Spring Web mvc - 无法实例化NoClassDefFoundError

时间：2016-12-12 13:18:45

标签： spring noclassdeffounderror

我的spring / servlet项目出了问题， 每次我尝试运行服务器时，都会收到以下错误：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'personDaoBd' defined in file [/home/excess/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/gouvlad/WEB-INF/classes/dao/impl/PersonDaoBd.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [dao.impl.PersonDaoBd]: Constructor threw exception; nested exception is java.lang.NoClassDefFoundError: dao/impl/Resources

以下是我的课程：

PersonDaoBd.java 

package dao.impl;
/* some imports */
...
@Service
public class PersonDaoBd implements IPersonDao {

    private String driverName = Resources.getString("KeyDriverName");
    private String url        = Resources.getString("KeyUrl");
    private String user       = Resources.getString("KeyUser"); 
    private String password   = Resources.getString("KeyPassword");
    private Connection connection;

    @Autowired
    private IPersonFactory personFactory;

    @Autowired
    private IGroupFactory groupFactory;

    /**
     * Constructor of the PersonDaoBd class
     * 
     * @throws SQLException if the connection failed
     */
    public PersonDaoBd() throws SQLException{
        connection = DriverManager.getConnection(url, user, password);
    }
    ...

Resources.java 

package dao.impl;

import java.util.MissingResourceException;
import java.util.ResourceBundle;

public class Resources {
    private static String BUNDLE_NAME = "dao.impl.messages";

    private static ResourceBundle RESOURCE_BUNDLE = ResourceBundle.getBundle(BUNDLE_NAME);

    public Resources() {
    }

    public static String getString(String key) {
        try {
            return RESOURCE_BUNDLE.getString(key);
        } catch (MissingResourceException e) {
            return '!' + key + '!';
        }
    }
}

这是我的控制器的开头：

package web;

/* skipped some imports...*/

@Controller
@RequestMapping("/annuaire")
public class AnnuaireController {

    protected final Log logger = LogFactory.getLog(getClass());

    @Autowired
    private IPersonDao dao;

    @RequestMapping(value = "/liste", method = RequestMethod.GET)
    public ModelAndView handleRequest(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        //System.out.println(dao);
        if (!Utils.isConnected(request.getSession())){
            logger.info("Returning connexion view");
            return new ModelAndView("connexion");
        }
        return new ModelAndView("annuaire");

    }

    @RequestMapping(value = "/style.css", method = RequestMethod.GET)
    public ModelAndView handleRequestStyle(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {

        return new ModelAndView("style");

    }    

}

以下是我的xml文件：

spring.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:context="http://www.springframework.org/schema/context"
    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">

    <context:annotation-config />

    <context:component-scan base-package="dao" />
    <context:component-scan base-package="dao.impl" />
    <context:component-scan base-package="bean" />
    <context:component-scan base-package="bean.impl" />

    <bean name="personFactory" class="bean.Person" scope="prototype"/>
    <bean name="IPersonFactory" class="bean.impl.PersonFactory">
        <lookup-method bean="personFactory" name="getPerson" />
    </bean>

    <bean name="groupFactory" class="bean.Group" scope="prototype"/>
    <bean name="IGroupFactory" class="bean.impl.GroupFactory">
        <lookup-method bean="groupFactory" name="getGroup" />
    </bean>


</beans>

最后，springapp-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:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
       http://www.springframework.org/schema/beans     
       http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-4.3.xsd">
<context:component-scan base-package="web" />
<context:component-scan base-package="dao.impl" />
<context:component-scan base-package="dao" />
<bean id="viewResolver"
    class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="viewClass"
        value="org.springframework.web.servlet.view.JstlView"></property>
    <property name="prefix" value="/WEB-INF/jsp/"></property>
    <property name="suffix" value=".jsp"></property>
</bean>
</beans>

我是春天的初学者，我从昨天开始就遇到这个问题，我无法弄清楚出了什么问题。看来Spring无法实例化personDaoBd对象，因为它没有找到Resources类。但是，这些类在同一个包中。 此外，我对这个不是bean的测试类没有问题：

package dao.impl;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "/spring.xml")
public class PersonDaoBdTest {

    @Autowired
    IPersonDao dao;

    ...

