node to traverse cannot be null!

于 2018-05-26 18:21:05 发布
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本文链接：https://blog.youkuaiyun.com/v_nbsp/article/details/80463940
本文分析了一个关于Hibernate HQL查询出现的语法错误，并详细解释了如何从异常堆栈中定位问题所在，最终发现是因为拼写错误导致的问题。

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line 1:1: unexpected token: form
at org.hibernate.hql.internal.antlr.HqlBaseParser.statement(HqlBaseParser.java:169)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.parse(QueryTranslatorImpl.java:266)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:180)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:136)
at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:105)
at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:80)
at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:168)
at org.hibernate.internal.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:219)
at org.hibernate.internal.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:197)
at org.hibernate.internal.SessionImpl.createQuery(SessionImpl.java:1736)
at test.Test.main(Test.java:24)


Exception in thread "main" java.lang.IllegalArgumentException: node to traverse cannot be null!
at org.hibernate.hql.internal.ast.util.NodeTraverser.traverseDepthFirst(NodeTraverser.java:63)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.parse(QueryTranslatorImpl.java:272)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:180)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:136)
at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:105)
at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:80)
at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:168)
at org.hibernate.internal.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:219)
at org.hibernate.internal.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:197)
at org.hibernate.internal.SessionImpl.createQuery(SessionImpl.java:1736)

at test.Test.main(Test.java:24)

package test;

import java.util.*;
import org.hibernate.*;
import org.util.*;
import org.model.Kcb;
import org.util.HibernateSessionFactory;

public class Test {
	public static void main(String args[]){
		//调用HibernateSessionFactory的getSession()方法穿件Session对象
		Session session=HibernateSessionFactory.getSession();
		//创建事务对象
		Transaction ts=session.beginTransaction();
		//创建POJO类对象
		Kcb kcb=new Kcb();
		kcb.setKch("12");
		kcb.setKcm("java");
		kcb.setKxxq(new Short((short)5));
		kcb.setXf(1);
		kcb.setXs(2);
		session.save(kcb);
		ts.commit();
		Query query=session.createQuery("form Kcb where kch=198");
		List list=query.list();
		Kcb kc=(Kcb) list.get(0);
		HibernateSessionFactory.closeSession();
	}
}

原因:from写成了form

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