NoSuchBeanDefinitionException: No bean named 'name' is defined

1
votes

I am trying a very basic example. I tried to see other stack overflow answers, but couldn't solve this problem. I am new to this space, let me know if I left out anything.

Here is my error log :

Dec 11, 2017 8:40:20 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions INFO: Loading XML bean definitions from class path resource [BeanDefinition.xml] Exception in thread "main" org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'MySpringBeanWithDepenency' is defined at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:638) at org.springframework.beans.factory.support.AbstractBeanFactory.getMergedLocalBeanDefinition(AbstractBeanFactory.java:1159) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:282) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:195) at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:973) at model.main.Main.main(Main.java:18)

which clearly says it cannot find the MySpringBeanWithDepenency

Here is my BeanDefinition.xml

<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns:aop="http://www.springframework.org/schema/aop"
   xmlns:context="http://www.springframework.org/schema/context"
   xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
       http://www.springframework.org/schema/aop
       http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-2.5.xsd">

<context:component-scan base-package="model.testbean" />
<context:component-scan base-package="model.writer" />

this is my main class :

package model.main;

/**
 * Created by barora on 12/10/2017.
 */

import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import model.testbean.MySpringBeanWithDepenency;

public class Main {
    public static void main(String args[]){
        ApplicationContext context = new ClassPathXmlApplicationContext(
                "BeanDefinition.xml");
        BeanFactory factory = context;
        MySpringBeanWithDepenency test = (MySpringBeanWithDepenency) factory.getBean("MySpringBeanWithDepenency");
        test.run();
    }
}

this is my MySpringBeanWithDepenency

package model.testbean;

/**
 * Created by barora on 12/10/2017.
 */

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.stereotype.Component;

import model.writer.IWriter;
import org.springframework.stereotype.Service;


@Service
public class MySpringBeanWithDepenency {

    private IWriter writer;

    @Autowired
    public void setWriter(IWriter writer){
        this.writer = writer;
    }

    public void run(){
        String s = "This is my test";
        writer.writer(s);
    }
}

this is my folder structure :

enter image description here

3
javaspringspring-mvc
You've included imports in your quoted code, but not package. Does your class file begin with package model.testbean;? – slim
By the way, every time I see depenency instead of dependency, it jolts me out of being able to concentrate on the code. – slim
I added the code with package. Regarding the depenency, the world is imperfect my friend. You'll have to live with and die with this great sorrow. – Bhavya Arora
Well, one day you'll mis-spell a variable name, and the person who knows the answer won't read your question because of it. – slim

3 Answers

4
votes

Try to debug adding:

System.out.println("Bean names: " + Arrays.toString(context.getBeanNamesForType(MySpringBeanWithDependency.class)));

If this prints an empty list, then you have an issue with your classpath scanning. If it prints a name, then that's a name you can use to get the bean.

Alternatively, instead of factory.getBean(String name) use factory.getBean(MySpringBeanWithDependency.class), so that you don't need to know what name Spring has given your bean.

1
votes

Try MySpringBeanWithDepenency test = (MySpringBeanWithDepenency) factory.getBean(MySpringBeanWithDepenency.class);

EDITED

So I've recreated code using given project structure. It works with exception that I've used following code for IWriter

  package model.writer;

    public interface IWriter {

        void writer(String s);
    }

and for implementation 

package model.writer;

import org.springframework.stereotype.Component;

@Component
public class NiceWriter implements IWriter {
    public void writer(String s) {

    }
}

EDITED 2 If you want to have two implementation for IWriter interface and both supposed to be spring managed beans you need to help spring container to decide which one you want it to autowire. Use @Qualifier for this. See tutorial for details

0
votes

The default bean name is mySpringBeanWithDepenency with "m" you should use 

MySpringBeanWithDepenency test = (MySpringBeanWithDepenency)factory.getBean("mySpringBeanWithDepenency");