在这种情况下，PersonDaoBd对象被很好地实例化。我运行测试没问题。

如果有人对此有所了解，我将不胜感激！

编辑：这是完整的StackTrace：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'personDaoBd' defined in file [/home/excess/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/gouvlad/WEB-INF/classes/dao/impl/PersonDaoBd.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [dao.impl.PersonDaoBd]: Constructor threw exception; nested exception is java.lang.NoClassDefFoundError: dao/impl/Resources
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1110)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1055)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:751)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:861)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541)
    at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:668)
    at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:634)
    at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:682)
    at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:553)
    at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:494)
    at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
    at javax.servlet.GenericServlet.init(GenericServlet.java:158)
    at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1269)
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1182)
    at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1072)
    at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5368)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5660)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
    at org.apache.catalina.core.StandardContext.reload(StandardContext.java:4138)
    at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:425)
    at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1341)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1542)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1552)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1552)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1520)
    at java.lang.Thread.run(Thread.java:745)
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [dao.impl.PersonDaoBd]: Constructor threw exception; nested exception is java.lang.NoClassDefFoundError: dao/impl/Resources
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:154)
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:89)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1103)
    ... 31 more
Caused by: java.lang.NoClassDefFoundError: dao/impl/Resources
    at dao.impl.PersonDaoBd.<init>(PersonDaoBd.java:37)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:142)
    ... 33 more
Caused by: java.lang.ClassNotFoundException: dao.impl.Resources
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1892)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1735)
    ... 39 more

déc. 12, 2016 1:56:02 PM org.apache.catalina.core.ApplicationContext log
GRAVE: StandardWrapper.Throwable
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'personDaoBd' defined in file [/home/excess/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/gouvlad/WEB-INF/classes/dao/impl/PersonDaoBd.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [dao.impl.PersonDaoBd]: Constructor threw exception; nested exception is java.lang.NoClassDefFoundError: dao/impl/Resources
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1110)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1055)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:751)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:861)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541)
    at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:668)
    at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:634)
    at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:682)
    at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:553)
    at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:494)
    at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
    at javax.servlet.GenericServlet.init(GenericServlet.java:158)
    at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1269)
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1182)
    at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1072)
    at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5368)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5660)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
    at org.apache.catalina.core.StandardContext.reload(StandardContext.java:4138)
    at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:425)
    at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1341)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1542)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1552)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1552)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1520)
    at java.lang.Thread.run(Thread.java:745)
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [dao.impl.PersonDaoBd]: Constructor threw exception; nested exception is java.lang.NoClassDefFoundError: dao/impl/Resources
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:154)
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:89)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1103)
    ... 31 more
Caused by: java.lang.NoClassDefFoundError: dao/impl/Resources
    at dao.impl.PersonDaoBd.<init>(PersonDaoBd.java:37)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:142)
    ... 33 more
Caused by: java.lang.ClassNotFoundException: dao.impl.Resources
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1892)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1735)
    ... 39 more

déc. 12, 2016 1:56:02 PM org.apache.catalina.core.StandardContext loadOnStartup
GRAVE: Servlet [springapp] in web application [/gouvlad] threw load() exception
java.lang.ClassNotFoundException: dao.impl.Resources
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1892)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1735)
    at dao.impl.PersonDaoBd.<init>(PersonDaoBd.java:37)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:142)
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:89)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1103)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1055)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:751)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:861)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541)
    at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:668)
    at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:634)
    at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:682)
    at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:553)
    at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:494)
    at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
    at javax.servlet.GenericServlet.init(GenericServlet.java:158)
    at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1269)
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1182)
    at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1072)
    at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5368)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5660)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
    at org.apache.catalina.core.StandardContext.reload(StandardContext.java:4138)
    at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:425)
    at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1341)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1542)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1552)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1552)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1520)
    at java.lang.Thread.run(Thread.java:745)

的pom.xml：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>fr.univ-amu</groupId>
  <artifactId>gouvlad</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>gouvlad Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.12</version>
</dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>4.3.3.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-test</artifactId>
        <version>4.3.1.RELEASE</version>
    </dependency>
    <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>4.3.4.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.apache.taglibs</groupId>
    <artifactId>taglibs-standard-spec</artifactId>
    <version>1.2.5</version>
</dependency>
<dependency>
    <groupId>org.apache.taglibs</groupId>
    <artifactId>taglibs-standard-impl</artifactId>
    <version>1.2.5</version>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.38</version>
</dependency>
<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>3.1.0</version>
</dependency>
  </dependencies>
  <build>
    <finalName>gouvlad</finalName>
  </build>
</project>

1 个答案:

答案 0 :(得分：0)

刚刚找到解决方案 我在两个不同的库中有相同的包名称： - src / main / java中的dao.impl - src / test / java中的dao.impl

编译后，似乎位于src / test / java中的类未移动到.class文件夹。我还是不知道为什么。 我的Resources类位于此文件夹中。我只是将它移动到src / main / java并解决了问题。

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