Java在ServletContext資源[/WEB-INF/spring-servlet.xml]中定義了名稱爲'dataSource'的無效bean定義：

Question

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收到此錯誤，

ERROR: org.springframework.web.servlet.DispatcherServlet - Context initialization failed 
org.springframework.beans.factory.BeanDefinitionStoreException: Invalid bean definition with name 'dataSource' defined in ServletContext resource [/WEB-INF/spring-servlet.xml]: Could not resolve placeholder 'jdbc.driverClassName' 

文件：jdbc.properties

jdbc.dialect=org.hibernate.dialect.MySQLDialect 
jdbc.databaseurl=jdbc:mysql://localhost:3306/StudentDB 
jdbc.username=root 
jdbc.password=admin 

文件：爲spring-servlet.xml

<bean id="propertyConfigurer" 
     class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer" 
     p:location="/WEB-INF/jdbc.properties" /> 

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" 
     destroy-method="close" p:driverClassName="${jdbc.driverClassName}" 
     p:url="${jdbc.databaseurl}" p:username="${jdbc.username}" p:password="${jdbc.password}" /> 
    <bean id="sessionFactory" 
     class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> 
     <property name="dataSource" ref="dataSource" /> 
     <property name="configLocation"> 
      <value>classpath:hibernate.cfg.xml</value> 
     </property> 
     <property name="configurationClass"> 
      <value>org.hibernate.cfg.AnnotationConfiguration</value> 
     </property> 
     <property name="hibernateProperties"> 
      <props> 
       <prop key="hibernate.dialect">${jdbc.dialect}</prop> 
       <prop key="hibernate.show_sql">true</prop> 
      </props> 
     </property> 
    </bean> 

Answer 1

您的屬性文件中似乎沒有名爲jdbc.driverClassName的屬性。

這也許應該是

jdbc.driverClassName=com.mysql.jdbc.Driver 

Answer 2

你在這些線路犯的錯誤

​​

比較你jdbc.properties文件目錄。

例如jdbc.properties文件內容：

Dialect=org.hibernate.dialect.MySQLDialect// for jdbc use this. Driver=com.mysql.jdbc.Driver 
Url=jdbc:mysql://localhost:3306/StudentDB 
Username=root 
Password=root 

在applicationContext.xml中，它應該是這樣的

<bean id="dataSource" 
    class="org.springframework.jdbc.datasource.DriverManagerDataSource" 
    p:driverClassName="${Dialect}" 
    p:url="${Url}" 
    p:username="${Username}" 
    p:password="${Password}" />