Question

问题：

我正在创建一个用于在类中执行方法的切入点。这个类是一个控制器类，由注释@Controller表示，因此方面不需要bean。我附加了调度程序servlet代码，方面和控制器类。可以找出问题所在。

DISPATCHER SERVLET：

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
 xmlns:context="http://www.springframework.org/schema/context"
 xmlns:p="http://www.springframework.org/schema/p"
 xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx"
 xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
       http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.0.xsd
    http://www.springframework.org/schema/aop 
       http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
       http://www.springframework.org/schema/tx 
       http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">

 <context:annotation-config />
 <context:spring-configured />

 <aop:aspectj-autoproxy /> 
  <bean id="LoggerBean" class="com.persistent.eap.aop.LoggerAspect" /> 


 <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" >
 <property name="order" value="0" />
 </bean>
 <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
 <bean class="com.persistent.eap.validators.UserRegistrationValidator" />

 <bean id="userRegistrationService" class="com.persistent.eap.service.impl.UserRegistrationServiceImpl" />
 <bean id="userOperationsService" class="com.persistent.eap.service.impl.UserOperationsServiceImpl" />

 <bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
        <property name="basename" value="messages"/>
    </bean>

 <bean id="tilesViewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver">
  <property name="viewClass" value="org.springframework.web.servlet.view.tiles2.TilesView"/>
 </bean> 
 <bean id="tilesConfigurer" class="org.springframework.web.servlet.view.tiles2.TilesConfigurer" p:definitions="/WEB-INF/tiles-defs.xml" />     


 <context:component-scan base-package="com.persistent.eap.controllers" />
 <context:component-scan base-package="com.persistent.eap.service" />
    <context:component-scan base-package="com.persistent.eap.dao" />

    <import resource="databaseContext.xml"/>


 <bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping" >
  <property name="order" value="1" />
  <property name="mappings">
   <value>
    /*.htm=urlController
            </value>
  </property>
 </bean>

 <bean id="urlController"
  class="org.springframework.web.servlet.mvc.UrlFilenameViewController" />


</beans>

ASPECT：

package com.persistent.eap.aop;

import org.aspectj.lang.ProceedingJoinPoint;

import org.aspectj.lang.annotation.Aspect;

import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Pointcut;
//import org.aspectj.lang.annotation.Before;


@Aspect
public class LoggerAspect {


  @Pointcut("execution(* com.persistent.eap.controllers.UserRegistrationController.setUpForm(..))")
  public void controllerMethods(){}

     @Around("controllerMethods()")
     public Object controllerMethodCall(ProceedingJoinPoint call) throws Throwable{
        System.out.println("[LOGGING INFO : Entering Method "+call.toShortString()+" ]");

     Object point=call.proceed();

     System.out.println("[LOGGING INFO : Exiting Method "+call.toShortString()+" with return as "+point+" ]");
     return point;
     }



}

控制器类：

package com.persistent.eap.controllers;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import com.persistent.eap.domain.UserDetails;
import com.persistent.eap.service.intfc.UserRegistrationService;
import com.persistent.eap.validators.UserRegistrationValidator;

@Controller
@RequestMapping("/userRegistrationForm.htm")
public class UserRegistrationController {

 private UserRegistrationService userRegistrationService;
 private UserRegistrationValidator userRegistrationValidator;

 @Autowired
 public UserRegistrationController(UserRegistrationService userRegistrationService
                            ,UserRegistrationValidator userRegistrationValidator) {
  this.userRegistrationService = userRegistrationService;
  this.userRegistrationValidator = userRegistrationValidator;
 }

 @RequestMapping(method=RequestMethod.GET)
 public String setUpForm(ModelMap model){
  UserDetails userDetails = new UserDetails();
  model.addAttribute("userDetails", userDetails);
  return "userRegistrationForm";
 }

 @RequestMapping(method=RequestMethod.POST)
 public String onSubmit(@ModelAttribute("userDetails") UserDetails userDetails,BindingResult result){
  userRegistrationValidator.validate(userDetails, result);
  if(result.hasErrors()){
   return "userRegistrationForm";
  }
  else{
   System.out.println(userDetails.getId()+"  "+userDetails.getUsername());
   userRegistrationService.registerUserDetails(userDetails); 
   return "userRegistrationSuccess";
  }
 }

