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创建Spring bean时出错

本文介绍了创建Spring bean时出错的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我使用Spring 3.1.4



控制器类

  package com.demo.scheduler.controller; 
 
 import java.util.Map; 
 
 import com.demo.scheduler.service.SchedulerService; 
 
 import org.springframework.beans.factory.annotation.Autowired; 
 import org.springframework.stereotype.Controller; 
 import org.springframework.web.bind.annotation.RequestMapping; 
 import org.springframework.web.bind.annotation.RequestMethod; 
 
 @Controller 
公共类SchedulerController {
 
 Private SchedulerService服务; 
 
 @Autowired 
 public Sc​​hedulerController（SchedulerService服务）{
 this.service = service; 
 
 
 $ b @RequestMapping（value =/ tasklist，method = RequestMethod.GET）
 public String listTask（Map< String，Object> model）{ 
 model.put（task，service.getTask（））; 
 
返回tasklist; 
 
 
 $ b $ / code $ / pre 
 
 
服务实现
  package com.demo.scheduler.service; 
 
 import com.demo.scheduler.TaskConfig; 
 
 @Service 
 @Transactional（propagation = Propagation.SUPPORTS，readOnly = true）
 public class SchedulerServiceImpl实现SchedulerService {
 @Autowired 
 public Sc​​hedulerDAO schedulerDAO ; 
 
 @Override 
 @Transactional（propagation = Propagation.REQUIRED，readOnly = false）
 public List< TaskConfig> getTask（）{
 
 return schedulerDAO.getTask（）; 
} 
 
} 
  
 DAO实现
  package com.demo.scheduler.dao; 
 
 import com.demo.scheduler.TaskConfig; 
 
 import java.util.List; 
 
 import org.hibernate.SessionFactory; 
 
 import org.springframework.beans.factory.annotation.Autowired; 
 import org.springframework.stereotype.Repository; 
 
 @Repository 
 public class HibernateDAO实现SchedulerDAO {
 
 @Autowired 
 private SessionFactory sessionFactory; 
 
 public HibernateDAO（SessionFactory sessionFactory）{
 this.sessionFactory = sessionFactory; 
 
} 
 
 @SuppressWarnings（unchecked）
 @Override 
 public List< TaskConfig> getTask（）{
 
 return sessionFactory.getCurrentSession（）。createCriteria（
 TaskConfig.class）.list（）; 
} 
 
} 
  
 web.xml 
 <？xml version =1.0encoding =UTF-8？> 
  xmlns =http://java.sun.com/xml/ns/j2eexmlns：xsi =http：/ /www.w3.org/2001/XMLSchema-instance
 xsi：schemaLocation =http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns /j2ee/web-app_2_4.xsd\"> 
< display-name> demoscheduler< / display-name> 
< welcome-file-list> 
< welcome-file> index.html< / welcome-file> 
< welcome-file> index.htm< / welcome-file> 
< welcome-file> index.jsp< / welcome-file> 
< welcome-file> default.html< / welcome-file> 
< welcome-file> default.htm< / welcome-file> 
< welcome-file> default.jsp< / welcome-file> 
< / welcome-file-list> 
 
< servlet> 
< servlet-name> demo< / servlet-name> 
< servlet-class> org.springframework.web.servlet.DispatcherServlet 
< / servlet-class>< / servlet> 
 
< servlet-mapping> 
< servlet-name> demo< / servlet-name> 
< url-pattern> /< / url-pattern> 
< / servlet-mapping>< session-config> 
< session-timeout> 60< / session-timeout> 
< / session-config> 
< / web-app> 
  
 demo-servlet.xml  
 
 
 <？xml version =1.0encoding =UTF-8？> 
< beans xmlns =http://www.springframework.org/schema/beans
 xmlns：xsi =http://www.w3.org/2001/XMLSchema-instancexmlns ：context =http://www.springframework.org/schema/context
 xmlns：tx =http://www.springframework.org/schema/tx
 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 
 http://www.springframework.org/schema/tx 
 http://www.springframework.org/schema/tx/spring-tx-3.0.xsd\"> 
 
< context：component-scan base-package =com.demo.scheduler/> 
< context：annotation-config /> 
< tx：annotation-driven /> 
 
