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我使用Hibernate 4和MySQL爲我當前的網站，我試圖保持刷新頁面很多時間在2瀏覽器的選項卡中，服務器跟蹤錯誤日誌：什麼可能導致「太多的連接」休眠4
ERROR: Data source rejected establishment of connection, message from server: "Too many connections"
org.hibernate.exception.JDBCConnectionException: Could not open connection
at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:68)
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:110)
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:304)
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.getConnection(LogicalConnectionImpl.java:169)
at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.doBegin(JdbcTransaction.java:67)
at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.begin(AbstractTransactionImpl.java:160)
at hibernate.dao.StockDao.getWarehouseInStock(StockDao.java:132)
at Utils.Common.updateStockHistorical(Common.java:501)
at Controller.StockServlet.processRequest(StockServlet.java:67)
at Controller.StockServlet.doPost(StockServlet.java:116)
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 Controller.ServletFilter.doFilter(ServletFilter.java:134)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
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:103)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:879)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:600)
at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1703)
at java.lang.Thread.run(Thread.java:722)
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Data source rejected establishment of connection, message from server: "Too many connections"
at sun.reflect.GeneratedConstructorAccessor70.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.Util.getInstance(Util.java:386)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1014)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:988)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:974)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1104)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2412)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2445)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2230)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:813)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
at sun.reflect.GeneratedConstructorAccessor62.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:399)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:334)
at java.sql.DriverManager.getConnection(DriverManager.java:579)
at java.sql.DriverManager.getConnection(DriverManager.java:190)
at org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl.getConnection(DriverManagerConnectionProviderImpl.java:173)
at org.hibernate.internal.AbstractSessionImpl$NonContextualJdbcConnectionAccess.obtainConnection(AbstractSessionImpl.java:279)
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:297)
... 24 more
，這是我對Hibernate的配置：
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/wstrader2?characterEncoding=UTF-8</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">root</property>
<property name="hibernate.current_session_context_class">jta</property>
<mapping resource="hibernate/dto/Warehouse.hbm.xml"/>
<mapping resource="hibernate/dto/Exchange.hbm.xml"/>
<mapping resource="hibernate/dto/Packing.hbm.xml"/>
<mapping resource="hibernate/dto/GradeMaster.hbm.xml"/>
<mapping resource="hibernate/dto/MarketFobDiff.hbm.xml"/>
<mapping resource="hibernate/dto/Arbitration.hbm.xml"/>
<mapping resource="hibernate/dto/Quality.hbm.xml"/>
<mapping resource="hibernate/dto/Region.hbm.xml"/>
<mapping resource="hibernate/dto/City.hbm.xml"/>
<mapping resource="hibernate/dto/Contract.hbm.xml"/>
<mapping resource="hibernate/dto/HistoricalBasis.hbm.xml"/>
<mapping resource="hibernate/dto/Country.hbm.xml"/>
<mapping resource="hibernate/dto/Origin.hbm.xml"/>
<mapping resource="hibernate/dto/WarehouseReceipt.hbm.xml"/>
<mapping resource="hibernate/dto/DailyBasis.hbm.xml"/>
<mapping resource="hibernate/dto/User.hbm.xml"/>
<mapping resource="hibernate/dto/Movement.hbm.xml"/>
<mapping resource="hibernate/dto/PaymentTerm.hbm.xml"/>
<mapping resource="hibernate/dto/ContractTerm.hbm.xml"/>
<mapping resource="hibernate/dto/CompanyMaster.hbm.xml"/>
<mapping resource="hibernate/dto/ProcessingOrder.hbm.xml"/>
<mapping resource="hibernate/dto/Stock.hbm.xml"/>
<mapping resource="hibernate/dto/HistoricalStock.hbm.xml"/>
<mapping resource="hibernate/dto/Menu.hbm.xml"/>
<mapping resource="hibernate/dto/Authorization.hbm.xml"/>
<mapping resource="hibernate/dto/Page.hbm.xml"/>
<mapping resource="hibernate/dto/ContractPriceFixation.hbm.xml"/>
<mapping resource="hibernate/dto/FuturesContract.hbm.xml"/>
<mapping resource="hibernate/dto/FutureCloseOut.hbm.xml"/>
<mapping resource="hibernate/dto/Currency.hbm.xml"/>
<mapping resource="hibernate/dto/FuturesContractArchive.hbm.xml"/>
<mapping resource="hibernate/dto/FutureCloseOutArchive.hbm.xml"/>
<mapping resource="hibernate/dto/ScreenMaster.hbm.xml"/>
<mapping resource="hibernate/dto/QualityMaster.hbm.xml"/>
</session-factory>
</hibernate-configuration>
這裏是我的HibernateUtil.java：
public class HibernateUtil {
private static final SessionFactory ourSessionFactory;
private static ServiceRegistry serviceRegistry;
private static Configuration configuration = new Configuration().configure();
static {
try {
serviceRegistry = new ServiceRegistryBuilder().applySettings(
configuration.getProperties()).buildServiceRegistry();
ourSessionFactory = configuration.buildSessionFactory(serviceRegistry);
} catch (Throwable ex) {
throw new ExceptionInInitializerError(ex);
}
}
public static Session getSession() throws HibernateException {
return ourSessionFactory.openSession();
}
}
有人能找出原因，或告訴我的情況會導致錯誤"Too many connection"和org.hibernate.exception.JDBCConnectionException: Could not open connection 我試圖找到相關的主題，但仍然沒有找到答案我的問題
感謝您閱讀這個話題。
修訂： 我的樣本Dao.java：
public class CityDAO {
private Session session = null;
public CityDAO() {
session = HibernateUtil.getSession();
}
public ArrayList<City> getAllCities() {
try {
session.getTransaction().begin();
Criteria crit = session.createCriteria(City.class);
ArrayList<City> cities = (ArrayList<City>)crit.list();
session.flush();
session.getTransaction().commit();
return cities;
} catch (Exception e) {
if (session.getTransaction().isActive()) {
session.getTransaction().rollback();
}
e.printStackTrace();
}
return null;
}
public City getCityById(int id){
try {
session.getTransaction().begin();
Criteria crit = session.createCriteria(City.class);
crit.add(Restrictions.eq("id", id));
City city = (City)crit.uniqueResult();
session.flush();
session.getTransaction().commit();
return city;
} catch (Exception e) {
if (session.getTransaction().isActive()) {
session.getTransaction().rollback();
}
e.printStackTrace();
}
return null;
}
}
嘗試建立一個C3P0配置：http://docs.jboss.org/hibernate/orm/3.3/reference/en/html/session-configuration.html – PeterMmm 2013-04-11 09:35:13
每個DB都有其自己的連接限制。在這種情況下，這正是這種限制。看起來，您的連接池設置不正確：它必須具有最大連接數
Andremoniy
2013-04-11 09:38:20
您應該在生產環境中使用連接池，如PeterMmm所說。以及如何管理事務以及何時關閉休眠會話？ – user1516873 2013-04-11 09:42:39