org.hibernate.exception.JDBCConnectionException: Cannot open connection

Question

连接数据库MySql, 经常出现以下错误, 但网页一般刷新几次后,又连接上数据库,可正常显示了.
以前没有出现过这种情况, 我在自己的电脑上调试时, 也没出现. 我的数据库连接配置文件是:
WEB-INF/classes/hibernate.cfg.xml, c3p0的连接池, <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory name="kh_session">
         <!-- mysql connection -->
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> 
        <!--  jdbc:mysql://localhost/kh -->
        <property name="hibernate.connection.url">
            jdbc:mysql://www.070707zx.com/mydb 
        </property>  
        <property name="hibernate.connection.username">myname</property>
        <property name="hibernate.connection.password">mypassword</property>        
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
         
        <property name="show_sql">false</property>
        
        
         <!-- C3P0 Connection Pool -->  
         <property name="hibernate.connection.provider_class">
             org.hibernate.connection.C3P0ConnectionProvider
         </property>
        <property name="hibernate.c3p0.max_size">50</property>
        <property name="hibernate.c3p0.min_size">2</property>
        <property name="hibernate.c3p0.timeout">5000</property>
        <property name="hibernate.c3p0.max_statements">100</property>
        <property name="hibernate.c3p0.idle_test_period">3000</property>
        <property name="hibernate.c3p0.acquire_increment">2</property>
        <property name="hibernate.c3p0.maxIdleTime">1800</property >
        <property name="hibernate.c3p0.validate">true</property>
        <property name="hibernate.c3p0.preferredTestQuery">SELECT id FROM test WHERE id=1</property> 
       
        
        <mapping resource="kh3.hbm.xml" />
    </session-factory>
</hibernate-configuration>
-----------------------------------------------------------------------------下面是错误信息
--------------------------------------------------------------------------------
HTTP Status 500 - --------------------------------------------------------------------------------type Exception reportmessage descript_ion The server encountered an internal error () that prevented it from fulfilling this request.exception org.apache.jasper.JasperException: Cannot open connection
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:372)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
com.util.UrlFilter.doFilter(UrlFilter.java:64)
com.util.EncodingFilter.doFilter(EncodingFilter.java:114)
root cause org.hibernate.exception.JDBCConnectionException: Cannot open connection
org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:74)
org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:29)
org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:426)
org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:144)
org.hibernate.jdbc.AbstractBatcher.prepareQueryStatement(AbstractBatcher.java:139)
org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1547)
org.hibernate.loader.Loader.doQuery(Loader.java:673)
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
org.hibernate.loader.Loader.doList(Loader.java:2220)
org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2104)
org.hibernate.loader.Loader.list(Loader.java:2099)
org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:378)
org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:338)
org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:172)
org.hibernate.impl.SessionImpl.list(SessionImpl.java:1121)
org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
com.util.DBHelper.getQueryList(DBHelper.java:34)
com.mykh.YmcsHelper.getYmcs(YmcsHelper.java:29)
org.apache.jsp.index_jsp._jspService(index_jsp.java:89)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
com.util.UrlFilter.doFilter(UrlFilter.java:64)
com.util.EncodingFilter.doFilter(EncodingFilter.java:114)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.----------------------------------------------------------------------
请大家帮我看看

Answer 1

确定jdbc:mysql://www.070707zx.com/mydb这样可以访问吗?有没有这个权限呢?

Answer 2

好像MySql的URL不是这样子写的 Class.forName("org.gjt.mm.mysql.Driver").newInstance(); 
String url ="jdbc: mysql://localhost/softforum?user=soft&password=soft1234&useUnicode=true&characterEncoding=8859_1" 
//testDB为你的数据库名 
Connection conn= DriverManager.getConnection(url); www.070707zx.com换成IP试试。mydb是你的数据库名称吗？？

Answer 3

我用的驱动版本是mysql-connector-java-5.0.7, 应该是最新的了

Answer 4

一般是jdbc:mysql://localhost:3306/mydb
localhost就是你自己电脑的意思
www.070707zx.com是个什么网站吗？

Answer 5

jdbc:mysql://www.070707zx.com/mydb
看你的这个写法，好象你的数据库并不是本地的。但网页一般刷新几次后,又连接上数据库,可正常显示了
综合以上两点，我觉得你这个可能是连接的网络数据库。很有可能跟你WEB应用服务器和数据库服务器间的连接有关系。如果这种情况只是在hibernate被初次调用的时候才出现的话，也没什么大惊小怪的。那是因为hibernate还在连接数据库，有个时间过程，连接网络数据库是有这个问题。连接本地数据库或局域网数据库会好一些。

Answer 6

jdbc:mysql://www.070707zx.com/mydb
看你的这个写法，好象你的数据库并不是本地的。但网页一般刷新几次后,又连接上数据库,可正常显示了
综合以上两点，我觉得你这个可能是连接的网络数据库。很有可能跟你WEB应用服务器和数据库服务器间的连接有关系。如果这种情况只是在hibernate被初次调用的时候才出现的话，也没什么大惊小怪的。那是因为hibernate还在连接数据库，有个时间过程，连接网络数据库是有这个问题。连接本地数据库或局域网数据库会好一些。

