我正在使用弹簧 3.2.2。我在spring中使用util：list标签注入集合（ArrayList）时遇到问题。我有以下bean定义
package com.springaction.testmultidimesionalcollection;
import java.util.List;
/**
* @author jinesh
*
*/
public class Address {
List<Country> country;
public List<Country> getCountry() {
return country;
}
/**
* @param country the country to set
*/
public void setCountry(List<Country> country) {
this.country = country;
}
}
下面是我正在使用的弹簧配置文件。
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd"
>
<bean id="address" class="com.springaction.testmultidimesionalcollection.Address">
<property name="country">
<util:list list-class="java.util.ArrayList" value-type="com.springaction.testmultidimesionalcollection.Country">
<list>
<ref bean="countryChina"/>
<ref bean="countryIndia"/>
<ref bean="countryAus"/>
</list>
</util:list>
</property>
</bean>
<bean id="countryChina" class="com.springaction.testmultidimesionalcollection.Country">
<property name="countryName" value="China" />
</bean>
<bean id="countryIndia" class="com.springaction.testmultidimesionalcollection.Country">
<property name="countryName" value="India" />
</bean>
<bean id="countryAus" class="com.springaction.testmultidimesionalcollection.Country">
<property name="countryName" value="Australia" />
</bean>
</beans>
我尝试使用以下代码对此进行测试。
package com.springaction.testmultidimesionalcollection;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**
* @author jinesh
*
*/
public class TestMultiDimensionalMain {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
ApplicationContext context = new ClassPathXmlApplicationContext("com/springaction/testmultidimesionalcollection/testmultidimensionalcollection.xml");
Address addrs=(Address)context.getBean("address");
System.out.println("address size:" + addrs.getCountry().size());
}
}
但是当它尝试加载弹簧配置文件时出现以下异常。
Caused by: org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'java.util.ArrayList' to required type 'java.util.List' for property 'country'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [java.util.ArrayList] to required type [com.springaction.testmultidimesionalcollection.Country] for property 'country[0]': no matching editors or conversion strategy found
at org.springframework.beans.BeanWrapperImpl.convertIfNecessary(BeanWrapperImpl.java:463)
at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:494)
at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:488)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.convertForProperty(AbstractAutowireCapableBeanFactory.java:1439)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1398)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1134)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:522)
... 11 more
Caused by: java.lang.IllegalStateException: Cannot convert value of type [java.util.ArrayList] to required type [com.springaction.testmultidimesionalcollection.Country] for property 'country[0]': no matching editors or conversion strategy found
at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:264)
at org.springframework.beans.TypeConverterDelegate.convertToTypedCollection(TypeConverterDelegate.java:559)
at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:199)
at org.springframework.beans.BeanWrapperImpl.convertIfNecessary(BeanWrapperImpl.java:448)
... 17 more
我不明白为什么春天会给出这样的例外？我是否错过了弹簧配置中的某些内容？