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注入自動裝配的依賴 Spring

[英]Injection of autowired dependencies Spring

 原文  2014-07-28 08:24:24  8   1    java/ spring/ spring-mvc

問題描述

我知道有幾個這樣的問題，但我仍然無法弄清楚為什么我的例子不起作用。

我有一個 Spring MVC 項目，其中有一個控制器：

    @Controller
public class StudentController {

    /** The Constant serialVersionUID. */
    private static final long serialVersionUID = 1L;
    private static Logger log = Logger.getLogger(StudentController.class);

    @Autowired
    @Qualifier("studentsManager")
    IStudentsManager studentsManager;

    @Autowired
    @Qualifier("departmentsManager")
    IDepartmentsManager departmentsManager;
...

StudentsManager 類：

@Transactional
@Repository
public class StudentsManager extends JdbcDaoSupport implements IStudentsManager {

    @Autowired
    @Qualifier("departmentsManager")
    private IDepartmentsManager departmentsManager;
...

DepartmentsManager 類：

    @Transactional
@Repository
public class DepartmentsManager extends JdbcDaoSupport implements
        IDepartmentsManager {

    /** The log. */
    private static Log log = LogFactory.getLog(DepartmentsManager.class);

    /** The departments. */
    private List<Department> departments = new ArrayList<Department>();


    public void addDepartment(int id, String name) {
        Department d = new Department(id, name);
        departments.add(d);
    }


    public void addDepartment(Department department)
            throws FileNotFoundException {
        if (log.isDebugEnabled()) {
            log.debug("Entered to add department method  ");
        }
        departments.add(department);
        StringBuilder sb = new StringBuilder();
        sb.append(department.toString()).append(" added");
        log.info(sb.toString());

        this.serialize();
    }

    public Department getDepartment(int departmentId) {
        if (log.isDebugEnabled()) {
            log.debug("Entered to getDepartment");
        }
        for (Department d : departments) {
            if (departmentId == d.getDepartmentId()) {
                return d;
            }
        }
        return null;
    }

    public Collection<Department> getAllDepartments() throws SQLException,
            ClassNotFoundException {
        if (log.isDebugEnabled()) {
            log.debug("Entered to getAllDepartments");
        }

        departments.clear();

        Class.forName("com.mysql.jdbc.Driver");
        String sql = "SELECT id, name FROM departments ORDER BY id";
        RowMapper<Department> rm = ParameterizedBeanPropertyRowMapper
                .newInstance(Department.class);
        return getJdbcTemplate().query(sql, rm);
    }

    public void serialize() throws FileNotFoundException {
        XStream xstream = new XStream();
        xstream.alias("departments", List.class);
        System.out.println(xstream.toXML(departments));
        FileOutputStream fos = new FileOutputStream("departments.xml", true); 
        xstream.toXML(departments, fos);
    }

    public void deserialize() throws FileNotFoundException {
        XStream xstream = new XStream();
        xstream.alias("departments", List.class);
        departments = (List<Department>) xstream.fromXML(new FileInputStream(
                "departments.xml"));
    }

}

整個應用環境：

    <?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/mvc"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:beans="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:jdbc="http://www.springframework.org/schema/jdbc"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
        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/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc.xsd">

    <!-- DispatcherServlet Context: defines this servlet's request-processing 
        infrastructure -->

    <!-- Enables the Spring MVC @Controller programming model -->
    <annotation-driven conversion-service="conversionService" />

    <context:component-scan base-package="amg.net.controller, amg.net.services" />

    <resources mapping="/resources/**" location="/resources/" />

    <!-- Resolves views selected for rendering by @Controllers to .jsp resources 
        in the /WEB-INF/views directory -->
    <beans:bean
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <beans:property name="prefix" value="/WEB-INF/views/" />
        <beans:property name="suffix" value=".jsp" />
    </beans:bean>

    <beans:bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
        destroy-method="close">
        <beans:property name="driverClassName" value="${jdbc.driverClassName}" />
        <beans:property name="url" value="${jdbc.url}" />
        <beans:property name="username" value="${jdbc.username}" />
        <beans:property name="password" value="${jdbc.password}" />
    </beans:bean>

