@Resource in Spring do not work?

i am new with the Spring Framework and I tried the following example:

First I created two very simple classes

public class ObjectA {

    @Override
    public String toString() {
        return "I am ObjectA";
    }
}

public class ObjectB {
    @Override
    public String toString() {
        return "I am ObjectB";
    }
}

No I want to use this Classes managed by Spring. So I made another Class which uses the @Resource (javax.annotation.Resource) Annotiation for wiring the two Objects.

public class MyApp {

    @Resource
    public ObjectA oa;

    @Resource
    public ObjectB ob;

    public void info() {
        System.out.println("--------------");
        System.out.println(oa);
        System.out.println("--------------");
        System.out.println(ob);
        System.out.println("--------------");

    }

    public static void main( String[] args ) {
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("mySpringConfig.xml");
        System.out.println(applicationContext.getBean( ObjectA.class ));
        System.out.println(applicationContext.getBean( ObjectB.class ));
        MyApp myApp = applicationContext.getBean( MyApp.class );
        myApp.info();
    }

}

The mySpringConfig.xml contains this:

[..]
<bean id="objectA" class="com.mySpringCompany.ObjectA" />
<bean id="objectb" class="com.mySpringCompany.ObjectB" />
<bean id="myApp" class="com.mySpringCompany.MyApp" />
[..]

Now when I run the Main-Method of MyApp I get the following:

I am ObjectA
I am ObjectB
--------------
null
--------------
null
--------------

So when I directly use applicationContext.getBean( ObjectA.class ) in the main-method I get an instance of ObjectA. When I want to get within the MyApp Object it doesn't work. But I think Spring should have injected the two Objects in the MyApp class. What does i made wrong? Thanks in advance for every help.