Question

我在Spring Configuration中实现了Service，如下所示

<bean id="Dao" class="com.dao.DaoImpl" abstract="true"></bean>
       <bean id="eduservice" class="com.services.DaoServiceImpl"></bean>

当我尝试注入这个Dao bean时，我收到以下错误。错误StackTrace显示为：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'eduservice' defined in ServletContext resource [/WEB-INF/spring-config.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.ksrtc.services.DaoServiceImpl]: Is it an abstract class?; nested exception is java.lang.InstantiationException
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1101)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1046)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:504)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
    org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
    org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
    org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
    org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.autowireResource(CommonAnnotationBeanPostProcessor.java:461)
    org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.getResource(CommonAnnotationBeanPostProcessor.java:435)
    org.springframework.context.annotation.CommonAnnotationBeanPostProcessor$ResourceElement.getResourceToInject(CommonAnnotationBeanPostProcessor.java:559)
    org.springframework.beans.factory.annotation.InjectionMetadata$InjectedElement.inject(InjectionMetadata.java:169)
    org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
    org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessPropertyValues(CommonAnnotationBeanPostProcessor.java:305)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1210)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
    org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
    org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
    org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:755)
    org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757)
    org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
    org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:664)
    org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:630)
    org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:678)
    org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:549)
    org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:490)
    org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
    javax.servlet.GenericServlet.init(GenericServlet.java:158)
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    java.lang.Thread.run(Thread.java:745)

修改

ServiceImpl类是：

import java.util.List;
import java.util.Map;

import javax.persistence.Entity;

import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.dao.Dao;
import com.dao.DaoImpl;

@Service
public abstract class DaoServiceImpl<T> implements DaoService<T>{
    @Override
    @Transactional
    public void update(T entity) {
        getDomainDAO().update(entity);
    }

    @Override
    @Transactional
    public int save(T entity) {
        System.out.println(":::");
        return getDomainDAO().save(entity);
    }

    @Override
    @Transactional
    public void delete(T entity) {
        getDomainDAO().delete(entity);
    }

    @Override
    @Transactional(readOnly = true)
    public T find(int id) {
        return getDomainDAO().find(id);
    }

    @Override
    @Transactional(readOnly = true)
    public List<T> find() {
        return getDomainDAO().find();
    }

    @Override
    @Transactional
    public void saveOrUpdate(T entity) {
        getDomainDAO().saveOrUpdate(entity);
    }

    protected abstract Dao<T> getDomainDAO();

}

我需要帮助....请帮助我.... :(

Answer 1

可能就是你要做的事情，

编辑：在我看来你可能会追随spring look up method injection如果是这样，你应该是这样的

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<script>
var arr = [];
var users = ["brunofin", "comster404", "ESL_SC2", "OgamingSC2","cretetion","freecodecamp", "storbeck", "habathcx", "RobotCaleb", "noobs2ninjas"];
var i = 0;
var getUserData = function(arrUsers) {
   if(i<=arrUsers.length && arrUsers[i] != undefined){
    console.log(arrUsers[i]);
         $.ajax({
          url: "https://api.twitch.tv/kraken/streams/" + arrUsers[i][i],
          async: false,
          success: function(data) {
            arr.push(data);
          },
          error: function(data) {
            arr.push("blank");
          }
        });
    i ++;
    getUserData(users);
   }else{
     console.log(arr); 
   }
}

getUserData(users);
</script>

这里T，Dao customerDao = new Dao＆lt;＆gt;（）;

使用Spring Config实现抽象服务

1 个答案: