我一直在努力解决这个问题。我有一个使用Struts2，spring和Hibernate的基于Web的应用程序。我使用Spring将struts动作和业务以及dao层连接在一起。 我正在使用JMeter加载测试应用程序。当我模拟1个用户反复发送get请求时，该应用程序运行良好，没有问题。但是当我添加几个用户时，一段时间后我收到以下错误：
Caused by: org.hibernate.exception.GenericJDBCException: Cannot open connection
at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:140)
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:128)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:52)
at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:449)
at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167)
at org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:160)
at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:81)
at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1473)
at org.springframework.orm.hibernate3.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:510)
... 104 more
Caused by: java.sql.SQLException: Listener refused the connection with the following error:
ORA-12519, TNS:no appropriate service handler found
The Connection descriptor used by the client was:
192.168.1.118:1521:BAADB
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:261)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:387)
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:414)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:165)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:35)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:801)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:154)
at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriverManager(DriverManagerDataSource.java:173)
at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriver(DriverManagerDataSource.java:164)
at org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnectionFromDriver(AbstractDriverBasedDataSource.java:149)
at org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnection(AbstractDriverBasedDataSource.java:119)
at org.springframework.orm.hibernate3.LocalDataSourceConnectionProvider.getConnection(LocalDataSourceConnectionProvider.java:81)
at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:446)
... 109 more
所以，我认为它是连接泄漏，但是当我模拟单个用户不断发送请求时，我不应该得到相同的错误（唯一的区别是，我会稍后得到错误）。在执行任何dao请求之前，我启用了Hibernate stats来检查打开会话的数量。处理完请求后，所有会话都将关闭。我正在使用OpenSessionInViewFilter，因此每个请求都有一个会话。
以下是所有文件 web.xml中：
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
"http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">
<web-app>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
/WEB-INF/applicationContext-security.xml
/WEB-INF/spring-database.xml
/WEB-INF/application-action.xml
/WEB-INF/newbeans.xml
</param-value>
</context-param>
<filter> <!-- Get spring to keep the session open for the whole request, so Hibernates lazy loads work -->
<filter-name>openSessionInViewFilter</filter-name>
<filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>openSessionInViewFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter>
<filter-name>springSecurityFilterChain</filter-name>
<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
<filter-mapping>
<filter-name>springSecurityFilterChain</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- - Loads the root application context of this web app at startup. -
The application context is then available via - WebApplicationContextUtils.getWebApplicationContext(servletContext). -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<listener>
<listener-class>
net.sf.navigator.menu.MenuContextListener</listener-class>
</listener>
<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>/WEB-INF/classes/log4j.properties</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
Spring和Hibernate文件
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
<tx:annotation-driven/>
<bean id="myDataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="oracle.jdbc.driver.OracleDriver" />
<property name="url" value="jdbc:oracle:thin:@192.168.1.118:1521:BAADB" />
<property name="username" value="htwork" />
<property name="password" value="*****" />
</bean>
