我有一个应用上下文的层次结构。在父上下文中定义的Bean依赖于在子上下文中定义的Bean。以下是它的样子:
public class X {
public static class A {
public B b;
public void setB(B b) { this.b = b; }
}
public static class B { }
public static void main(String[] args) {
ClassPathXmlApplicationContext parent = new ClassPathXmlApplicationContext(
"/a.xml");
go1(parent);
}
public static void go1(ClassPathXmlApplicationContext parent) {
GenericApplicationContext child = new GenericApplicationContext(parent);
child.getBeanFactory().registerSingleton("b", new B());
A a = (A) child.getBean("a");
Assert.assertNotNull(a.b);
}
}
定义"a" bean的xml文件如下所示:
<?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-2.5.xsd">
<bean id="a" class="X$A" autowire="byName" lazy-init="true"/>
</beans>
问题在于B未被注入到A中。只有在将“b”单例与父级注册时才会发生注入,而这在我的程序中不是可选项。
有什么想法吗?