}

控制台错误：

SEVERE: StandardWrapper.Throwable
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping#0' defined in ServletContext resource [/WEB-INF/dispatcher-servlet.xml]: Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRegistrationController' defined in file [C:\Documents and Settings\samiksha_kalra\Desktop\VMforce\EclipseWorkspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\EAPProject\WEB-INF\classes\com\persistent\eap\controllers\UserRegistrationController.class]: Initialization of bean failed; nested exception is org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class com.persistent.eap.controllers.UserRegistrationController]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:527)
 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:1173)
 at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:993)
 at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4350)
 at org.apache.catalina.core.StandardContext.start(StandardContext.java:4659)
 at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
 at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)
 at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
 at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:445)
 at org.apache.catalina.core.StandardService.start(StandardService.java:519)
 at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
 at org.apache.catalina.startup.Catalina.start(Catalina.java:581)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 at java.lang.reflect.Method.invoke(Unknown Source)
 at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
 at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRegistrationController' defined in file [C:\Documents and Settings\samiksha_kalra\Desktop\VMforce\EclipseWorkspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\EAPProject\WEB-INF\classes\com\persistent\eap\controllers\UserRegistrationController.class]: Initialization of bean failed; nested exception is org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class com.persistent.eap.controllers.UserRegistrationController]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:527)
 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.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1075)
 at org.springframework.web.servlet.handler.AbstractUrlHandlerMapping.registerHandler(AbstractUrlHandlerMapping.java:383)
 at org.springframework.web.servlet.handler.AbstractUrlHandlerMapping.registerHandler(AbstractUrlHandlerMapping.java:362)
 at org.springframework.web.servlet.handler.AbstractDetectingUrlHandlerMapping.detectHandlers(AbstractDetectingUrlHandlerMapping.java:82)
 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:106)
 at org.springframework.context.support.ApplicationContextAwareProcessor.postProcessBeforeInitialization(ApplicationContextAwareProcessor.java:85)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:394)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1413)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
 ... 31 more
Caused by: org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class com.persistent.eap.controllers.UserRegistrationController]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given
 at org.springframework.aop.framework.Cglib2AopProxy.getProxy(Cglib2AopProxy.java:212)
 at org.springframework.aop.framework.ProxyFactory.getProxy(ProxyFactory.java:112)
 at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.createProxy(AbstractAutoProxyCreator.java:476)
 at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.wrapIfNecessary(AbstractAutoProxyCreator.java:362)
 at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:322)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:407)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1426)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
 ... 49 more
Caused by: java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given
 at net.sf.cglib.proxy.Enhancer.emitConstructors(Enhancer.java:718)
 at net.sf.cglib.proxy.Enhancer.generateClass(Enhancer.java:499)
 at net.sf.cglib.transform.TransformingClassGenerator.generateClass(TransformingClassGenerator.java:33)
 at net.sf.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
 at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:216)
 at net.sf.cglib.proxy.Enhancer.createHelper(Enhancer.java:377)
 at net.sf.cglib.proxy.Enhancer.create(Enhancer.java:285)
 at org.springframework.aop.framework.Cglib2AopProxy.getProxy(Cglib2AopProxy.java:200)
 ... 56 more
Dec 20, 2010 6:28:42 PM org.apache.catalina.core.StandardContext loadOnStartup
SEVERE: Servlet /EAPProject threw load() exception
java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given
 at net.sf.cglib.proxy.Enhancer.emitConstructors(Enhancer.java:718)
 at net.sf.cglib.proxy.Enhancer.generateClass(Enhancer.java:499)
 at net.sf.cglib.transform.TransformingClassGenerator.generateClass(TransformingClassGenerator.java:33)
 at net.sf.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
 at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:216)
 at net.sf.cglib.proxy.Enhancer.createHelper(Enhancer.java:377)
 at net.sf.cglib.proxy.Enhancer.create(Enhancer.java:285)
 at org.springframework.aop.framework.Cglib2AopProxy.getProxy(Cglib2AopProxy.java:200)
 at org.springframework.aop.framework.ProxyFactory.getProxy(ProxyFactory.java:112)
 at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.createProxy(AbstractAutoProxyCreator.java:476)
 at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.wrapIfNecessary(AbstractAutoProxyCreator.java:362)
 at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:322)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:407)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1426)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
 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.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1075)
 at org.springframework.web.servlet.handler.AbstractUrlHandlerMapping.registerHandler(AbstractUrlHandlerMapping.java:383)
 at org.springframework.web.servlet.handler.AbstractUrlHandlerMapping.registerHandler(AbstractUrlHandlerMapping.java:362)
 at org.springframework.web.servlet.handler.AbstractDetectingUrlHandlerMapping.detectHandlers(AbstractDetectingUrlHandlerMapping.java:82)
 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:106)
 at org.springframework.context.support.ApplicationContextAwareProcessor.postProcessBeforeInitialization(ApplicationContextAwareProcessor.java:85)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:394)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1413)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
 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:1173)
 at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:993)
 at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4350)
 at org.apache.catalina.core.StandardContext.start(StandardContext.java:4659)
 at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
 at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)
 at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
 at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:445)
 at org.apache.catalina.core.StandardService.start(StandardService.java:519)
 at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
 at org.apache.catalina.startup.Catalina.start(Catalina.java:581)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 at java.lang.reflect.Method.invoke(Unknown Source)
 at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
 at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)

Answer 1

这是Spring AOP的限制。当您使用AspectJ切入点将方法编织到bean中时，Spring将使用CGLIB生成目标的子类，并从该子类调用方面。

但是，如果目标类没有公共默认构造函数，则会失败。 CGLIB确实有能力处理这个问题，但这一切都隐藏在Spring AOP的背后，你无法改变这种行为。

我只能建议你回去使用setter注入你的控制器，而不是构造函数注入。我知道，这不是理想的，但我想不出任何其他的解决方法。

创建名为'org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping＃0'的bean在ServletContext资源中定义时出错

1 个答案: