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org.hibernate.InstantiationException: Cannot instantiate abstract class or interface: com.ssh.po.Operator at org.hibernate.tuple.PojoInstantiator.instantiate(PojoInstantiator.java:78) at org.hibernate.tuple.PojoInstantiator.instantiate(PojoInstantiator.java:100) at org.hibernate.tuple.entity.AbstractEntityTuplizer.instantiate(AbstractEntityTuplizer.java:351) at org.hibernate.persister.entity.AbstractEntityPersister.instantiate(AbstractEntityPersister.java:3606) at org.hibernate.impl.SessionImpl.instantiate(SessionImpl.java:1275) at org.hibernate.impl.SessionImpl.instantiate(SessionImpl.java:1264) at org.hibernate.loader.Loader.instanceNotYetLoaded(Loader.java:1299) at org.hibernate.loader.Loader.getRow(Loader.java:1206) at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:580) at org.hibernate.loader.Loader.doQuery(Loader.java:701) at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236) at org.hibernate.loader.Loader.doList(Loader.java:2220) at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2104) at org.hibernate.loader.Loader.list(Loader.java:2099) at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:378) at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:338) at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:172) at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1121) at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79) at com.ssh.dao.impl.LoginDAOImpl.isOperator(LoginDAOImpl.java:40) at com.ssh.manager.impl.LoginManagerImpl.isOperator(LoginManagerImpl.java:24) at com.ssh.action.LoginAction.execute(LoginAction.java:51) at org.apache.struts.chain.commands.servlet.ExecuteAction.execute(ExecuteAction.java:58) at org.apache.struts.chain.commands.AbstractExecuteAction.execute(AbstractExecuteAction.java:67) at org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51) at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190) at org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:304) at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190) at org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913) at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462) at javax.servlet.http.HttpServlet.service(HttpServlet.java:710) 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 org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) 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:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Unknown Source)
org.hibernate.InstantiationException: Cannot instantiate abstract class or interface: com.ssh.po.Operator（实例化Operator的出错了）
说明下项目中的几个class或者interface:
(1)public abstract class Operator implements java.io.Serializable {...}
(2)public class OperatorImpl extends Operator implements java.io.Serializable{..}
最终需要instance的应该是OperatorImpl而不是Operator，故在操作数据库的SQL中应用OperatorImpl类。
程序修改代码由：
hql = "from Operator t where t.operatorName = ? ";
变为：
hql = "from OperatorImpl t where t.operatorName = ? ";
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