java - 如何修复“BeanCreationException”

问题描述

我正在尝试启动 Web 应用程序，但出现 BeanCreationException，表示未建立 Autowired 依赖项。

错误是这样的：异常 javax.servlet.ServletException：Servlet [mvc-dispatcher] 的 Servlet.init() 抛出异常 org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490) org.apache.catalina.valves.ErrorReportValve.invoke( ErrorReportValve.java:92) org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) org.apache.coyote.http11。 Http11Processor.service(Http11Processor.java:408) org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:853) org.apache.tomcat。 util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1587) org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) org.apache。 tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) java.base/java.lang.Thread.run(Thread.java:834)

根本原因

org.springframework.beans.factory.BeanCreationException：创建名为“coffeeController”的bean时出错：注入自动装配的依赖项失败；嵌套异常是 org.springframework.beans.factory.BeanCreationException：无法自动装配方法：public void app.controller.CoffeeController.setCoffeeService(app.service.CoffeeService); 嵌套异常是 org.springframework.beans.factory.BeanCreationException：在 ServletContext 资源 [/WEB-INF/mvc-dispatcher-servlet.xml] 中定义名称为“coffeeService”的 bean 创建时出错：设置时无法解析对 bean“coffeeDao”的引用bean 属性 'coffeeDao'; 嵌套异常是 org.springframework.beans.factory.BeanCreationException：在 ServletContext 资源 [/WEB-INF/mvc-dispatcher-servlet.xml] 中定义名称为“coffeeDao”的 bean 创建错误：bean 实例化失败；嵌套异常是 java.lang.NoClassDefFoundError: 无法初始化类 app.dao.CoffeeDaoImpl org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:292) org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory。 populateBean(AbstractAutowireCapableBeanFactory.java:1185) org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537) org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475) org. springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:304) org.springframework.beans.factory。

控制器类的示例。

public class CoffeeController {
    private CoffeeService coffeeService;

    @Autowired(required = true)
    @Qualifier(value = "coffeeService")
    public void setCoffeeService(CoffeeService coffeeService) {
        this.coffeeService = coffeeService;
    }

    @RequestMapping(value = "coffees", method = RequestMethod.GET)
    public String listCoffee(Model model) {
        model.addAttribute("coffee", new Coffee());
        model.addAttribute("listCoffee", this.coffeeService.listCoffee());

        return "coffees";
    }

    @RequestMapping(value = "/coffees/add", method = RequestMethod.POST)
    public String addCoffee(@ModelAttribute("coffee") Coffee coffee) {
        if (coffee.getId() == 0) {
            this.coffeeService.addCoffee(coffee);
        } else {
            this.coffeeService.updateCoffee(coffee);
        }

        return "redirect:/coffees";
    }

    @RequestMapping("/remove/{id}")
    public String removeCoffee(@PathVariable("id") int id) {
        this.coffeeService.removeCoffee(id);

        return "redirect:/coffees";
    }

    @RequestMapping("edit/{id}")
    public String editCoffee(@PathVariable("id") int id, Model model) {
        model.addAttribute("coffee", this.coffeeService.getCoffeeById(id));
        model.addAttribute("listCoffees", this.coffeeService.listCoffee());

        return "coffees";
    }

    @RequestMapping("coffeedata/{id}")
    public String coffeeData(@PathVariable("id") int id, Model model) {
        model.addAttribute("coffee", this.coffeeService.getCoffeeById(id));
        return "coffeedata";
    }
}

web.xml

<?xml version="1.0"?>

<web-app xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/j2ee" version="2.4">

    <display-name>Coffee Shop</display-name>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/mvc-dispatcher-servlet.xml</param-value>
    </context-param>
    <servlet>
        <servlet-name>mvc-dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>mvc-dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

</web-app>

mvc-调度程序-servlet-xml

<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:tx="http://www.springframework.org/schema/tx"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <context:component-scan base-package="app"/>
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
          destroy-method="close">
        <property name="driverClassName" value="com.postgres.jdbc.Driver"/>
        <property name="url"
                  value="jdbc:postgresql://localhost:5432/postgres"/>
        <property name="username" value="postgres"/>
        <property name="password" value="postgres"/>
    </bean>

    <bean id="hibernate4AnnotatedSessionFactory"
          class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="annotatedClasses">
            <list>
                <value>app.model.Coffee</value>
            </list>
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.PostgreSQL9Dialect
                </prop>
                <prop key="hibernate.show_sql">true</prop>
            </props>
        </property>
    </bean>


    <bean id="coffeeDao" class="app.dao.CoffeeDaoImpl">
        <property name="sessionFactory" ref="hibernate4AnnotatedSessionFactory"/>
    </bean>

    <bean id="coffeeService" class="app.service.CoffeeServiceImpl">
        <property name="coffeeDao" ref="coffeeDao"/>
    </bean>

    <context:component-scan base-package="app"/>

    <tx:annotation-driven transaction-manager="transactionManager"/>

    <bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <property name="sessionFactory" ref="hibernate4AnnotatedSessionFactory"/>
    </bean>

    <mvc:default-servlet-handler/>
    <mvc:annotation-driven/>

</beans>

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>com.springapp</groupId>
    <artifactId>CoffeeShop</artifactId>
    <packaging>war</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>CoffeeShop</name>

