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

報錯信息：

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.cqa.core.common.dao.EntityDaoImpl.findPage(EntityDaoImpl.java:154)
 at com.cqa.service.vip.znx.ZnxServiceImpl.findMemberMail(ZnxServiceImpl.java:10)
 at com.cqa.service.vip.znx.ZnxServiceImpl$$FastClassByCGLIB$$b3302b8d.invoke(<generated>)
 at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
 at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:714)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:162)
 at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:107)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
 at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:652)
 at com.cqa.service.vip.znx.ZnxServiceImpl$$EnhancerByCGLIB$$6bde40b5.findMemberMail(<generated>)
 at com.cqa.action.vip.znx.VipZnxAction.loadMemberMail(VipZnxAction.java:41)
 at com.cqa.action.vip.znx.VipZnxAction.show(VipZnxAction.java:23)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)

解決方法:

      通常此類錯誤都是由於HQL語句寫的不正確,例如from寫成了form,或者set A = 1 and B = 2,其中set不同字段用逗號","分離而不是用and.總之仔細檢查HQL語句,看看有沒有語法錯誤即可.

轉載：http://hi.baidu.com/a729812804/item/69b8423d7512c109cfb9fe2c