< bean id =jspViewResolver
 class =org.springframework.web.servlet.view.InternalResourceViewResolver> 
< property name =viewClass
 value =org.springframework.web.servlet.view.JstlView/> 
< property name =prefixvalue =/ WEB-INF / jsp //> 
< property name =suffixvalue =。jsp/> 
< / bean> 
 
< bean id =propertyConfigurer
 class =org.springframework.beans.factory.config.PropertyPlaceholderConfigurer> 
< property name =location> 
<值> /WEB-INF/resources/hibernate.properties 
< /值> 
< / property> 
< / bean> 
 
 
< bean class =org.springframework.orm.hibernate3.LocalSessionFactoryBean
 id =sessionFactory> 
< property name =dataSourceref =dataSource> 
< / property> 
< property name =configLocations> 
< list> 
<值> /WEB-INF/resources/schedulerTask.hbm.xml 
< /值> 
< / list> 
< / property> 
< property name =hibernateProperties> 
<道具> 
< prop key =hibernate.dialect> $ {hibernate.dialect}< / prop> 
< prop key =hibernate.show_sql> $ {hibernate.show_sql}< / prop> 
< prop key =hibernate.format_sql> $ {hibernate.format_sql}< / prop> 
< prop key =hibernate.connection.provider_class> $ {hibernate.connection.provider_class} 
< / prop> 
< prop key =hibernate.c3p0.acquire_increment> $ {hibernate.c3p0.acquire_increment} 
< / prop> 
< prop key =hibernate.c3p0.idle_test_period> $ {hibernate.c3p0.idle_test_period} 
< / prop> 
< prop key =hibernate.c3p0.max_size> $ {hibernate.c3p0.max_size} 
< / prop> 
< prop key =hibernate.c3p0.max_statements> $ {hibernate.c3p0.max_statements} 
< / prop> 
< prop key =hibernate.c3p0.min_size> $ {hibernate.c3p0.min_size} 
< / prop> 
< prop key =hibernate.c3p0.timeout> $ {hibernate.c3p0.timeout} 
< / prop> 
< /道具> 
< / property> 
< / bean> 
 
< bean class =org.springframework.jdbc.datasource.DriverManagerDataSource
 id =dataSource> 
 
< property name =driverClassNamevalue =$ {hibernate.connection.driver_class}/> 
< property name =urlvalue =$ {hibernate.connection.url}/> 
< property name =usernamevalue =$ {hibernate.connection.username}/> 
< property name =passwordvalue =$ {hibernate.connection.password}/> 
< / bean> 
 
 
 
  class =org.springframework.orm.hibernate3.HibernateTransactionManager> 
< property name =sessionFactoryref =sessionFactory/> 
< / bean> 
 
< / beans> 
  
更新代码后，出现以下错误： 
 
 
 
 
解决方案
如果发现我的错误。问题是该配置中没有任何东西来实例化我的DAO bean。所以，我在应用程序上下文中修改了我的context：component-scan元素，以获取我的DAO。 
 < context：component-scan base-package =com.demo.scheduler> 
< context：include-filter type =annotation
 expression =org.springframework.stereotype.Service/> 
< context：include-filter type =annotation
 expression =org.springframework.stereotype.Repository/> 
< context：exclude-filter type =annotation
 expression =org.springframework.stereotype.Controller/> 
< / context：component-scan> 
  
感谢您的帮助@ M.Deinum和@SotiriosDelimanolis 
 
I'm using Spring 3.1.4
Controller class  
package com.demo.scheduler.controller;

import java.util.Map;

import com.demo.scheduler.service.SchedulerService;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
public class SchedulerController {

    private SchedulerService service;

    @Autowired
    public SchedulerController(SchedulerService service) {
        this.service = service;

    }

    @RequestMapping(value = "/tasklist",method = RequestMethod.GET)
    public String listTask(Map<String, Object> model) {
        model.put("task", service.getTask());

        return "tasklist";

    }
}

Service Implementation
package com.demo.scheduler.service;

import com.demo.scheduler.TaskConfig;

@Service
@Transactional(propagation = Propagation.SUPPORTS, readOnly = true)
public class SchedulerServiceImpl implements SchedulerService {
    @Autowired
    public SchedulerDAO schedulerDAO;

