hibernate的C3P0连接池不能与cloudfoundry一起使用

Question

我正在尝试推出一个使用STS开发的简单hibernate MYSQL应用程序。Hibernate使用c3P0进行连接池。当我推送应用程序并开始访问它时，我看到与c3P0相关的异常。我在本地测试了它，它运行良好。

Caused by: com.mchange.v2.resourcepool.CannotAcquireResourceException: A

ResourcePool无法从其主要工厂或来源获取资源。com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable（BasicResourcePool.java:1319）com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource（BasicResourcePool.java:557）com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource（BasicResourcePool.java:477）com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection（C3P0PooledConnectionPool.java:525）

这是我正在使用的云配置文件。

 <beans profile="cloud">
         <bean id="c3p0DataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
            <property name="driverClass" value="com.mysql.jdbc.Driver" />
            <property name="jdbcUrl" value="${cloud.services.mysql.connection.jdbcUrl}" />
            <property name="user" value="${cloud.services.mysql.connection.username}" />
            <property name="password" value="${cloud.services.mysql.connection.password}" />
            <property name="minPoolSize" value="1" />
            <property name="maxPoolSize" value="3" />
            <property name="maxIdleTime" value="20" />
        </bean>
          <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="dataSource" ref="c3p0DataSource" />
    <property name="hibernateProperties">
    <props>
      <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop> 
      <prop key="hibernate.show_sql">true</prop> 
      <prop key="hibernate.hbm2ddl.auto">create</prop>
      <prop key="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</prop>
    </props>
      </property>
      <property name="packagesToScan" value="com.iml.policytype.model" /> 
       </bean>
      <tx:annotation-driven /> 
     <context:component-scan base-package="com.iml.policytype.bo" /> 
     <context:component-scan base-package="com.iml.policytype.dao" />
 <bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager" 
p:sessionFactory-ref="sessionFactory" />
</beans>

有人能帮忙吗？

这是个例外

org.springframework.transaction.CannotCreateTransactionException: Could not open Hibernate Session for transaction; nested exception is org.hibernate.exception.GenericJDBCException: Could not open connection
    at org.springframework.orm.hibernate4.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:514)
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:372)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:417)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:255)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
    at com.sun.proxy.$Proxy58.getPolicyType(Unknown Source)
    at com.symantec.netbackup.iml.webservice.PolicyTypeResource.getMsg(PolicyTypeResource.java:53)
    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:606)
    at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)
    at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:205)
    at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
    at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:288)
    at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
    at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
    at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
    at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
    at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1469)
    at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1400)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1349)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1339)
    at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)
    at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:537)
    at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:708)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:680)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)
Caused by: org.hibernate.exception.GenericJDBCException: Could not open connection
    at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:54)
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125)
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:110)
    at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:221)
    at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.getConnection(LogicalConnectionImpl.java:157)
    at org.hibernate.internal.SessionImpl.connection(SessionImpl.java:550)
    at org.springframework.orm.hibernate4.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:428)
    ... 47 more
Caused by: java.sql.SQLException: Connections could not be acquired from the underlying database!
    at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106)
    at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:529)
    at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:128)
    at org.hibernate.service.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:141)
    at org.hibernate.internal.AbstractSessionImpl$NonContextualJdbcConnectionAccess.obtainConnection(AbstractSessionImpl.java:292)
    at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:214)
    ... 50 more
Caused by: com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acquire a resource from its primary factory or source.
    at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1319)
    at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:557)
    at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:477)
    at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:525)
    ... 54 more

Answer 1

虽然我没有尝试使用个人资料，但我还是能够做到

下面是如果要使用 c3P0 时应使用的 xml。

        <cloud:data-source id="c3p0DataSource" service-name="mysql"/>
         <cloud:properties id="cloudProperties"/>
         <context:property-placeholder properties-ref="cloudProperties"/>

<bean id="c3p0DataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
            destroy-method="close">
            <property name="driverClass" value="com.mysql.jdbc.Driver" />
            <property name="jdbcUrl" value="jdbc:mysql://${cloud.services.mysql.connection.hostname}:${cloud.services.mysql.connection.port}/${cloud.services.mysql.connection.name}" />

            <property name="user" value="${cloud.services.mysql.connection.username}" />
            <property name="password" value="${cloud.services.mysql.connection.password}" />
            <property name="minPoolSize" value="2" />
            <property name="maxPoolSize" value="3" />
            <property name="maxIdleTime" value="319" />

        </bean>
        <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
            <property name="dataSource" ref="c3p0DataSource" />

            <property name="hibernateProperties">
                <props>
                    <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
                    <prop key="hibernate.show_sql">true</prop>
                    <prop key="hibernate.hbm2ddl.auto">create</prop>


                </props>
            </property>
            <property name="packagesToScan" value="com.iml.policytype.model" />
        </bean>

        <bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager"
            p:sessionFactory-ref="sessionFactory" />

我没有使用导致DB连接失败的变量{cloud.services.mysql.connection.jdbcUrl}。如果你观察环境。日志文件此项的值还包含用户名和密码，而不仅仅是主机名、端口名和数据库名。

另外，我看到的属性cloud . services . MySQL . connection . hostname(cloud . services . MySQL . connection . name)也导致了这个问题。我想这没什么大不了的，因为这取决于你使用的数据源。在某些情况下，它可以是名称，在某些情况下，它可以是主机名。

此外，突出显示的代码缺少我的xml中的条目。我现在将尝试使用配置文件功能，并根据我所看到的内容更新线程。