MySQLNonTransientConnectionException：連接太多

我的Spring-MVC應用程序在瀏覽站點時有時會崩潰，我從日誌中獲得的錯誤消息如下。我完全不知道是什麼原因造成的，我會非常感謝任何能夠讓我朝着正確方向發展的提示。MySQLNonTransientConnectionException：連接太多

SEVERE: Servlet.service() for servlet HS threw exception 
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Data source rejected establishment of connection, message from server: "Too many connections" 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) 
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) 
    at java.lang.reflect.Constructor.newInstance(Constructor.java:532) 
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:407) 
    at com.mysql.jdbc.Util.getInstance(Util.java:382) 
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1013) 
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:987) 
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:982) 
    at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1116) 
    at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2338) 
    at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2371) 
    at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2163) 
    at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:794) 
    at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47) 
    at sun.reflect.GeneratedConstructorAccessor56.newInstance(Unknown Source) 
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) 
    at java.lang.reflect.Constructor.newInstance(Constructor.java:532) 
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:407) 
    at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:378) 
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305) 
    at org.apache.commons.dbcp.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:38) 
    at org.apache.commons.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:582) 
    at org.apache.commons.dbcp.BasicDataSource.validateConnectionFactory(BasicDataSource.java:1556) 
    at org.apache.commons.dbcp.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:1545) 
    at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1388) 
    at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044) 
    at org.springframework.orm.hibernate3.LocalDataSourceConnectionProvider.getConnection(LocalDataSourceConnectionProvider.java:81) 
    at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:446) 
    at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167) 
    at org.hibernate.jdbc.AbstractBatcher.prepareQueryStatement(AbstractBatcher.java:161) 
    at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1577) 
    at org.hibernate.loader.Loader.doQuery(Loader.java:696) 
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259) 
    at org.hibernate.loader.Loader.doList(Loader.java:2232) 
    at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2129) 
    at org.hibernate.loader.Loader.list(Loader.java:2124) 
    at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:401) 
    at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:363) 
    at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196) 
    at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1149) 
    at org.hibernate.impl.QueryImpl.list(QueryImpl.java:102) 
    at org.springframework.orm.hibernate3.HibernateTemplate$30.doInHibernate(HibernateTemplate.java:921) 
    at org.springframework.orm.hibernate3.HibernateTemplate$30.doInHibernate(HibernateTemplate.java:1) 
    at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:406) 
    at org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:374) 
    at org.springframework.orm.hibernate3.HibernateTemplate.find(HibernateTemplate.java:912) 
    at org.springframework.orm.hibernate3.HibernateTemplate.find(HibernateTemplate.java:904) 
    at se.hs.daos.UserDAOImpl.findByName(UserDAOImpl.java:42) 
    at se.hs.controllers.LoginController.checkPassword(LoginController.java:20) 
    at se.hs.pagecontrollers.LoginPageController.submitForm(LoginPageController.java:26) 
    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:616) 
    at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176) 
    at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426) 
    at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414) 
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790) 
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719) 
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644) 
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
    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:191) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) 
    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:298) 
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859) 
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588) 
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) 
    at java.lang.Thread.run(Thread.java:636)

什麼我UserDAOImpl中的樣子：

package se.hs.daos; 

import java.util.List; 

import org.hibernate.SessionFactory; 
import org.springframework.context.ApplicationContext; 
import org.springframework.context.support.ClassPathXmlApplicationContext; 
import org.springframework.orm.hibernate3.HibernateTemplate; 
import org.springframework.orm.hibernate3.support.HibernateDaoSupport; 

import se.hs.models.User; 

public class UserDAOImpl extends HibernateDaoSupport implements UserDAO { 

    private ApplicationContext context = new ClassPathXmlApplicationContext(
      "classpath*:applicationContext.xml"); 
    private SessionFactory sessionFactory = (SessionFactory) context 
      .getBean("mySessionFactory"); 
    private HibernateTemplate hibernateTemplate = new HibernateTemplate(
      sessionFactory, true); 

    public void saveUser(User user) { 
     hibernateTemplate.save(user); 
    } 

    public User getUserById(Integer id) { 

     User userFromDB = hibernateTemplate.get(User.class, id); 
     return userFromDB; 
    } 

    public void removeUser(User user) { 
     hibernateTemplate.delete(user); 
    } 

    public User findByName(String name) { 

     String query = "SELECT u.userId FROM User u WHERE u.userName='" + name 
       + "'"; 

     @SuppressWarnings("unchecked") 
     List<Integer> list = hibernateTemplate.find(query); 

     User userFromDB = null; 

     if (list.size() > 0) { 
      userFromDB = getUserById(list.get(0)); 
     } 

     return userFromDB; 
    } 

}

UPDATE：

exception 

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.jdbc.UncategorizedSQLException: Hibernate operation: Cannot release connection; uncategorized SQLException for SQL [???]; SQL state [null]; error code [0]; Already closed.; nested exception is java.sql.SQLException: Already closed. 
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:656) 
    org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:637) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
root cause 

