Java 找不到匹配的编辑器或转换策略
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时间：2020-08-14 15:54:55 来源:igfitidea点击:
no matching editors or conversion strategy found
提问by rajeev pani..
I am new to spring.I got this exception.I googled but I did not find the exact solution for this can anyone point out where is the mistake..
我是春天的新手。我得到了这个例外。我用谷歌搜索，但我没有找到确切的解决方案，谁能指出错误在哪里..
app-context.xml
应用上下文.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-3.2.xsd">
<bean class="com.listinjection.Course" id="course">
<property name="course">
<list value-type="java.lang.String">
<value>c</value>
<value>c++</value>
<value>java</value>
<value>web services</value>
</list>
</property>
</bean>
<bean class="com.mapinjection.University" id="university">
<property name="university">
<map key-type="java.lang.String" value-type="com.mapinjection.Course">
<entry key="java" value-ref="course">
</entry>
</map>
</property>
</bean>
</beans>
Course.java
课程.java
package com.mapinjection;
import java.util.List;
public class Course {
private List<String> course;
public void setCourse(List<String> course) {
this.course = course;
}
public void display(){
System.out.println("list of courses are:");
for(String s:course){
System.out.println(s);
}
}
}
University.java
大学.java
package com.mapinjection;
import java.util.Map;
public class University {
private Map<String, Course> university;
public void setUniversity(Map<String, Course> university) {
this.university = university;
}
public void display(){
Course course1=university.get("java");
course1.display();
}
}
Test.java
测试.java
package com.mapinjection;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
"com/mapinjection/app-context.xml");
University university=context.getBean("university", University.class);
university.display();
context.close();
}
}
exception
例外
Jul 25, 2014 10:09:15 AM org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@15d2aa14: startup date [Fri Jul 25 10:09:15 IST 2014]; root of context hierarchy
Jul 25, 2014 10:09:15 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [com/mapinjection/app-context.xml]
Jul 25, 2014 10:09:15 AM org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@614951ff: defining beans [course,university]; root of factory hierarchy
Jul 25, 2014 10:09:15 AM org.springframework.beans.factory.support.DefaultListableBeanFactory destroySingletons
INFO: Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@614951ff: defining beans [course,university]; root of factory hierarchy
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'university' defined in class path resource [com/mapinjection/app-context.xml]: Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'java.util.LinkedHashMap' to required type 'java.util.Map' for property 'university'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [com.listinjection.Course] to required type [com.mapinjection.Course] for property 'university[java]': no matching editors or conversion strategy found
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:529)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
at org.springframework.beans.factory.support.AbstractBeanFactory.getObject(AbstractBeanFactory.java:293)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:290)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:191)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:633)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
at com.mapinjection.Test.main(Test.java:9)
Caused by: org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'java.util.LinkedHashMap' to required type 'java.util.Map' for property 'university'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [com.listinjection.Course] to required type [com.mapinjection.Course] for property 'university[java]': 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:1464)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1423)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1159)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
... 11 more
Caused by: java.lang.IllegalStateException: Cannot convert value of type [com.listinjection.Course] to required type [com.mapinjection.Course] for property 'university[java]': no matching editors or conversion strategy found
at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:267)
at org.springframework.beans.TypeConverterDelegate.convertToTypedMap(TypeConverterDelegate.java:648)
at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:208)
at org.springframework.beans.BeanWrapperImpl.convertIfNecessary(BeanWrapperImpl.java:448)
... 17 more
In the entire code I have not used LinkedHashMap but why It is saying " Failed to convert property value of type 'java.util.LinkedHashMap' to required type 'java.util.Map' for property 'university'"
在整个代码中，我没有使用 LinkedHashMap 但为什么它说“无法将类型 'java.util.LinkedHashMap' 的属性值转换为属性 'university' 所需的类型 'java.util.Map'”
采纳答案by Sotirios Delimanolis
You are trying to add a value of type com.listinjection.Courseto a Mapthat expects com.mapinjection.Coursevalues.
您正在尝试将类型的值添加com.listinjection.Course到Map需要com.mapinjection.Course值的 a 。
<map key-type="java.lang.String" value-type="com.mapinjection.Course">
<entry key="java" value-ref="course">
Correct that.
纠正那个。
