异常：java.lang.IllegalArgumentException: node to traverse cannot be null!

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异常提示信息：java.lang.IllegalArgumentException: node to traverse cannot be null!at org.hibernate.hql.ast.util.NodeTraverser.traverseDepthFirst(NodeTraverser.java:31)at org.hibernate.hql.ast.QueryTranslatorImpl.parse(QueryTranslatorImpl.java:254)at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:157)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.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:133)at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:112)at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1623)at com.kettas.myznt.dao.impl.IQuestionDaoHibernateImpl.queryByCommenflag(IQuestionDaoHibernateImpl.java:21)at com.kettas.myznt.struts.action.IndexAction.list(IndexAction.java:68)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)at java.lang.reflect.Method.invoke(Unknown Source)at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:270)at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:187)at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)at com.kettas.myznt.filter.EncodingFilter.doFilter(EncodingFilter.java:23)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)at java.lang.Thread.run(Unknown Source)

问题解决:

出现这种问题是因为HQL语句出现问题，引起内部查询对象为空，无法处理为空值引起的。解决方法，检查相对应的HQL语句，一般这样的错误都出现在HQL语句中。

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