.1.2
    Reporter: Brian Cox


method weakKeywords() in org.hibernate.hql.ast.HqlParser.java has:

if (LA(0) == FROM && t != IDENT && LA(2) == DOT) {
...
}

According to a posting on the antlr mailing list [see "LT(0) Specification" posted 1 July 2006],
LA(i) and LT(i) are defined only for i > 0. Examining the code supports this assertion.  Also these
methods are documented as "lookahead" not "lookbehind".  LT(0) can return NULL and then LA(0)
will throw a NullPointerException as shown:

java.lang.NullPointerException
	at antlr.TokenBuffer.LA(TokenBuffer.java:81)
	at antlr.LLkParser.LA(LLkParser.java:52)
	at org.hibernate.hql.ast.HqlParser.weakKeywords(HqlParser.java:296)
	at org.hibernate.hql.antlr.HqlBaseParser.negatedExpression(HqlBaseParser.java:2366)
	at org.hibernate.hql.antlr.HqlBaseParser.logicalAndExpression(HqlBaseParser.java:2331)
	at org.hibernate.hql.antlr.HqlBaseParser.logicalOrExpression(HqlBaseParser.java:2296)
	at org.hibernate.hql.antlr.HqlBaseParser.expression(HqlBaseParser.java:2082)
	at org.hibernate.hql.antlr.HqlBaseParser.compoundExpr(HqlBaseParser.java:2991)
	at org.hibernate.hql.antlr.HqlBaseParser.inList(HqlBaseParser.java:2858)
	at org.hibernate.hql.antlr.HqlBaseParser.relationalExpression(HqlBaseParser.java:2720)
	at org.hibernate.hql.antlr.HqlBaseParser.equalityExpression(HqlBaseParser.java:2449)
	at org.hibernate.hql.antlr.HqlBaseParser.negatedExpression(HqlBaseParser.java:2413)
	at org.hibernate.hql.antlr.HqlBaseParser.logicalAndExpression(HqlBaseParser.java:2331)
	at org.hibernate.hql.antlr.HqlBaseParser.logicalOrExpression(HqlBaseParser.java:2296)
	at org.hibernate.hql.antlr.HqlBaseParser.expression(HqlBaseParser.java:2082)
	at org.hibernate.hql.antlr.HqlBaseParser.logicalExpression(HqlBaseParser.java:1858)
	at org.hibernate.hql.antlr.HqlBaseParser.whereClause(HqlBaseParser.java:454)
	at org.hibernate.hql.antlr.HqlBaseParser.updateStatement(HqlBaseParser.java:224)
	at org.hibernate.hql.antlr.HqlBaseParser.statement(HqlBaseParser.java:142)
	at org.hibernate.hql.ast.QueryTranslatorImpl.parse(QueryTranslatorImpl.java:238)
	at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:155)
	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:134)
	at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:113)
	at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1602)
	at com.timestock.tess.util.DbUtils.saveUpdatedUsers(DbUtils.java:38)
	at com.timestock.tess.services.collectors.StatsCollector$StatisticsCollector.run(StatsCollector.java:602)
	at java.util.TimerThread.mainLoop(Timer.java:512)
	at java.util.TimerThread.run(Timer.java:462)



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