java - 不满意的依赖异常 : Error creating bean with name 'homeController' : Unsatisfied dependency expressed through field 'dao'-6ren

java - 不满意的依赖异常 : Error creating bean with name 'homeController' : Unsatisfied dependency expressed through field 'dao'

转载作者：行者123 更新时间：2023-12-02 00:57:17

org.springframework.beans.factory.UnsatisfiedDependencyException:创建名称为“homeController”的bean时出错:通过字段“dao”表达的依赖关系不满足；嵌套异常是org.springframework.beans.factory.UnsatisfiedDependencyException:创建名称为“alienDao”的bean时出错:通过字段“sessionFactory”表达的依赖关系不满足；嵌套异常是 org.springframework.beans.factory.BeanCreationException:

HomeController.java

package com.telusko.springmvc;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;


import com.telusko.springmvc.dao.AlienDao;
import com.telusko.springmvc.model.Alien;


@Controller
public class HomeController
{

    @Autowired
     AlienDao dao;

    @ModelAttribute
    public void modelData(Model m) 
    {
    m.addAttribute("name","Aliens");
    }

    @RequestMapping("/")
    public String home()
    {
        return "index";
    }

    @GetMapping("getAliens")
    public String getAliens(Model m)
    {
        m.addAttribute("result", dao.getAliens());
        return "showAliens";

    }

    @RequestMapping("addAlien")
    public String addAlien(@ModelAttribute Alien a)
    {

        return "result";

    }
}

AlienDao.java

 package com.telusko.springmvc.dao;
    import java.util.List;

    import javax.transaction.Transactional;

    import org.hibernate.Session;
    import org.hibernate.SessionFactory;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Repository;
    import org.springframework.stereotype.Service;

    import com.telusko.springmvc.model.Alien;

    @Service
    @Repository
    public class AlienDao
    {
        @Autowired
        private SessionFactory sessionFactory;

        @Transactional
    public List<Alien> getAliens()
    {
        Session session = sessionFactory.getCurrentSession();
        List <Alien> aliens = session.createQuery("from Alien",Alien.class).list();

        return aliens;
    }
    }

Alien.java

package com.telusko.springmvc.model;
import javax.persistence.Entity;
import javax.persistence.Id;

@Entity
public class Alien 
{
    @Id
    private int aid;
    private String aname;

    public int getAid() {
        return aid;
    }
    public void setAid(int aid) {
        this.aid = aid;
    }
    public String getAname() {
        return aname;
    }
    public void setAname(String aname) {
        this.aname = aname;
    }
    @Override
    public String toString() {
        return "Alien [aid=" + aid + ", aname=" + aname + "]";
    }


}

index.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
    Welcome to Telusko

    <form action="addAlien" method="POST">
        Enter your id : <input type="text" name="aid"><br>
        Enter your name : <input type="text" name="aname"><br>
        <input type="submit">
    </form>
</body>
</html>

结果.jsp

    <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
        pageEncoding="ISO-8859-1" isELIgnored="false"%>
    <!DOCTYPE html>
    <html>
    <head>
    <meta charset="ISO-8859-1">
    <title>Insert title here</title>
    </head>
    <body>
        Result is : ${alien}

        Welcome Back ${name}
    </body>
    </html>

显示外星人

 <%@ page language="java" contentType="text/html; 
    charset=ISO-8859-1"pageEncoding="ISO-8859-1" isELIgnored="false"%>
    <!DOCTYPE html>
    <html>
    <head>
    <meta charset="ISO-8859-1">
    <title>Insert title here</title>
    </head>
    <body>

        ${result}
    </body>
    </html>

telusko-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>

    <beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:ctx="http://www.springframework.org/schema/context"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
    http://www.springframework.org/schema/mvc
    http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-2.5.xsd">

    <ctx:component-scan base-package="com.telusko"></ctx:component-scan>
    <ctx:annotation-config></ctx:annotation-config>


    <bean id="myDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
    <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
    <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/telusko"></property>
    <property name="user" value="root"></property>
    <property name="password" value="12345678"></property>

    <property name="minPoolSize" value="5" />
    <property name="maxPoolSize" value="10" />
    <property name="maxIdleTime" value="30000" />
    </bean>


    <bean id="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
    <property name="dataSource" ref="myDataSource" />
    <property name="packageToScan" value="com.telusko.springmvc.model" />
    <property name="hibernateProperties">
    <props>
    <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
    <prop key="hibernate.show_sql">true</prop>
    </props>
    </property>  
    </bean>



    <bean id="myTransactionManager" class="org.springframework.orm.hibernate5.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory" />
    </bean>

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

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/views/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>

    </beans>

web.xml

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>

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

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


</web-app>

错误显示

HTTP Status 500 – Internal Server Error
Type Exception Report

Message Servlet.init() for servlet [telusko] threw exception

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

javax.servlet.ServletException: Servlet.init() for servlet [telusko] threw exception
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
    org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:688)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
    org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373)
    org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
    org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
    org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1594)
    org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    java.lang.Thread.run(Unknown Source)
Root Cause

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'homeController': Unsatisfied dependency expressed through field 'dao'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'alienDao': Unsatisfied dependency expressed through field 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in ServletContext resource [/WEB-INF/telusko-servlet.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'packageToScan' of bean class [org.springframework.orm.hibernate5.LocalSessionFactoryBean]: Bean property 'packageToScan' is not writable or has an invalid setter method. Did you mean 'packagesToScan'?
    org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:643)
    org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:130)
    org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1422)

最佳答案

在堆栈跟踪之后，您必须将属性 packageToScan 重命名为 packagesToScan

关于java - 不满意的依赖异常 : Error creating bean with name 'homeController' : Unsatisfied dependency expressed through field 'dao' ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/61188611/

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java - 不满意的依赖异常 : Error creating bean with name 'homeController' : Unsatisfied dependency expressed through field 'dao'