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" ref="myDataSource" />
<property name="annotatedClasses">
<list>
<value>com.tda.ht.bean.SerialNumbers</value>
<value>com.tda.ht.bean.Bunos</value>
<value>com.tda.ht.bean.Tms</value>
<value>com.tda.ht.bean.Custodian</value>
<value>com.tda.ht.bean.CMISConfEntry</value>
<value>com.tda.ht.bean.HeloTrackCurrentBunoConf</value>
<value>com.tda.ht.bean.RepairBean</value>
<value>com.tda.ht.bean.TDIncorporation</value>
<value>com.tda.ht.bean.Miscellaneous</value>
<value>com.tda.ht.bean.Inspection</value>
<value>com.tda.ht.bean.HTComponentHistory</value>
<value>com.tda.ht.bean.Component</value>
<value>com.tda.baa.dao.TransferRequest</value>
<value>com.tda.baa.dao.UsersTable</value>
<value>com.tda.baa.dao.UserRoles</value>
<value>com.tda.ht.bean.EHRCurrentBunoConf</value>
<value>com.tda.ht.bean.SRCCurrentBunoConf</value>
<value>com.tda.ht.bean.ASRCurrentBunoConf</value>
<value>com.tda.ht.bean.ASRSubCurrentBunoConf</value>
<value>com.tda.ht.bean.ASRTree</value>
<value>com.tda.ht.bean.PMICTree</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.OracleDialect</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.generate_statistics">true</prop>
<prop key="hibernate.c3p0.min_size">5</prop>
<prop key="hibernate.c3p0.max_size">20</prop>
<prop key="hibernate.c3p0.timeout">300</prop>
<prop key="hibernate.c3p0.max_statements">50</prop>
<prop key="hibernate.c3p0.idle_test_period">3000</prop>
</props>
</property>
</bean>
<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
<bean id="componentDAO" class="com.tda.ht.dao.component.ComponentDAOImpl">
<property name="sessionFactory" ref="sessionFactory"></property>
</bean>
<bean id="componentBusiness" class="com.tda.ht.business.component.ComponentBusinessImpl">
<property name="iCompDAO" ref="componentDAO"></property>
</bean>
</beans>
请求componentBusiness的Action方法调用 - 由spring
管理public String displayHeader() {
Component c = componentBusiness.getComponentByPartNumber(partNumber);
return SUCCESS;
}
业务层
package com.tda.ht.business.component;
import java.util.List;
import org.springframework.transaction.annotation.Transactional;
import com.tda.ht.bean.Component;
import com.tda.ht.dao.component.IComponentDAO;
public class ComponentBusinessImpl implements IComponentBusiness {
private IComponentDAO iCompDAO;
//service layer method, transactions handled by spring
@Transactional(readOnly = true)
public Component getComponentByPartNumber(String partNumber) {
// TODO Auto-generated method stub
return iCompDAO.getComponentByPartNumber(partNumber);
}
}
DAO图层
public class ComponentDAOImpl implements IComponentDAO {
SessionFactory sessionFactory;
protected static org.apache.log4j.Logger log = Logger
.getLogger(ComponentDAOImpl.class);
//dao method called from service layer
@Override
public Component getComponentByPartNumber(String partNumber) {
String[] arguments = { partNumber };
long open = sessionFactory.getStatistics().getSessionOpenCount();
long close = sessionFactory.getStatistics().getSessionCloseCount();
log.error("Open " + open + " Close " + close);
Session s = sessionFactory.getCurrentSession();
log.error(" SESSION IS " + s.hashCode());
try {
Query q = s.createQuery("Select entry from Component as entry where entry.partNumber = ?");
q.setParameter(0, partNumber);
List<Component> list = q.list();
if (list.size() > 0)
return list.get(0);
return null;
}catch (Exception e) {
e.printStackTrace();
}finally {
//s.close();
}
return null;
}
}
在dao图层中，我收集有关打开和关闭会话的统计信息，因为我模拟了4个用户，所以差异从不超过4。看起来所有会话都被关闭了。处理请求时。如果我不使用spring并使用我自己的SessionFactory自己管理Hibernate，打开和关闭会话，一切正常并且没有错误。 我很困惑，因为我没有看到任何Sessions被泄露，任何指针都将非常感激。
答案 0 :(得分：3)
DriverManagerDataSource并不意味着在生产中使用，在生产中你想要使用连接池，DriverManagerDataSource不是连接池，我建议使用像Tomcat JDBC或Commons DBCP作为连接池。
您的hibernate.c3p0设置无用，因为您正在使用Spring配置和注入数据源，因此会忽略这些属性。
最后你DAO代码（可能）有缺陷，你不应该抓住并吞下Exception，因为这可能会破坏正确的tx管理。
如果您希望Log4j正确初始化，则应在Log4jConfigListener之前配置ContextLoaderListener最终的，无关的提示。虽然我怀疑你需要它，因为log4j.xml在你的类路径上，所以可能Log4J已经初始化了。