    <context:property-placeholder location="classpath:jdbc.properties" />

    <beans:bean id="studentsManager" class="amg.net.services.StudentsManager">
        <beans:property name="dataSource" ref="dataSource" />
    </beans:bean>

    <beans:bean id="departmentsManager" class="amg.net.services.DepartmentsManager">
        <beans:property name="dataSource" ref="dataSource" />
    </beans:bean> 

</beans:beans>

堆棧跟蹤：

SEVERE: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'studentController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: amg.net.services.IStudentsManager amg.net.controller.StudentController.studentsManager; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'studentsManager': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private amg.net.services.IDepartmentsManager amg.net.services.StudentsManager.departmentsManager; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'departmentsManager' defined in file [/home/praktykant/Documents/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/Students/WEB-INF/classes/amg/net/services/DepartmentsManager.class]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: 'dataSource' or 'jdbcTemplate' is required
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:292)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1185)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:703)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4973)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5467)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: amg.net.services.IStudentsManager amg.net.controller.StudentController.studentsManager; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'studentsManager': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private amg.net.services.IDepartmentsManager amg.net.services.StudentsManager.departmentsManager; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'departmentsManager' defined in file [/home/praktykant/Documents/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/Students/WEB-INF/classes/amg/net/services/DepartmentsManager.class]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: 'dataSource' or 'jdbcTemplate' is required
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:508)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:289)
    ... 22 more
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'studentsManager': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private amg.net.services.IDepartmentsManager amg.net.services.StudentsManager.departmentsManager; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'departmentsManager' defined in file [/home/praktykant/Documents/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/Students/WEB-INF/classes/amg/net/services/DepartmentsManager.class]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: 'dataSource' or 'jdbcTemplate' is required
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:292)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1185)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1017)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:960)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:858)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:480)
    ... 24 more
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private amg.net.services.IDepartmentsManager amg.net.services.StudentsManager.departmentsManager; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'departmentsManager' defined in file [/home/praktykant/Documents/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/Students/WEB-INF/classes/amg/net/services/DepartmentsManager.class]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: 'dataSource' or 'jdbcTemplate' is required
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:508)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:289)
    ... 35 more
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'departmentsManager' defined in file [/home/praktykant/Documents/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/Students/WEB-INF/classes/amg/net/services/DepartmentsManager.class]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: 'dataSource' or 'jdbcTemplate' is required
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1553)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1017)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:960)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:858)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:480)
    ... 37 more
Caused by: java.lang.IllegalArgumentException: 'dataSource' or 'jdbcTemplate' is required
    at org.springframework.jdbc.core.support.JdbcDaoSupport.checkDaoConfig(JdbcDaoSupport.java:112)
    at org.springframework.dao.support.DaoSupport.afterPropertiesSet(DaoSupport.java:44)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1612)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1549)
    ... 47 more

我總是在沒有限定符的情況下這樣做並且它總是有效，但這次不是。 所以我添加了這個注釋，但仍然不起作用。

看起來組件掃描不起作用，但我試圖對它進行一些更改並且它是相同的，所以我想問題與它無關。

web.xml 文件：

    <?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

    <!-- The definition of the Root Spring Container shared by all Servlets 
        and Filters -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>
        /WEB-INF/spring/root-context.xml,
        /WEB-INF/spring/security.xml
        </param-value>
    </context-param>

    <!-- Creates the Spring Container shared by all Servlets and Filters -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!-- Processes application requests -->
    <servlet>
        <servlet-name>students</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/spring/appServlet/servlet-context.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>students</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <welcome-file-list>
        <welcome-file>/</welcome-file>
    </welcome-file-list>

    <filter>
        <filter-name>charsetEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>

        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
    </filter>

    <filter-mapping>
        <filter-name>charsetEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!-- Spring Security -->
    <filter>
        <filter-name>springSecurityFilterChain</filter-name>
        <filter-class>
                  org.springframework.web.filter.DelegatingFilterProxy
                </filter-class>
    </filter>

    <filter-mapping>
        <filter-name>springSecurityFilterChain</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

</web-app>

1 個解決方案

解決方案1
 1  2014-07-28 08:33:20

您需要根據這些類的作用使用 @Component、@Repository 或 @Service 注釋StudentsManager和DepartmentsManager 。

並且還要確保它們屬於您在春季掃描的包裹。

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