为什么我将这个java.lang.ClassNotFoundException：org.apache.commons.dbcp.BasicDataSource获取到Spring应用程序中？

Question

我在Spring中很新，我在处理我正在处理的应用程序时遇到以下问题。

所以我会尝试解释这种情况。

这是我的 spring-config.xml beans配置文件：

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:security="http://www.springframework.org/schema/security" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
    xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context"
    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:task="http://www.springframework.org/schema/task"
    xmlns:util="http://www.springframework.org/schema/util" xmlns:jee="http://www.springframework.org/schema/jee"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
            http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd 
            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd 
            http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
            http://www.springframework.org/schema/security/spring-security-3.2.xsd">

    <context:component-scan base-package="it.hp.rav" />
    <context:annotation-config />


 <tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true"/>

 <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
  <property name="dataSource" ref="dataSourceMysql"/>
 </bean>

    <context:property-placeholder location="classpath*:dbconf.properties" /> 
  <bean id="dataSourceMysql"
    class="org.apache.commons.dbcp.BasicDataSource">
    <property name="driverClassName" value="com.mysql.jdbc.jdbc2.optional.MysqlDataSource" />
    <property name="url" value="${dbmysql.url}" />
    <property name="username" value="${dbmysql.user}" />
    <property name="password" value="${dbmysql.pwd}" />
    <property name="defaultAutoCommit" value="false" />
  </bean>
    <bean id="letturaDati" class="it.hp.rav.LetturaDati" autowire="byName" >
        <property name="dataSource" ref="dataSourceMysql" />
    </bean>
</beans>

正如您在前面的代码中所看到的，我已经声明了一个名为 dataSourceMysql 的bean，它是Spring类的一个实例 BasicDataSource

我还声明了 transactionManager bean来处理这个数据源的事务管理，我还通过以下方式激活了事务行为：

<tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true"/>

问题在于，当我尝试执行我的应用程序时，我在stacktrace中获得以下异常：

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager' defined in class path resource [spring-config.xml]: Cannot resolve reference to bean 'dataSourceMysql' while setting bean property 'dataSource'; nested exception is org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [org.apache.commons.dbcp.BasicDataSource] for bean with name 'dataSourceMysql' defined in class path resource [spring-config.xml]; nested exception is java.lang.ClassNotFoundException: org.apache.commons.dbcp.BasicDataSource
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:329)
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:107)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1393)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1134)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:522)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:461)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:295)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:292)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:626)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
    at it.hp.rav.controller.Controller.racuperaValori(Controller.java:17)
    at it.hp.rav.MAINApp.main(MAINApp.java:14)
Caused by: org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [org.apache.commons.dbcp.BasicDataSource] for bean with name 'dataSourceMysql' defined in class path resource [spring-config.xml]; nested exception is java.lang.ClassNotFoundException: org.apache.commons.dbcp.BasicDataSource
    at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1269)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:438)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:295)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:292)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:323)
    ... 16 more
Caused by: java.lang.ClassNotFoundException: org.apache.commons.dbcp.BasicDataSource
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at org.springframework.util.ClassUtils.forName(ClassUtils.java:260)
    at org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:416)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doResolveBeanClass(AbstractBeanFactory.java:1290)
    at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1261)
    ... 22 more

为什么呢？我错过了什么？我该如何解决这个问题呢？

要完成，我还要发布 pom.xml 文件：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>it.hp.rav</groupId>
  <artifactId>RAVBatch</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>RAVBatch</name>
  <description>batch rav</description>
  <properties>
        <spring.version>3.2.2.RELEASE</spring.version>
    </properties>
   <dependencies>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.17</version>
            <type>jar</type>
            <scope>compile</scope>
        </dependency>
        <!-- Spring Core -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <!-- Spring jdbc, for database -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.9</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <dependency>
            <groupId>commons-lang</groupId>
            <artifactId>commons-lang</artifactId>
            <version>2.6</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>cglib</groupId>
            <artifactId>cglib</artifactId>
            <version>2.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
            <dependency>
            <groupId>org.springframework.ldap</groupId>
            <artifactId>spring-ldap-core</artifactId>
            <version>1.3.1.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.ldap</groupId>
            <artifactId>spring-ldap-core-tiger</artifactId>
            <version>1.3.1.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.ldap</groupId>
            <artifactId>spring-ldap-odm</artifactId>
            <version>1.3.1.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.ldap</groupId>
            <artifactId>spring-ldap-ldif-core</artifactId>
            <version>1.3.1.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.ldap</groupId>
            <artifactId>spring-ldap-ldif-batch</artifactId>
            <version>1.3.1.RELEASE</version>
        </dependency>


    </dependencies> 
</project>

Answer 1

您正在使用org.apache.commons.dbcp.BasicDataSource，但尚未在POM中声明其依赖关系。

尝试在依赖项中添加以下内容：

<dependency>
    <groupId>commons-dbcp</groupId>
    <artifactId>commons-dbcp</artifactId>
    <version>1.4</version>
</dependency>