    <properties>
        <java-version>1.8</java-version>
        <org.springframework-version>4.0.3.RELEASE</org.springframework-version>
        <org.aspectj-version>1.7.4</org.aspectj-version>
        <org.slf4j-version>1.7.5</org.slf4j-version>
        <hibernate.version>4.3.5.Final</hibernate.version>
    </properties>
    <dependencies>
            <!-- Spring -->
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>${org.springframework-version}</version>
                <exclusions>
                    <!-- Exclude Commons Logging in favor of SLF4j -->
                    <exclusion>
                        <groupId>commons-logging</groupId>
                        <artifactId>commons-logging</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-webmvc</artifactId>
                <version>${org.springframework-version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-tx</artifactId>
                <version>${org.springframework-version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-test</artifactId>
                <version>4.2.1.RELEASE</version>
                <scope>test</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-orm</artifactId>
                <version>${org.springframework-version}</version>
            </dependency>

            <!-- Hibernate -->
            <dependency>
                <groupId>org.hibernate</groupId>
                <artifactId>hibernate-core</artifactId>
                <version>${hibernate.version}</version>
            </dependency>
            <dependency>
                <groupId>org.hibernate</groupId>
                <artifactId>hibernate-entitymanager</artifactId>
                <version>${hibernate.version}</version>
            </dependency>

            <!-- Apache Commons DBCP -->
            <dependency>
                <groupId>commons-dbcp</groupId>
                <artifactId>commons-dbcp</artifactId>
                <version>1.4</version>
            </dependency>

            <!-- Logging -->
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-api</artifactId>
                <version>${org.slf4j-version}</version>
            </dependency>
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>jcl-over-slf4j</artifactId>
                <version>${org.slf4j-version}</version>
                <scope>runtime</scope>
            </dependency>
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-log4j12</artifactId>
                <version>${org.slf4j-version}</version>
                <scope>runtime</scope>
            </dependency>
            <dependency>
                <groupId>log4j</groupId>
                <artifactId>log4j</artifactId>
                <version>1.2.15</version>
                <exclusions>
                    <exclusion>
                        <groupId>javax.mail</groupId>
                        <artifactId>mail</artifactId>
                    </exclusion>
                    <exclusion>
                        <groupId>javax.jms</groupId>
                        <artifactId>jms</artifactId>
                    </exclusion>
                    <exclusion>
                        <groupId>com.sun.jdmk</groupId>
                        <artifactId>jmxtools</artifactId>
                    </exclusion>
                    <exclusion>
                        <groupId>com.sun.jmx</groupId>
                        <artifactId>jmxri</artifactId>
                    </exclusion>
                </exclusions>
                <scope>runtime</scope>
            </dependency>

            <!-- Servlet -->
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>servlet-api</artifactId>
                <version>2.5</version>
                <scope>provided</scope>
            </dependency>
            <dependency>
                <groupId>javax.servlet.jsp</groupId>
                <artifactId>jsp-api</artifactId>
                <version>2.1</version>
                <scope>provided</scope>
            </dependency>
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>jstl</artifactId>
                <version>1.2</version>
            </dependency>

            <!-- Test -->
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.7</version>
                <scope>test</scope>
            </dependency>

            <!--PostgreSQL-->
              <dependency>
                      <groupId>org.postgresql</groupId>
                      <artifactId>postgresql</artifactId>
                      <scope>runtime</scope>
                    </dependency>
        </dependencies>

        <build>
            <finalName>BookManger</finalName>
            <plugins>
                <plugin>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <configuration>
                        <source>1.6</source>
                        <target>1.6</target>
                    </configuration>
                </plugin>
                <plugin>
                    <artifactId>maven-surefire-plugin</artifactId>
                    <configuration>
                        <includes>
                            <include>**/*Tests.java</include>
                        </includes>
                    </configuration>
                </plugin>
            </plugins>
        </build>
    </project>

CoffeeDaolmpl

package app.dao;

import app.model.Coffee;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Repository;

import java.util.List;
import java.util.logging.Logger;

@Repository
public class CoffeeDaoImpl implements CoffeeDao {
    private static final Logger logger = (Logger) LoggerFactory.getLogger(CoffeeDaoImpl.class);

    private SessionFactory sessionFactory;

    public void setSessionFactory(SessionFactory sessionFactory) {
        this.sessionFactory = sessionFactory;
    }

    @Override
    public void addCoffee(Coffee coffee) {
        Session session = this.sessionFactory.getCurrentSession();
        session.persist(coffee);
        logger.info("Кофе " + coffee + " успешно добавлен");
    }

    @Override
    public void updateCoffee(Coffee coffee) {
        Session session = this.sessionFactory.getCurrentSession();
        session.update(coffee);
        logger.info("Кофе " + coffee + " был успешно изменен");
    }

    @Override
    public void removeCoffee(int id) {
        Session session = this.sessionFactory.getCurrentSession();
        Coffee coffee = (Coffee) session.load(Coffee.class, id);
        if (coffee != null) {
            session.delete(coffee);
        }
        logger.info("Кофе " + coffee + " успешно удален.");
    }

    @Override
    public Coffee getCoffeeById(int id) {
        Session session = this.sessionFactory.getCurrentSession();
        Coffee coffee = (Coffee) session.load(Coffee.class, id);
        logger.info("Выбранный кофе: " + coffee);
        return coffee;
    }

    @Override
    @SuppressWarnings("unchecked")
    public List<Coffee> listCoffee() {
        Session session = this.sessionFactory.getCurrentSession();
        List<Coffee> coffeeList = session.createQuery("from Coffee").list();
        for (Coffee coffee : coffeeList) {
            logger.info("Coffee list " + coffee);
        }
        return coffeeList;
    }
}

标签： javaspringweb

java - 如何修复“BeanCreationException”

问题描述

解决方案

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