在使用SSH框架开发过程，使用hibernate框架提供的工具类实现与数据库数据交互，在执行cmd操作时，如果出现以下异常：

org.hibernate.hql.ast.QuerySyntaxException: xxx is not mapped [from xxx] 或者

nested exception is org.hibernate.hql.internal.ast.QuerySyntaxException

详细异常信息

 

21:08:31,951 ERROR DefaultDispatcherErrorHandler:42 - Exception occurred during processing request: Customer is not mapped [from Customer]; nested exception is org.hibernate.hql.internal.ast.QuerySyntaxException: Customer is not mapped [from Customer]
org.springframework.orm.hibernate5.HibernateQueryException: Customer is not mapped [from Customer]; nested exception is org.hibernate.hql.internal.ast.QuerySyntaxException: Customer is not mapped [from Customer]
    at org.springframework.orm.hibernate5.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:176)
    at org.springframework.orm.hibernate5.HibernateTemplate.doExecute(HibernateTemplate.java:344)
    at org.springframework.orm.hibernate5.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:309)
    at org.springframework.orm.hibernate5.HibernateTemplate.find(HibernateTemplate.java:863)
    at cn.itheima.ssh_exem.dao.impl.CustomerDaoImpl.findAllCustomer(CustomerDaoImpl.java:26)
    at cn.itheima.ssh_exem.service.impl.CustomerServiceImpl.findAllCustomer(CustomerServiceImpl.java:22)
    at cn.itheima.ssh_exem.action.CustomerAction.findCustomer(CustomerAction.java:38)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:870)
    at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1293)
    at ognl.ObjectMethodAccessor.callMethod(ObjectMethodAccessor.java:68)
    at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethodWithDebugInfo(XWorkMethodAccessor.java:117)
    at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethod(XWorkMethodAccessor.java:108)
    at ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1369)
    at ognl.ASTMethod.getValueBody(ASTMethod.java:90)
    at ognl.SimpleNode.eva luateGetValueBody(SimpleNode.java:212)
    at ognl.SimpleNode.getValue(SimpleNode.java:258)
    at ognl.Ognl.getValue(Ognl.java:494)
    at ognl.Ognl.getValue(Ognl.java:458)
    at com.opensymphony.xwork2.ognl.OgnlUtil$2.execute(OgnlUtil.java:309)
    at com.opensymphony.xwork2.ognl.OgnlUtil.compileAndExecute(OgnlUtil.java:340)
    at com.opensymphony.xwork2.ognl.OgnlUtil.getValue(OgnlUtil.java:307)
    at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:423)
    at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:287)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:250)
    at org.apache.struts2.interceptor.DeprecationInterceptor.intercept(DeprecationInterceptor.java:41)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation