hibernate'org.hibernate.exception.JDBCConnectionException：無法執行查詢'

Question

我正在使用jsf 2.0與hibernate ..我的應用程序很好，當我退出晚上但我得到這個異常每天早上，我不得不重新啓動應用程序使其工作。

，是什麼原因

org.hibernate.exception.JDBCConnectionException: could not execute query 
org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:97) 
org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66) 
org.hibernate.loader.Loader.doList(Loader.java:2231) 
org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2125) 
org.hibernate.loader.Loader.list(Loader.java:2120) 
org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:401) 
org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:361) 
org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196) 
org.hibernate.impl.SessionImpl.list(SessionImpl.java:1148) 
org.hibernate.impl.QueryImpl.list(QueryImpl.java:102) 
chennaivolunteer.common.ViewActivityBean.getFirstngo(ViewActivityBean.java:156) 
sun.reflect.GeneratedMethodAccessor257.invoke(Unknown Source) 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
java.lang.reflect.Method.invoke(Method.java:597) 
javax.el.BeanELResolver.getValue(BeanELResolver.java:87) 
javax.el.CompositeELResolver.getValue(CompositeELResolver.java:67) 
org.apache.myfaces.el.unified.resolver.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:142) 
org.apache.el.parser.AstValue.getValue(AstValue.java:169) 
org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:189) 
org.apache.myfaces.view.facelets.el.TagValueExpression.getValue(TagValueExpression.java:85) 
org.apache.myfaces.view.facelets.component.UIRepeat.getValue(UIRepeat.java:246) 
org.apache.myfaces.view.facelets.component.UIRepeat.getDataModel(UIRepeat.java:209) 
org.apache.myfaces.view.facelets.component.UIRepeat._validateAttributes(UIRepeat.java:528) 
org.apache.myfaces.view.facelets.component.UIRepeat.process(UIRepeat.java:578) 
org.apache.myfaces.view.facelets.component.UIRepeat.encodeChildren(UIRepeat.java:1137) 
javax.faces.component.UIComponent.encodeAll(UIComponent.java:609) 
javax.faces.component.UIComponent.encodeAll(UIComponent.java:614) 
javax.faces.component.UIComponent.encodeAll(UIComponent.java:614) 
javax.faces.component.UIComponent.encodeAll(UIComponent.java:614) 
org.apache.myfaces.view.facelets.FaceletViewDeclarationLanguage.renderView(FaceletViewDeclarationLanguage.java:1159) 
org.apache.myfaces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:263) 
org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderResponseExecutor.java:85) 
org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:239) 
javax.faces.webapp.FacesServlet.service(FacesServlet.java:191) 
org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79) 
root cause 

com.mysql.jdbc.exceptions.MySQLNonTransientConnectionException: No operations allowed  
after connection closed.Connection was implicitly closed due to underlying exception/error: 

這是我的hibernate.cfg.xml提前

<hibernate-configuration> 
    <session-factory name=""> 
    <property name="connection.driver_class">com.mysql.jdbc.Driver</property> 
     <property name="connection.url">jdbc:mysql://192.168.1.200:3306    
    /chennai_volunteers</property> 
     <!-- <property name="connection.url">jdbc:mysql://localhost:330   
     /chennai_volunteers</property> --> 
    <property name="connection.username">root</property> 
     <property name="connection.password">root</property> 
    <property name="dialect">org.hibernate.dialect.MySQLDialect</property> 
    <property name="current_session_context_class">thread</property> 
    <property name="hibernate.connection.pool_size">100</property> 
    <!-- start c3p0 connection properties --> 
     <property name="c3p0.min_size">20</property> 
    <property name="c3p0.max_size">500</property> 
     <property name="c3p0.timeout">25200</property> 
    <property name="c3p0.acquireRetryAttempts">30</property> 
    <property name="c3p0.acquireIncrement">5</property> 
    <property name="c3p0.idleConnectionTestPeriod">14400</property> 
    <property name="c3p0.initialPoolSize">20</property> 
<property name="c3p0.maxPoolSize">300</property> 
    <property name="c3p0.maxIdleTime">300</property> 
<property name="c3p0.maxStatements">200</property> 
    <property name="c3p0.minPoolSize">10</property> 
    </session-factory> 
    </hibernate-configuration> 

感謝。

Answer 1

如果你想連接到永遠持續下去，你需要設置爲0（默認爲0）請參閱maxIdleTime這裏MaxIdleTime in c3p0

的設置。由於您在第二天早上將其設置爲300秒，所有空閒連接都被剔除。