MySQLNonTransientConnectionException: Troppe connessioni

L'applicazione Spring-MVC a volte si arresta in modo anomalo durante la navigazione nel sito, il messaggio di errore che ho ottenuto dai log si trova di seguito. Non ho assolutamente idea di cosa stia causando questo e sarei molto grato per eventuali suggerimenti che mi porteranno nella giusta direzione.MySQLNonTransientConnectionException: Troppe connessioni

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)

Ciò che il mio UserDaoImpl assomiglia:

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)

fonte

2011-03-11 Soroush Hakami

Significa SQL Server DB è a corto di connessioni. Il server ha un parametro di configurazione che specifica in che modo le connessioni massime consentite.

Questo di solito indica che le connessioni non vengono chiuse. Stai richiedendo oggetti di connessione da Hibernate nel tuo codice?

A breve termine, è possibile aumentare le connessioni massime fino a quando questo problema non viene risolto.

fonte

2011-03-11 16:46:13

Grazie per la risposta. Ho fatto quello che mi hai suggerito e ho cambiato il numero di connessioni Maxiumum fino al 2000. Ora si verifica un altro errore: UncategorizedSQLException: operazione di ibernazione: impossibile rilasciare la connessione (se lo stacktrace completo è rilevante per favore dimmelo e lo caricherò.) Questo mi porta a Credi che aumentare il numero di connessioni massime non è dove si trova il problema, qualche idea di cosa potrebbe essere? –

Sì, analisi dello stack sarebbe help.You può anche provare ad aggiungere questo per ibernare configurazione: hibernate.connection.release_mode = after_statement questa non è una soluzione permanente, ma se questo aiuta noi sappiamo che questo è un problema di configurazione. –

Se si aumenta il numero di connessioni, è possibile risolverlo ma è comunque possibile che si verifichi questa stessa eccezione in futuro.

Assicurarsi di aver definito <property name="maxIdle" value="1" /> nella configurazione del database xml file. Inoltre ho avuto questo stesso problema quando ho definito <property name="maxIdle" value="1" /> risolto il mio problema.

<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>

fonte

2013-02-15 08:19:58 Visruth

nel tag di sopra di questa linea è importante

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

funzionerà, in quanto consentirà una sola connessione per l'AJAX o la richiesta DB

fonte

2013-03-14 18:12:53

MySQLNonTransientConnectionException: Troppe connessioni

risposta

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