自动装配不春季工作4

Question

我有在Spring 3.2.6工作，但在4.0.1

public interface RunTest<T extends Number> { 
void run(T number); 

} 

public class BasicRunTest implements RunTest<Integer>{ 

@Override 
public void run(Integer number) { 
} 

} 

@Component 
public class BeanTest { 
@Autowired 
private RunTest<Number> runTest; 
} 

如果我运行该应用程序我得到的异常不起作用以下来源例如：

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.test.RunTest] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} 

Answer 1

这是一个新的Spring Feature: Spring now treats generic types as a form of qualifier when injecting Beans - 或换句话说：autowire注意泛型类型！

你有BasicRunTest implements RunTest<Integer>（整数），并要求弹簧@Autowire prive RunTest<Number> runTest;（数量） - 这是不兼容的！

尝试

private RunTest<? extends Number> runTest; 

（即它与Spring 3.x的工作，或多或少是一个错误，因为你的代码打破通用约束）