Question

我无法使用Spring，Hibernate和MySql创建dataSource bin作为c3p0 connectionPool

我的错误：

java.lang.NoSuchMethodError: com.mchange.v2.c3p0.impl.C3P0Defaults.dataSourceName()Ljava/lang/String;
    at com.mchange.v2.c3p0.impl.PoolBackedDataSourceBase.<init>(PoolBackedDataSourceBase.java:49)
    at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.<init>(AbstractPoolBackedDataSource.java:74)
    at com.mchange.v2.c3p0.ComboPooledDataSource.<init>(ComboPooledDataSource.java:134)
    at com.mchange.v2.c3p0.ComboPooledDataSource.<init>(ComboPooledDataSource.java:130)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:147)

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager' defined in ServletContext resource [/WEB-INF/dispatcher-servlet.xml]: Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in ServletContext resource [/WEB-INF/dispatcher-servlet.xml]: Cannot resolve reference to bean 'dataSource' while setting bean property 'dataSource'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in ServletContext resource [/WEB-INF/dispatcher-servlet.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.mchange.v2.c3p0.ComboPooledDataSource]: Constructor threw exception; nested exception is java.lang.NoSuchMethodError: com.mchange.v2.c3p0.impl.C3P0Defaults.dataSourceName()Ljava/lang/String;

我的春季配置：

<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
    <property name="driverClass" value="com.mysql.jdbc.Driver" />
    <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/screenshots" />
    <property name="user" value="root" />
    <property name="password" value="root" />

    <property name="acquireIncrement" value="1"></property>
    <property name="minPoolSize" value="5" />
    <property name="maxPoolSize" value="10" />
    <property name="maxIdleTime" value="1800" />
</bean>

<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean" lazy-init="false" autowire="default">
    <property name="dataSource">
        <ref local="dataSource" />
    </property>
    <property name="packagesToScan" value="com.webscreenshots.bean"/>
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
            <prop key="hibernate.max_fetch_depth">3</prop>
            <prop key="hibernate.jdbc.fetch_size">50</prop>
            <prop key="hibernate.jdbc.batch_size">10</prop>
            <prop key="hibernate.show_sql">true</prop>
            <prop key="hibernate.hbm2ddl.auto">update</prop>
        </props>
    </property>
</bean>

<tx:annotation-driven />
<bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory" />
</bean>

和我的POM依赖项：

<dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.28</version>
        </dependency>

        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.2.1</version>
        </dependency>

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-c3p0</artifactId>
            <version>4.3.0.Final</version>
        </dependency>

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>4.3.0.Final</version>
        </dependency>

我正在使用Spring 3.2。

这是典型的配置，我不介意出了什么问题。你能给我一些建议吗？

Answer 1

很可能你的应用程序的CLASSPATH中有一个旧版本的c3p0，这种方式与ClassLoader委派相结合，在你的有效代码库中导致了c3p0的混合版本。调用触发NoSuchMethod错误的方法被添加到0.9.2-pre6（well prior附近的某个地方，你认为你正在使用的版本为c3p0 0.9.2.1）。也许您已经引入了0.9.1.x版本以及托管依赖项（请注意，早于c3p0-0.9.2.x的版本具有与更新版本不同的组名），否则您将拥有一个非托管jar文件在某个地方。

您在上面列出的依赖项看起来没问题，hibernate-c3p0-4.3.0.Final取决于您明确添加的相同版本的c3p0。但是你可能想尝试不明确地将c3p0作为依赖项添加，只是让hibernate-c3p0引入它的版本。请注意，从4.2.3开始，您想要的c3p0版本是一个hibernate依赖项;如果你以某种方式从旧版本中引入依赖项，那么你可能会遇到问题。无论如何，您需要了解应用程序的有效CLASSPATH（包括JVM扩展目录），并找出旧版本与您要使用的版本共存的位置。

Answer 2

我的问题是acquireIncrement类的com.mchange.v2.c3p0.ComboPooledDataSource属性应该是这样的

<property name="acquireIncrement">1</property>

OR

<property name="acquireIncrement" value="1"/>

尝试更改此设置并再次运行您的应用程序

<强> Configuring the built-in c3p0 pooling in Hibernate using Spring

希望这能解决您的问题！

无法使用Spring，Hibernate和c3p0创建dataSource bin

2 个答案: