Spring注入出错，麻烦各位大侠解决下（Caused by: java.lang.IllegalArgumentException：Can not set ）

[我是小小小小程序媛]

框架是spring3.0MVC+Hibernate，在启动项目的时候，会报如下的错误：

严重: StandardWrapper.Throwable
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'loginController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: BIA.Service.LoginServiceImp BIA.Controller.LoginController.loginServiceImp; nested exception is java.lang.IllegalArgumentException: Can not set BIA.Service.LoginServiceImp field BIA.Controller.LoginController.loginServiceImp to $Proxy20
	Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: BIA.Service.LoginServiceImp BIA.Controller.LoginController.loginServiceImp; nested exception is java.lang.IllegalArgumentException: Can not set BIA.Service.LoginServiceImp field BIA.Controller.LoginController.loginServiceImp to $Proxy20
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:502)
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:84)
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:282)
	... 42 more
Caused by: java.lang.IllegalArgumentException: Can not set BIA.Service.LoginServiceImp field BIA.Controller.LoginController.loginServiceImp to $Proxy20
	at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:146)
	at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:150)
	at sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:63)
	at java.lang.reflect.Field.set(Field.java:657)
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:498)
	... 44 more
2014-4-30 14:20:03 org.apache.catalina.core.StandardContext loadOnStartup
严重: Servlet /BIAoa threw load() exception
java.lang.IllegalArgumentException: Can not set BIA.Service.LoginServiceImp field BIA.Controller.LoginController.loginServiceImp to $Proxy20
	at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:146)
	at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:150)
	at sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:63)
	at java.lang.reflect.Field.set(Field.java:657)
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:498)
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:84)
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:282)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1074)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:517)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:580)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:895)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:425)
	at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:442)
	at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:458)
	at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:339)
	at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:306)
	at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:127)
	at javax.servlet.GenericServlet.init(GenericServlet.java:212)
	at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1161)
	at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:981)
	at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4045)
	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4351)
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525)
	at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:920)
	at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:883)
	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)
	at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1138)
	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
	at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
	at org.apache.catalina.core.StandardService.start(StandardService.java:516)
	at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:566)
	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.catalina.startup.Bootstrap.start(Bootstrap.java:288)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)

这是LoginController的代码：

@Controller
public class LoginController {

	
	@Autowired //注入
	LoginServiceImp loginServiceImp;
	
	@RequestMapping(value="/login/{userId}/{userPwd}",method=RequestMethod.POST)
	public String login(@PathVariable("userId") String userId,@PathVariable("userPwd") String userPwd){
		
		boolean flag=loginServiceImp.login(userId, userPwd);
		if(flag){
			return "main";
		}else{
			
			return "login";
		}
	}	

	@InitBinder //初始化数据绑定器
	public void initBinder(WebDataBinder binder){
		
		//对日期型的数据进行绑定
		SimpleDateFormat dateFormat=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
		binder.registerCustomEditor(Date.class, new CustomDateEditor(
				dateFormat,true));
	}
	
	public LoginServiceImp getLoginServiceImp() {
		return loginServiceImp;
	}

	public void setLoginServiceImp(LoginServiceImp loginServiceImp) {
		this.loginServiceImp = loginServiceImp;
	}


}

这是LoginServiceImp的代码：

@Service //用于标注业务层组件
@Transactional 
public class LoginServiceImp implements LoginService{

	@Autowired LoginDao loginDao;

	public boolean login(String userId, String userPwd) {
		boolean flag=loginDao.login(userId, userPwd);
		return flag;
	}
	
	
}

LoginDao是定义的一个接口类，它的实现类就是通过hibernate对数据库的数据进行查询。

现在小弟想问的就是这个错误是因为什么产生的，应当如何解决。望各位大侠赐教

[我是小小小小程序媛]

怎么还没有高手来解决下，我的小伙伴们都急死了。

[xuefeng0707]

有接口LoginService，为什么要用实现类LoginServiceImp？ 把：

@Autowired //注入
    LoginServiceImp loginServiceImp;

改成：

@Autowired //注入
    LoginService loginService;

[我是小小小小程序媛]

引用 2 楼 xuefeng0707 的回复:

有接口LoginService，为什么要用实现类LoginServiceImp？ 把：

@Autowired //注入
    LoginServiceImp loginServiceImp;

改成：

@Autowired //注入
    LoginService loginService;

我试试去，看是不是又是我粗心大意的毛病犯事。