spring map使用annotation泛型注入问题分析 (三)

Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire method: public void org.springweb.service.impl.HelloServiceImpl.setTypeMap(java.util.Map); nested exception is org.springframework.beans.FatalBeanException: Key type [class java.lang.Integer] of map [java.util.Map] must be assignable to [java.lang.String]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredMethodElement.inject(AutowiredAnnotationBeanPostProcessor.java:589)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:84)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:282)
... 13 more
Caused by: org.springframework.beans.FatalBeanException: Key type [class java.lang.Integer] of map [java.util.Map] must be assignable to [java.lang.String]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:761)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:703)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredMethodElement.inject(AutowiredAnnotationBeanPostProcessor.java:547)

查看spring的代码

[java]
else if (Map.class.isAssignableFrom(type) && type.isInterface()) {
Class keyType = descriptor.getMapKeyType();
if (keyType == null || !String.class.isAssignableFrom(keyType)) {
if (descriptor.isRequired()) {
throw new FatalBeanException("Key type [" + keyType + "] of map [" + type.getName() +
"] must be assignable to [java.lang.String]");
}
return null;
}

else if (Map.class.isAssignableFrom(type) && type.isInterface()) {
Class keyType = descriptor.getMapKeyType();
if (keyType == null || !String.class.isAssignableFrom(keyType)) {
if (descriptor.isRequired()) {
throw new FatalBeanException("Key type [" + keyType + "] of map [" + type.getName() +
"] must be assignable to [java.lang.String]");
}
return null;
}

也就是spring使用Autowired进入注入时，map的key类型只能为string，但是

如果我使用set方法注入后者构造方法注入，map的可以是可以自动转为integer的。