java 使用名称创建bean时出错
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时间：2020-11-03 06:01:00 来源:igfitidea点击:
Getting Error creating bean with name
提问by Brns
I'm creating a Spring MVC Maven module based project so I have divided every layer into a maven module. When I try to run a basic site, code compiles fine but I get the error:
我正在创建一个基于 Spring MVC Maven 模块的项目，所以我将每一层划分为一个 Maven 模块。当我尝试运行基本站点时，代码编译正常，但出现错误：
SEVERE: Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'addressController' defined in file [C:\Program Files\Apache Software Foundation\Tomcat 8.0\wtpwebapps\croz-web\WEB-INF\classes\hr\croz\bspoljaric\controller\AddressController.class]: Post-processing of merged bean definition failed; nested exception is java.lang.IllegalStateException: Failed to introspect bean class [hr.croz.bspoljaric.controller.AddressController] for resource metadata: could not find class that it depends on
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:525)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
at org.springframework.beans.factory.support.AbstractBeanFactory.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:759)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542)
at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4851)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5314)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.IllegalStateException: Failed to introspect bean class [hr.croz.bspoljaric.controller.AddressController] for resource metadata: could not find class that it depends on
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.findResourceMetadata(CommonAnnotationBeanPostProcessor.java:344)
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessMergedBeanDefinition(CommonAnnotationBeanPostProcessor.java:297)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyMergedBeanDefinitionPostProcessors(AbstractAutowireCapableBeanFactory.java:953)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:522)
... 20 more
Caused by: java.lang.NoClassDefFoundError: Lhr/croz/bspoljaric/service/AddressService;
at java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Unknown Source)
at java.lang.Class.getDeclaredFields(Unknown Source)
at org.springframework.util.ReflectionUtils.getDeclaredFields(ReflectionUtils.java:715)
at org.springframework.util.ReflectionUtils.doWithLocalFields(ReflectionUtils.java:656)
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.buildResourceMetadata(CommonAnnotationBeanPostProcessor.java:361)
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.findResourceMetadata(CommonAnnotationBeanPostProcessor.java:340)
... 23 more
Caused by: java.lang.ClassNotFoundException: hr.croz.bspoljaric.service.AddressService
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1333)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1167)
... 30 more
AddressDao.java
AddressDao.java
package hr.croz.bspoljaric.dao;
import java.util.List;
import hr.croz.bspoljaric.entity.Address;
public interface AddressDAO {
public void save(Address address);
public void delete(int addressID);
public Address get(int contactId);
public List<Address> getAll();
}
AddressDaoImpl.java
AddressDaoImpl.java
import java.util.List;
import org.springframework.stereotype.Repository;
import hr.croz.bspoljaric.dao.AddressDAO;
import hr.croz.bspoljaric.entity.Address;
@Repository
public class AddressDAOImpl implements AddressDAO{
@Override
public void save(Address address) {
// TODO Auto-generated method stub
}
@Override
public void delete(int addressID) {
// TODO Auto-generated method stub
}
@Override
public Address get(int contactId) {
// TODO Auto-generated method stub
return null;
}
@Override
public List<Address> getAll() {
List<Address> as = new ArrayList<>();
Address a = new Address();
a.setId(1l);
a.setStreet("MAKSIMIRSKA");
a.setStreetNo("2");
a.setCity(null);
as.add(a);
System.out.println("TEST: " + as.get(1));
return as;
}
}
AddressService.java
地址服务.java
package hr.croz.bspoljaric.service;
import java.util.List;
import hr.croz.bspoljaric.entity.Address;
public interface AddressService {
public List<Address> getAll();
}
AddressServiceImpl.java
AddressServiceImpl.java
package hr.croz.bspoljaric.serviceimpl;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import hr.croz.bspoljaric.dao.AddressDAO;
import hr.croz.bspoljaric.entity.Address;
import hr.croz.bspoljaric.service.AddressService;
@Service
public class AddressServiceImpl implements AddressService {
@Autowired
AddressDAO dao;
public List<Address> getAll() {
return dao.getAll();
}
}
AddressController.java
地址控制器.java
package hr.croz.bspoljaric.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import hr.croz.bspoljaric.service.AddressService;
@Controller
@RequestMapping("/test")
public class AddressController {
@Autowired
AddressService ads;
@RequestMapping(value = "/getAll", method = RequestMethod.GET)
public String getAllAddresses(Model model)
{
model.addAttribute("addresses", ads.getAll());
System.out.println("TEST!");
return "addressesListDisplay";
}
}
web.xml
网页.xml
<?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"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
version="2.5">
<display-name>Croz Web Application</display-name>
<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>
spring-servlet.xml
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: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:component-scan base-package="hr.croz.bspoljaric" />
<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/views/" />
<property name="suffix" value=".jsp" />
</bean>
Project view(all except web module):
项目视图（除web模块外的所有）：
Project view(web module):
项目视图（网络模块）：
回答by chaoluo
You need to mvn clean installin parent module to install the other module to local repo before you run your web module alone.
mvn clean install在单独运行 Web 模块之前，您需要在父模块中将另一个模块安装到本地存储库。
Or you can mvn clean install -amin web module, so that it will build the depended modules.
或者你可以mvn clean install -am在 web 模块中，这样它就会构建依赖的模块。
Please change the packaging to jar in service module, or just remove it, the default packaging is jar.
请在服务模块中将打包更改为jar，或者直接删除，默认打包为jar。
<packaging>jar</packaging>
<name>croz-service</name>