org.springframework.jdbc.UncategorizedSQLException: Hibernate operation: Cannot release connection; uncategorized SQLException for SQL [???]; SQL state [null]; error code [0]; Already closed.; nested exception is java.sql.SQLException: Already closed. 
    org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:83) 
    org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:80) 
    org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:80) 
    org.springframework.orm.hibernate3.HibernateAccessor.convertJdbcAccessException(HibernateAccessor.java:424) 
    org.springframework.orm.hibernate3.HibernateAccessor.convertHibernateAccessException(HibernateAccessor.java:410) 
    org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:411) 
    org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:374) 
    org.springframework.orm.hibernate3.HibernateTemplate.save(HibernateTemplate.java:683) 
    se.hsr.daos.InfoTextDAOImpl.saveInfoText(InfoTextDAOImpl.java:26) 
    se.hsr.controllers.InfoTextController.saveInfoText(InfoTextController.java:31) 
    se.hsr.pagecontrollers.InfoTextPageController.submitForm(InfoTextPageController.java:35) 
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    java.lang.reflect.Method.invoke(Method.java:616) 
    org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176) 
    org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426) 
    org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414) 
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790) 
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719) 
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644) 
    org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:637) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
root cause 

java.sql.SQLException: Already closed. 
    org.apache.commons.dbcp.PoolableConnection.close(PoolableConnection.java:114) 
    org.apache.commons.dbcp.PoolingDataSource$PoolGuardConnectionWrapper.close(PoolingDataSource.java:191) 
    org.springframework.orm.hibernate3.LocalDataSourceConnectionProvider.closeConnection(LocalDataSourceConnectionProvider.java:95) 
    org.hibernate.jdbc.ConnectionManager.closeConnection(ConnectionManager.java:474) 
    org.hibernate.jdbc.ConnectionManager.aggressiveRelease(ConnectionManager.java:429) 
    org.hibernate.jdbc.ConnectionManager.afterStatement(ConnectionManager.java:304) 
    org.hibernate.jdbc.AbstractBatcher.closePreparedStatement(AbstractBatcher.java:572) 
    org.hibernate.jdbc.AbstractBatcher.closeStatement(AbstractBatcher.java:291) 
    org.hibernate.id.insert.AbstractReturningDelegate.releaseStatement(AbstractReturningDelegate.java:82) 
    org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:60) 
    org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2176) 
    org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2656) 
    org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:71) 
    org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279) 
    org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:321) 
    org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:204) 
    org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:130) 
    org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210) 
    org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:56) 
    org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195) 
    org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:50) 
    org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93) 
    org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:563) 
    org.hibernate.impl.SessionImpl.save(SessionImpl.java:551) 
    org.hibernate.impl.SessionImpl.save(SessionImpl.java:547) 
    org.springframework.orm.hibernate3.HibernateTemplate$12.doInHibernate(HibernateTemplate.java:686) 
    org.springframework.orm.hibernate3.HibernateTemplate$12.doInHibernate(HibernateTemplate.java:1) 
    org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:406) 
    org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:374) 
    org.springframework.orm.hibernate3.HibernateTemplate.save(HibernateTemplate.java:683) 
    se.hsr.daos.InfoTextDAOImpl.saveInfoText(InfoTextDAOImpl.java:26) 
    se.hsr.controllers.InfoTextController.saveInfoText(InfoTextController.java:31) 
    se.hsr.pagecontrollers.InfoTextPageController.submitForm(InfoTextPageController.java:35) 
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    java.lang.reflect.Method.invoke(Method.java:616) 
    org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176) 
    org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426) 
    org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414) 
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790) 
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719) 
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644) 
    org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:637) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

來源

2011-03-11 Soroush Hakami

這意味着DB SQL服務器正在運行的連接。服務器有一個配置參數，用於指定允許的最大連接數。

這通常表示連接未關閉。你是否在代碼中從Hibernate請求連接對象？

短期內，您可以增加最大連接數，直到解決此問題。

來源

2011-03-11 16:46:13

感謝您的回覆連接。我做了你的建議，並將maxiumum連接的數量更改爲2000.現在發生另一個錯誤：UncategorizedSQLException：Hibernate操作：無法釋放連接（如果完整的堆棧跟蹤相關，請告訴我，我會上傳它）。相信增加最大連接數並不是問題所在，任何想法可能是什麼？ –

是，堆棧跟蹤將help.You也可以嘗試添加該冬眠的配置： hibernate.connection.release_mode = AFTER_STATEMENT 這是不是一個永久性的解決方案，但如果這能幫助我們知道這是一個配置問題。 –

如果增加連接數可能會修復它，但將來仍有可能發生這種相同的異常。

確保您已在數據庫配置中定義<property name="maxIdle" value="1" />xml文件。當我定義了<property name="maxIdle" value="1" />它解決了我的問題時，我也遇到了同樣的問題。

<bean id="myDataSource" class="org.apache.commons.dbcp.BasicDataSource" 
     destroy-method="close"> 
     <property name="driverClassName" value="com.mysql.jdbc.Driver" /> 
     <property name="url" value="jdbc:mysql://localhost/crm" /> 
     <property name="username" value="root" /> 
     <property name="password" value="root" /> 
     <property name="initialSize" value="10" /> 
     <property name="maxActive" value="15" /> 
     <property name="maxWait" value="5000" /> 
     <property name="maxIdle" value="1" /> 

    </bean>

來源

2013-02-15 08:19:58 Visruth

在上面的標籤這一行是很重要的

<property name="maxIdle" value="1" />

將工作，因爲這將只允許一個用於AJAX或DB請求

來源

2013-03-14 18:12:53

MySQLNonTransientConnectionException：連接太多

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