Phi*_*EUR 5 spring dependency-injection guice spring-boot
在我的应用程序中,我有两个具有相同名称的类,但当然位于不同的包中。
这两个类都需要注入到应用程序中;不幸的是,我收到以下错误消息:
Caused by: org.springframework.context.annotation.ConflictingBeanDefinitionException: Annotation-specified bean name 'myFeature' for bean class [org.pmesmeur.springboot.training.service.feature2.MyFeature] conflicts with existing, non-compatible bean definition of same name and class [org.pmesmeur.springboot.training.service.feature1.MyFeature]
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我的问题可以通过以下示例重现:
@Component
@EnableConfigurationProperties(ServiceProperties.class)
public class MyService implements IService {
private final ServiceProperties serviceProperties;
private final IProvider provider;
private final org.pmesmeur.springboot.training.service.feature1.IMyFeature f1;
private final org.pmesmeur.springboot.training.service.feature2.IMyFeature f2;
@Autowired
public MyService(ServiceProperties serviceProperties,
IProvider provider,
org.pmesmeur.springboot.training.service.feature1.IMyFeature f1,
org.pmesmeur.springboot.training.service.feature2.IMyFeature f2) {
this.serviceProperties = serviceProperties;
this.provider = provider;
this.f1 = f1;
this.f2 = f2;
}
...
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package org.pmesmeur.springboot.training.service.feature1;
public interface IMyFeature {
void print();
}
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package org.pmesmeur.springboot.training.service.feature1;
import org.springframework.stereotype.Component;
@Component
public class MyFeature implements IMyFeature {
@Override
public void print() {
System.out.print("HelloWorld");
}
}
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package org.pmesmeur.springboot.training.service.feature2;
public interface IMyFeature {
void print();
}
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package org.pmesmeur.springboot.training.service.feature2;
import org.springframework.stereotype.Component;
@Component
public class MyFeature implements IMyFeature {
@Override
public void print() {
System.out.print("FooBar");
}
}
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如果我为我的课程使用不同的名称MyFeature,我的问题就会消失!
我习惯使用 Guice,这个框架没有这种问题/限制
似乎 spring 依赖项注入框架仅使用类名而不是包名 + 类名来选择其类。
在“现实生活”中,我在一个更大的项目中遇到了这个问题,我强烈希望不必重命名我的类:任何人都可以帮助我吗?
最后一点,我宁愿避免“技巧”,例如
@Qualifier(value = "ABC")在注入我的类时使用:在我的示例中,查找正确的实例不应该有歧义,MyFeature因为它们没有实现相同的接口
您可以为每个组件分配一个值,例如@Component(value="someBean"),然后用@Qualifier例如注入它
@Autowired
public SomeService(@Qualifier("someBean") Some s){
//....
}
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