Spring @Autowired constructor gives No default constructor found

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...

What happens if you use ApplicationContext instead of XmlBeanFactory? I see XmlBeanFactory is deprecated in 3.1, maybe that's one of the reasons. — soulcheck, Dec 01 '11 at 01:25

score 1 · Accepted Answer · edited May 23 '17 at 12:33

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

edited May 23 '17 at 12:33

Community

1
1

answered Dec 01 '11 at 01:42

soulcheck

36,297
6
91
90

score 0 · Answer 2 · answered Jan 01 '17 at 13:19

I get the same error message but have different problem. I was using XML configuration and put @Autowired on class constructor.

I fixed this problem by enabling annotation driven config in my XML configuration file:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.0.xsd">


    <context:annotation-config/>

score 0 · Answer 3 · answered Dec 01 '11 at 01:28

0

Try using

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

That should force Spring to use that constructor. Otherwise it builds a list of constructors and picks the best candidate. Apparently it really wants a default constructor as a candidate, I guess.

Reference: http://static.springsource.org/spring/docs/2.5.x/api/org/springframework/beans/factory/annotation/AutowiredAnnotationBeanPostProcessor.html

answered Dec 01 '11 at 01:28

Nialscorva

2,924
2
15
16

8

I can't imagine how this could ever help when the default value for `required` is `true`. I.e. `@Autowired` == `@Autowired(required=true)` – Jan Zyka May 13 '15 at 09:53

score 0 · Answer 4 · answered Dec 02 '11 at 21:51

0

Create an inteface for the component and try to autowire the interface and nore the class with the autowired contructor.

answered Dec 02 '11 at 21:51

Kfir Bloch

68
2
6

Spring @Autowired constructor gives No default constructor found

4 Answers4