org.hibernate.hql.ast.QuerySyntaxException: unexpected token2008

来源：http://hi.baidu.com/liuspring/blog/item/3262938257ae9094f703a64e.html/cmtid/da766a8d723ec81db31bbaab

相当相当隐蔽的错误
今天周末，被头儿过来改bug
其中一个在hql查询的时候报org.hibernate.hql.ast.QuerySyntaxException: unexpected token: ApplyInfo near line 1, column 23这样的错误，貌似看起来hibernate不认识ApplyInfo这个映射持久类，但是这个类非常确定的是已经映射了，而且在别处用的非常正常。郁闷，找啊找
在网上找org.hibernate.hql.ast.QuerySyntaxException: unexpected token的错误有
1、持久类写错了，要不就是写成了数据库表名
2、hibernate3.0不支持select中嵌套查询，据说from中也不行，只支持where中嵌套查询，好像3.1支持了select中嵌套
3、sql语句中字段是用了保留关键字

然后就是我发现的这个隐蔽错误了
发现的from后的空格是一个全角的空格，半角 空格，全角　空格。距离比一样啊，原来就看出from后面的空格大了，还以为是两个空格呢。

隐蔽，太隐蔽了。

org.hibernate.hql.ast.QuerySyntaxException: unexpected token: ApplyInfo near line 1, column 23 [SELECT contCount　FROM ApplyInfo where applyId = (select applyId from com.capinfo.hibernate.person.pojo.AContinueInfo where id=25)]
    at org.hibernate.hql.ast.ErrorCounter.throwQueryException(ErrorCounter.java:59)
    at org.hibernate.hql.ast.QueryTranslatorImpl.parse(QueryTranslatorImpl.java:244)
    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.capinfo.zgbm.print.dao.PrintQueryDAO.getContinueCount(PrintQueryDAO.java:273)
    at com.capinfo.zgbm.print.action.PrintContinueCountAction.execute(PrintContinueCountAction.java:95)
    at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
    at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
    at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
    at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
    at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:225)
    at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:127)
    at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:283)
    at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
    at com.capinfo.util.LoginFilter.doFilter(LoginFilter.java:61)
    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
    at com.capinfo.util.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:67)
    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
    at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3212)
    at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
    at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
    at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:1983)
    at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:1890)
    at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1344)
    at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
    at weblogic.work.ExecuteThread.run(ExecuteThread.java:181)
Caused by: line 1:23: unexpected token: ApplyInfo
    at org.hibernate.hql.antlr.HqlBaseParser.identPrimary(HqlBaseParser.java:4021)
    at org.hibernate.hql.antlr.HqlBaseParser.primaryExpression(HqlBaseParser.java:861)
    at org.hibernate.hql.antlr.HqlBaseParser.atom(HqlBaseParser.java:3422)
    at org.hibernate.hql.antlr.HqlBaseParser.unaryExpression(HqlBaseParser.java:3200)
    at org.hibernate.hql.antlr.HqlBaseParser.multiplyExpression(HqlBaseParser.java:3082)
    at org.hibernate.hql.antlr.HqlBaseParser.additiveExpression(HqlBaseParser.java:2802)
    at org.hibernate.hql.antlr.HqlBaseParser.concatenation(HqlBaseParser.java:570)
    at org.hibernate.hql.antlr.HqlBaseParser.relationalExpression(HqlBaseParser.java:2586)
    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.aliasedExpression(HqlBaseParser.java:2249)
    at org.hibernate.hql.antlr.HqlBaseParser.selectedPropertiesList(HqlBaseParser.java:1455)
    at org.hibernate.hql.antlr.HqlBaseParser.selectClause(HqlBaseParser.java:1365)
    at org.hibernate.hql.antlr.HqlBaseParser.selectFrom(HqlBaseParser.java:1106)
    at org.hibernate.hql.antlr.HqlBaseParser.queryRule(HqlBaseParser.java:702)
    at org.hibernate.hql.antlr.HqlBaseParser.selectStatement(HqlBaseParser.java:296)
    at org.hibernate.hql.antlr.HqlBaseParser.statement(HqlBaseParser.java:159)
    at org.hibernate.hql.ast.QueryTranslatorImpl.parse(QueryTranslatorImpl.java:238)
    ... 33 more