idref標記沒有在春季

Question

我使用idref標記來引用另外一個bean的工作，但是Spring框架拋出一個類型皈依錯誤，請參閱下面我spring.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" 
     xsi:schemaLocation="http://www.springframework.org/schema/beans 
          http://www.springframework.org/schema/beans/spring-beans.xsd"> 

    <bean id = "triangle" class="org.dxc.javatechnology.Triangle"> 
     <property name="type" value="Test Value Injection"></property> 
     <property name = "c"> 
      <idref bean= "cycle"/> 
     </property> 
     <constructor-arg index="0" value="Test Name"></constructor-arg> 
     <constructor-arg index = "1" value="20"></constructor-arg> 
    </bean> 
    <bean id="cycle" class = "org.dxc.javatechnology.Cycle"> 
     <property name = "radir" value = "5" /> 
    </bean> 
</beans>  

Triangle.java：

package org.dxc.javatechnology; 

public class Triangle { 
    private String type; 
    private Cycle c; 
    private String name; 
    private int height; 

    public int getHeight() { 
     return height; 
    } 
    public Triangle(){} 
    public Triangle(String name) 
    { 
     this.name = name; 
    } 

    public Triangle(String name,int height) 
    { 
     this.name = name; 
     this.height = height; 
    } 
    public String getName() { 
     return name; 
    } 
    public void setName(String name) { 
     this.name = name; 
    } 
    public Cycle getC() { 
     return c; 
    } 
    public void setC(Cycle c) { 
     this.c = c; 
    } 
    public String getType() { 
     return type; 
    } 
    public void setType(String type) { 
     this.type = type; 
    } 
    public void draw(){ 
     System.out.println(getType() + " Triangle drawn"); 
    } 
} 

Cycle.java

package org.dxc.javatechnology; 

public class Cycle { 
    private int radir; 

    public int getRadir() { 
     return radir; 
    } 

    public void setRadir(int radir) { 
     this.radir = radir; 
    } 
}  

主要方法：

public static void main(String[] args) { 
    @SuppressWarnings("resource") 
    ApplicationContext context = new ClassPathXmlApplicationContext("ConfigurationFiles/spring.xml"); 
    Triangle triangle = (Triangle) context.getBean("triangle"); 
    triangle.draw(); 
    System.out.println(triangle.getC().getRadir()); 
    System.out.println(triangle.getName()); 
    System.out.println(triangle.getHeight()); 
}   

誤差如下：

Apr 08, 2017 11:16:03 AM org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh 
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@497470ed: startup date [Sat Apr 08 11:16:03 CST 2017]; root of context hierarchy 
Apr 08, 2017 11:16:03 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions 
INFO: Loading XML bean definitions from class path resource [ConfigurationFiles/spring.xml] 
Apr 08, 2017 11:16:03 AM org.springframework.context.support.ClassPathXmlApplicationContext refresh 
WARNING: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'triangle' defined in class path resource [ConfigurationFiles/spring.xml]: Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'java.lang.String' to required type 'org.dxc.javatechnology.Cycle' for property 'c'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String' to required type 'org.dxc.javatechnology.Cycle' for property 'c': no matching editors or conversion strategy found 
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'triangle' defined in class path resource [ConfigurationFiles/spring.xml]: Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'java.lang.String' to required type 'org.dxc.javatechnology.Cycle' for property 'c'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String' to required type 'org.dxc.javatechnology.Cycle' for property 'c': no matching editors or conversion strategy found 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:564) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) 
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) 
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) 
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) 
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) 
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866) 
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542) 
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139) 
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83) 
    at org.dxc.javatechnology.DrwaingApp.test3(DrwaingApp.java:32) 
    at org.dxc.javatechnology.DrwaingApp.main(DrwaingApp.java:10) 
Caused by: org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'java.lang.String' to required type 'org.dxc.javatechnology.Cycle' for property 'c'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String' to required type 'org.dxc.javatechnology.Cycle' for property 'c': no matching editors or conversion strategy found 
    at org.springframework.beans.AbstractNestablePropertyAccessor.convertIfNecessary(AbstractNestablePropertyAccessor.java:605) 
    at org.springframework.beans.AbstractNestablePropertyAccessor.convertForProperty(AbstractNestablePropertyAccessor.java:617) 
    at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:216) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.convertForProperty(AbstractAutowireCapableBeanFactory.java:1577) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1536) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1276) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553) 
    ... 12 more 
Caused by: java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String' to required type 'org.dxc.javatechnology.Cycle' for property 'c': no matching editors or conversion strategy found 
    at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:306) 
    at org.springframework.beans.AbstractNestablePropertyAccessor.convertIfNecessary(AbstractNestablePropertyAccessor.java:590) 
    ... 18 more 

我不知道什麼問題，誰能幫助我？

Answer 1

這不是idref它只是ref：

<property name = "c" ref = "cycle"/>