Question

Some strange behavior from Spring 3.0 here.

package com.service.schedule;

import org.springframework.stereotype.Component;

@Component("outroJob")
public class OutroJob {

    public void printMe() {
        System.out.println("running...");
    }

}

and

package com.service.schedule;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;
import org.springframework.stereotype.Component;

@Component("testeAutowired")
public class TesteAutowired {

    @Autowired
    public TesteAutowired(OutroJob outroJob) {
        outroJob.printMe();
    }

    public static void main(String[] args) {
        ClassPathResource res = new ClassPathResource("applicationContext.xml");
        XmlBeanFactory ctx = new XmlBeanFactory(res);

        OutroJob outroJob = (OutroJob) ctx.getBean("outroJob");
        outroJob.printMe(); // gives: running...

        ctx.getBean("testeAutowired");
    }
}

None of these beans are declared on applicationContext.xml

So, line outroJob.printMe(); works fine… prints “running…”

But when I try to get the “testeAutowired” bean, it says:

Could not instantiate bean class
[com.service.schedule.TesteAutowired]: No default constructor found;
nested exception is java.lang.NoSuchMethodException:
com.service.schedule.TesteAutowired.

The question is: why, if Spring found the “outroJob” bean it doesn’t autowired it on the TesteAutowired constructor ?

It seems obvious what it has to do…

Answer 1

Try using ApplicationContext instead of XmlBeanFactory. XmlBeanFactory doesn’t postprocess annotations ie doesn’t use AutowiredAnnotationBeanPostProcessor which would explain the behaviour you’re experiencing.

Here’s some more explanation