問題描述

Servlet + hibernate在高并發情況下部分線程會出現org.hibernate.SessionException: Session is closed!，但是在單線程情況下不會出現。

org.hibernate.SessionException: Session is closed! at org.hibernate.impl.AbstractSessionImpl.errorIfClosed(AbstractSessionImpl.java:72) at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1466) at sun.reflect.GeneratedMethodAccessor18.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:345) at com.sun.proxy.$Proxy6.beginTransaction(Unknown Source) at cn.com.thit.pis.usermanager.dao.BaseDAO.queryByMainKey(BaseDAO.java:136) at cn.com.thit.pis.usermanager.service.PhoneService.Register(PhoneService.java:137) at cn.com.thit.pis.usermanager.servlet.Register.doGet(Register.java:52) at javax.servlet.http.HttpServlet.service(HttpServlet.java:621) at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2430) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2419) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)

BaseDAO.java

public UserEntity queryByMainKey(long phone) {int retry = 0;entity = new UserEntity();session = factory.getCurrentSession();transaction = session.beginTransaction();while (retry++ < 3) { try {//if(!session.isOpen()) session.beginTransaction();Query q = session.createQuery('from UserEntity where phone=?');q.setLong(0, phone);if (q.list() == null || q.list().size() == 0) { return null;}entity.Clone((UserEntity) q.list().get(0));return entity; } catch (Exception e) {e.printStackTrace();continue; }}return null; }

問題解答

連接池配少了吧

解決了,將代碼改成如下即可

public UserEntity queryByMainKey(long phone) {int retry = 0;entity = new UserEntity();Session session = factory.getCurrentSession();Transaction transaction = session.beginTransaction();while (retry++ < 3) { try {//if(!session.isOpen()) session.beginTransaction();Query q = session.createQuery('from UserEntity where phone=?');q.setLong(0, phone);if (q.list() == null || q.list().size() == 0) { return null;}entity.Clone((UserEntity) q.list().get(0));return entity; } catch (Exception e) {e.printStackTrace();continue; }}return null; }