    @Override
    @Transactional(propagation = Propagation.REQUIRED, readOnly = false)
    public List<TaskConfig> getTask() {

        return schedulerDAO.getTask();
    }

}

DAO Implementation
package com.demo.scheduler.dao;

import com.demo.scheduler.TaskConfig;

import java.util.List;

import org.hibernate.SessionFactory;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

@Repository
public class HibernateDAO implements SchedulerDAO {

    @Autowired
    private SessionFactory sessionFactory;

    public HibernateDAO(SessionFactory sessionFactory) {
        this.sessionFactory = sessionFactory;

    }

    @SuppressWarnings("unchecked")
    @Override
    public List<TaskConfig> getTask() {

        return sessionFactory.getCurrentSession().createCriteria(
                TaskConfig.class).list();
    }

}

web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4"
    xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
    <display-name>demoscheduler</display-name>
    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
        <welcome-file>index.htm</welcome-file>
        <welcome-file>index.jsp</welcome-file>
        <welcome-file>default.html</welcome-file>
        <welcome-file>default.htm</welcome-file>
        <welcome-file>default.jsp</welcome-file>
    </welcome-file-list>

    <servlet>
        <servlet-name>demo</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet
        </servlet-class></servlet>

    <servlet-mapping>
        <servlet-name>demo</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping><session-config>
        <session-timeout>60</session-timeout>
    </session-config>
</web-app>

demo-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"
    xmlns:tx="http://www.springframework.org/schema/tx"
    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
           http://www.springframework.org/schema/tx
           http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">

    <context:component-scan base-package="com.demo.scheduler" />
    <context:annotation-config />
    <tx:annotation-driven />

    <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="propertyConfigurer"
        class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location">
            <value>/WEB-INF/resources/hibernate.properties
            </value>
        </property>
    </bean>


    <bean class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"
        id="sessionFactory">
        <property name="dataSource" ref="dataSource">
        </property>
        <property name="configLocations">
            <list>
                <value>/WEB-INF/resources/schedulerTask.hbm.xml
                </value>
            </list>
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">${hibernate.dialect}</prop>
                <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
                <prop key="hibernate.format_sql">${hibernate.format_sql}</prop>
                <prop key="hibernate.connection.provider_class">${hibernate.connection.provider_class}
                </prop>
                <prop key="hibernate.c3p0.acquire_increment">${hibernate.c3p0.acquire_increment}
                </prop>
                <prop key="hibernate.c3p0.idle_test_period">${hibernate.c3p0.idle_test_period}
                </prop>
                <prop key="hibernate.c3p0.max_size">${hibernate.c3p0.max_size}
                </prop>
                <prop key="hibernate.c3p0.max_statements">${hibernate.c3p0.max_statements}
                </prop>
                <prop key="hibernate.c3p0.min_size">${hibernate.c3p0.min_size}
                </prop>
                <prop key="hibernate.c3p0.timeout">${hibernate.c3p0.timeout}
                </prop>
            </props>
        </property>
    </bean>

    <bean class="org.springframework.jdbc.datasource.DriverManagerDataSource"
        id="dataSource">

        <property name="driverClassName" value="${hibernate.connection.driver_class}" />
        <property name="url" value="${hibernate.connection.url}" />
        <property name="username" value="${hibernate.connection.username}" />
        <property name="password" value="${hibernate.connection.password}" />
    </bean>



    <bean id="transactionManager"
        class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
    </bean>

</beans>

After updating the code, I getting the following error:  
 解决方案 
If found out my error.The problem is that there is nothing in that configuration to instantiate my DAO bean. So, I modified my "context:component-scan" element in application context to also pick up my DAO.  
<context:component-scan base-package="com.demo.scheduler">
        <context:include-filter type="annotation"
            expression="org.springframework.stereotype.Service" />
        <context:include-filter type="annotation"
            expression="org.springframework.stereotype.Repository" />
        <context:exclude-filter type="annotation"
            expression="org.springframework.stereotype.Controller" />
    </context:component-scan>

Thanks for the help @M.Deinum and @SotiriosDelimanolis
                        
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08-06 13:18
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