@自动布线在现场级不起作用

Question

@Autowiring不在字段上工作，正在获取：

错误：

严重：标准包装。可丢弃org.springframework.beans.factory.BeanCreation异常：创建名为"contactController"的bean时出错：自动连线依赖项的注入失败；嵌套异常为org.springframework.beans.factory.BeanCreationException：无法自动连接字段：private net.viralpatel.contact.service.ContactService net.viralptel.contact controller.ContactController.ContactService；嵌套异常为org.springframework.beans.factory.BeanCreationException：创建名为"contactServiceImpl"的bean时出错：自动连接依赖项注入失败；嵌套异常为org.springframework.beans.factory.BeanCreationException：无法自动连接字段：private net.viralpatel.contact.dao.ContactDAO net.viralpate.contact.service.ContactServiceImpl.ContactDAO；嵌套异常为org.springframework.beans.factory.BeanCreationException：创建名为"contactDAOImpl"的bean时出错：注入自动连接的依赖项失败；嵌套异常为org.springframework.beans.factory.BeanCreationException：无法自动连接字段：private org.hubinate.SessionFactory net.viralpatel.contact.dao.ContactDAImpl.SessionFactory；嵌套异常为org.springframework.beans.factory.BeanCreationException：创建ServletContext资源[/WEB-INF/spring servlet.xml]中定义的名称为"sessionFactory"的bean时出错：初始化bean失败；嵌套异常是java.lang.NoClassDefFoundError:org/apache/commons/pool/impl/GenericObjectPool位于org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAannotationBeanpostProcessor.java:285)网址：org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1074)网址：org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:517)网址：org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)网址：org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291)位于org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)网址：org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory:java:288)网址：org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java：190)位于org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:580)位于org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:895)网址：org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:425)网址：org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java：442)网址：org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java：458)网址：org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java：339)网址：org.springframework.web.servlet.FrameworkServlet.initServlet Bean(FrameworkServlet.java：306)网址：org.springframework.web.servlet.HttpServlet Bean.init(HttpServlet Bean.java:127)位于javax.servlet.GenericServlet.init(GenericServlet.java：160)网址：org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1201)网址：org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1114)网址：org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1021)网址：org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4957)网址：org.apache.catalina.core.StandardContext$3.call(StandardContext.java：5284)网址：org.apache.catalina.core.StandardContext$3.call(StandardContext.java：5279)位于java.util.concurrent.FFutureTask$Sync.innerRun(FutureTask.java:303)位于java.util.concurrent.FFutureTask.run(FutureTask.java:138)位于java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)位于java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)在java.lang.Thread.run(Thread.java:662)

Myweb.xml是

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>Spring3-Hibernate</display-name>
<welcome-file-list>
<welcome-file>list.html</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>

我的spring-servlet.xml

<?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:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:jee="http://www.springframework.org/schema/jee" xmlns:lang="http://www.springframework.org/schema/lang"
xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee.xsd
http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd">
<context:annotation-config />
<context:component-scan base-package="net.viralpatel.contact" />
<bean id="jspViewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
<bean id="messageSource"
class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
<property name="basename" value="classpath:messages" />
<property name="defaultEncoding" value="UTF-8" />
</bean>
<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>
<tx:annotation-driven />
<bean id="transactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
</beans>

我的控制器是

package net.viralpatel.contact.controller;
import java.util.Map;
import net.viralpatel.contact.form.Contact;
import net.viralpatel.contact.service.ContactService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
@Controller
public class ContactController {
@Autowired
private ContactService contactService;
@RequestMapping("/index")
public String listContacts(Map<String, Object> map) {
map.put("contact", new Contact());
map.put("contactList", contactService.listContact());
return "contact";
}
@RequestMapping(value = "/add", method = RequestMethod.POST)
public String addContact(@ModelAttribute("contact")
Contact contact, BindingResult result) {
contactService.addContact(contact);
return "redirect:/index";
}
@RequestMapping("/delete/{contactId}")
public String deleteContact(@PathVariable("contactId")
Integer contactId) {
contactService.removeContact(contactId);
return "redirect:/index";
}
}

我的服务级别是

package net.viralpatel.contact.service;
import java.util.List;
import net.viralpatel.contact.form.Contact;
public interface ContactService {
public void addContact(Contact contact);
public List<Contact> listContact();
public void removeContact(Integer id);
}

服务级别impl是

package net.viralpatel.contact.service;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import net.viralpatel.contact.dao.ContactDAO;
import net.viralpatel.contact.form.Contact;
@Service
public class ContactServiceImpl implements ContactService {
@Autowired
private ContactDAO contactDao;
@Transactional
public void addContact(Contact contact) {
contactDao.addContact(contact);
}
@Transactional
public List<Contact> listContact() {
return contactDao.listContact();
}
@Transactional
public void removeContact(Integer id) {
contactDao.removeContact(id);
}
}

我正试图让@Autowiring发挥作用，但它不起作用，有什么建议或线索可以让它发挥作用吗？

Answer 1

您的异常很明显：

java.lang.NoClassDefFoundError:org/apache/commons/pool/impl/GenericObjectPool

这意味着您的类路径上没有commons-pool.jar。添加它。(在WEB-INF/lib中)

Answer 2

问题不是自动布线，而是NoClassDefFound:

自动连接依赖项的注入失败；嵌套异常是
创建ServletContext资源[/WEB-INF/spring servlet.xml]中定义的名称为"sessionFactory"的bean时出错：bean初始化失败嵌套异常为java.lang.NoClassDefFoundError:org/apache/commons/pool/impl/GenericObjectPool

确保公共池的JAR位于类路径上。

Answer 3

对于web应用程序，在类路径中有jar是不够的。它也必须在正确的位置。确保jar在WEB-INF/lib目录中，springjar也是如此。如果将其中一个放入容器的lib目录中，则可能会遇到类加载器问题。

通常，容器安装和webapp中的每个lib目录都有一个单独的类加载器，它们被组织在一个层次结构中。如果父类加载器中的类引用了子类中的类，则会出现此问题。

我的规则是只把东西放在WEB-INF/lib中。只有一次，我看到了一个很好的理由来更改任何容器lib目录的内容，既不添加也不删除也不升级。

Answer 4

我认为这就是这个例子，我可以毫无问题地运行这个例子。本例使用maven。确保你的pom.xml 中有这个

<dependency>
<groupId>commons-pool</groupId>
<artifactId>commons-pool</artifactId>
<version>20030825.183949</version>
</dependency>

可能是如果它的旧版本的类没有实现？另外，当你提取commons-pool.jar时(你提到过common-pool.jar，猜错了吧？)你在里面看到GenericObjectPool.class了吗？

Answer 5

这是由于自动连接依赖项的注入失败，即pom.xml 中的hibernate entitymanager bean

在pom.xml中添加以下依赖项：

hibernate-entitymanager / 3.2.0.ga jar file

再次mvn clean install，然后通过以下命令运行：

mvn org.mortbay.jetty:maven-jetty-plugin:run 

通过命令提示符避免丢失与java路径相关的异常