Answer 7

jdbc:mysql://www.070707zx.com/mydb
看你的这个写法，好象你的数据库并不是本地的。但网页一般刷新几次后,又连接上数据库,可正常显示了
综合以上两点，我觉得你这个可能是连接的网络数据库。很有可能跟你WEB应用服务器和数据库服务器间的连接有关系。如果这种情况只是在hibernate被初次调用的时候才出现的话，也没什么大惊小怪的。那是因为hibernate还在连接数据库，有个时间过程，连接网络数据库是有这个问题。连接本地数据库或局域网数据库会好一些。

Answer 8

那以前我上传到web服务器上后没有这个问题, 而现在却有.
 即使连接上以后,在使用中还是偶尔有上面的错误提示.
后来我又使用了proxool连接池, 但还是有上面的错误提示, proxool连接配置如下:
<?xml version="1.0" encoding="UTF-8" ?><!-- the proxool configuration can be embedded within your own application's.
   Anything outside the "proxool" tag is ignored. --><something-else-entirely>
   <proxool>
      <alias>myPool</alias>
      <driver-url>
          jdbc:mysql://www.070707zx.com/mydb
      </driver-url>
      <driver-class>
          com.mysql.jdbc.Driver
      </driver-class>      <driver-properties>
          <property name="user" value="myusername"/>
          <property name="password" value="mypassword"/>
      </driver-properties>      <house-keeping-sleep-time>90000</house-keeping-sleep-time>
      <maximum-new-connections>20</maximum-new-connections>
      <prototype-count>5</prototype-count>
      <maximum-connection-count>100</maximum-connection-count>
      <minimum-connection-count>5</minimum-connection-count>
      <house-keeping-test-sql>select CURRENT_DATE</house-keeping-test-sql>
   </proxool>
</something-else-entirely>这是照着网上的文章直接写的.还是有错误.请大家快救我啊!

Answer 9

web server 是:Tomcat5.0.28
数据库是 mysql 5.0 难到大家就没有见过这种情况吗.

Answer 10

我用的驱动版本是mysql-connector-java-5.0.7, 应该是最新的了
===============================
 那你这里<driver-class> 
          com.mysql.jdbc.Driver 
       </driver-class> 
也要换下,org.gjt.mm.mysql.Driver,试试.

Answer 11

org.gjt.mm.mysql.Driver 试过不行,大侠们就不能帮帮忙吗?对这个问题,我都要气疯了!!!

Answer 12

我也遇到了同样的问题！本地和服务器都是这样，总是报无连接或session is closed！再刷新几次就好了，我觉得如果是配置文件有问题那应该一次都不成功才对！有成功的情况，而且有时报错应该是连接池的问题吧，到现在我的问题也没解决，困扰我一个多月了！一直在不停的找解决方法。proxool等第三方连接池也都用过了，仍然没有解决。希望高人看到这帖子能给个解决方案啊！陪楼主一起等。

Answer 13

此回复为自动发出,仅用于显示而已，并无任何其他特殊作用
楼主【wang_j_p】截止到2008-06-24 14:47:09的历史汇总数据(不包括此帖)：
发帖数:1                  发帖分:20                 
结贴数:1                  结贴分:20                 
未结数:0                  未结分:0                  
结贴率:100.00%            结分率:100.00%            
敬礼!

Answer 14

note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.看看还有什么错误信息！
比如说root cause等等！

Answer 15

org.springframework.transaction.CannotCreateTransactionException: Could not open Hibernate Session for transaction; nested exception is org.hibernate.exception.JDBCConnectionException: Cannot open connection 
    org.springframework.orm.hibernate3.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:599)
    org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:374)
    org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:263)
    org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:101)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
    org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
    org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
    $Proxy0.findAllS(Unknown Source)
    cn.com.action.StudentAction.findAllS(StudentAction.java:131)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    java.lang.reflect.Method.invoke(Unknown Source)
    com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:441)
    com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:280)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:243)
    com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:165)
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:252)
    org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:122)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:179)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:93)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:235)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:89)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:130)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    org.apache.struts2.interceptor.ProfilingActivationInterceptor.intercept(ProfilingActivationInterceptor.java:104)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:126)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:138)
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:165)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:179)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:176)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:235)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
    org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:468)
    org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:395)
    org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    org.apache.struts2.dispatcher.ActionContextCleanUp.doFilter(ActionContextCleanUp.java:102)
    org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
    org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
    org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
    org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    java.lang.Thread.run(Unknown Source)
    
org.hibernate.exception.JDBCConnectionException: Cannot open connection 
    org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:97)
    org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
    org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:52)
    org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:449)
    org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167)
    org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:142)
    org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:85)
    org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1354)
    org.springframework.orm.hibernate3.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:558)
    org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:374)
    org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:263)
    org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:101)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
    org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
    org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
    $Proxy0.findAllS(Unknown Source)
    cn.com.action.StudentAction.findAllS(StudentAction.java:131)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)