[英]Autowiring doesn't work in Spring 4
我有以下源示例,該示例在Spring 3.2.6中可用,但在4.0.1中不可用
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;
}
如果我運行該應用程序,則會出現異常:
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)}
這是Spring的一項新功能:在注入Bean時,Spring現在將泛型類型視為限定符的一種形式 -換句話說:自動裝配要注意泛型!
您有BasicRunTest implements RunTest<Integer>
(Integer)並向spring請求@Autowire prive RunTest<Number> runTest;
(數字)-不兼容!
嘗試
private RunTest<? extends Number> runTest;
(它與Spring 3.x一起使用,或多或少是一個錯誤,因為您的代碼違反了通用約束)
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