使用JdbcTemplate报找不到这个类

[Rivers.U]

通过注解的方式配置了SpringMVC，想使用JdbcTemplate，却报找不到。

spring-jdbc3.2的jar已经引入。

异常：

java.lang.ClassNotFoundException: org.springframework.jdbc.core.JdbcTemplate
	org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1645)
	org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1491)
	java.lang.Class.getDeclaredMethods0(Native Method)
	java.lang.Class.privateGetDeclaredMethods(Class.java:2427)
	java.lang.Class.getDeclaredMethods(Class.java:1791)

首先，在配置文件中声明了它。

​    <bean  id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate" >
        <constructor-arg ref="dataSource" />
    </bean>

然后，整了个AbstractBaseDao，注入它

public abstract class AbstractBaseDao {
    // SPRING JDBC模板接口
    private JdbcTemplate jdbcTemplate;


    public JdbcTemplate getJdbcTemplate() {
        return jdbcTemplate;
    }
    @Resource
    public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
        this.jdbcTemplate = jdbcTemplate;
    }
}

接着，做了个UserDao以及UserDaoImpl

@Component("userDao")
public class UserDaoImpl extends AbstractBaseDao implements UserDao {

    //用户登录
    public boolean login(String userName, String passWord) {

再弄了个servcie和serviceImpl

@Service
@Component("userService")
public class UserServiceImpl implements UserService {

    @Resource
    private UserDao userDao;

最后UserController

@Controller
@RequestMapping(value = "/user")
public class UserController {

    /**
     * 用户业务接口
     */
    @Autowired
    private UserService userService;

感觉上没有什么问题。在网上搜了几种配置方法都试了遍，老是有这个问题。

如果在类中不注入jdbcTemplate，而只配置在xml中的话，运行的时候就没有报错，说明JdbcTemplate这个类肯定是可以找到的。

是不是在注解的配置上出了问题，求哪个位大神指点一下。

​

[Yeehua]

你启用注解没？？

[Rivers.U]

引用 1 楼 yeehua 的回复:

你启用注解没？？

启用了。 还有这些异常。我完全是照着网上的步骤来做的。试了很多次 严重: Context initialization failed org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping': Initialization of bean failed; nested exception is org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [org.apache.commons.dbcp.BasicDataSource] for bean with name 'dataSource' defined in ServletContext resource [/WEB-INF/mvc-dispatcher-servlet.xml]; nested exception is java.lang.ClassNotFoundException: org.apache.commons.dbcp.BasicDataSource Related cause: org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [org.apache.commons.dbcp.BasicDataSource] for bean with name 'dataSource' defined in ServletContext resource [/WEB-INF/mvc-dispatcher-servlet.xml]; nested exception is java.lang.ClassNotFoundException: org.apache.commons.dbcp.BasicDataSource Related cause: org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [org.springframework.jdbc.core.JdbcTemplate] for bean with name 'jdbcTemplate' defined in ServletContext resource [/WEB-INF/mvc-dispatcher-servlet.xml]; nested exception is java.lang.ClassNotFoundException: org.springframework.jdbc.core.JdbcTemplate at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:532) 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:607) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479) at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:647) at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:598) at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:661) at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:517) at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:458) at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:138) at javax.servlet.GenericServlet.init(GenericServlet.java:212) at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1213) at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1026) at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4421) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4734) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:799) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:779) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:601) at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1429) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:297) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:836) at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:762) at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:631) at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:568) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:295) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:836) at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:762) at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1454) at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:74) at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1295) at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1387) at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:818) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:303) at sun.rmi.transport.Transport$1.run(Transport.java:159) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.Transport.serviceCall(Transport.java:155) at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) at java.lang.Thread.run(Thread.java:662) Caused by: org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [org.apache.commons.dbcp.BasicDataSource] for bean with name 'dataSource' defined in ServletContext resource [/WEB-INF/mvc-dispatcher-servlet.xml]; nested exception is java.lang.ClassNotFoundException: org.apache.commons.dbcp.BasicDataSource at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1263) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:581) at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1332) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doGetBeanNamesForType(DefaultListableBeanFactory.java:337) at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:316) at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:303) at org.springframework.context.support.AbstractApplicationContext.getBeanNamesForType(AbstractApplicationContext.java:1174) at org.springframework.web.servlet.handler.AbstractDetectingUrlHandlerMapping.detectHandlers(AbstractDetectingUrlHandlerMapping.java:73) at org.springframework.web.servlet.handler.AbstractDetectingUrlHandlerMapping.initApplicationContext(AbstractDetectingUrlHandlerMapping.java:58) at org.springframework.context.support.ApplicationObjectSupport.initApplicationContext(ApplicationObjectSupport.java:119) at org.springframework.web.context.support.WebApplicationObjectSupport.initApplicationContext(WebApplicationObjectSupport.java:72) at org.springframework.context.support.ApplicationObjectSupport.setApplicationContext(ApplicationObjectSupport.java:73) at org.springframework.context.support.ApplicationContextAwareProcessor.invokeAwareInterfaces(ApplicationContextAwareProcessor.java:117) at org.springframework.context.support.ApplicationContextAwareProcessor.postProcessBeforeInitialization(ApplicationContextAwareProcessor.java:92) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:399) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1479) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:524) ... 58 more Caused by: java.lang.ClassNotFoundException: org.apache.commons.dbcp.BasicDataSource at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526) at org.springframework.util.ClassUtils.forName(ClassUtils.java:258) at org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:415) at

[tony4geek]

你是不是少jar 了。

[Yeehua]

你这个是少DBCP的jar包了。。

[ay转身遇]

用注解报错。那扫描包是不是没有扫到?

[Rivers.U]

确实是少了jar.我用Intellj,在pom文件中增加了dbcp的jar。但是tomcat跑起来的时候，去target文件里一看，发现该jar没有被放到lib。 怎么解决呢？就是在IntellJ中的FILE设置Project Structure中有个Artifact里面配置lib的内容