@Autowired

[initmax]

Hi all, I have problem with @Autowired.

I have config.xml with this beans

<bean id="HeroDaoImpl" class="com.epos.kernel.spring.model.HeroDaoImpl">  </bean>
    <bean id="Hero" class="com.epos.kernel.spring.model.Hero">  </bean> 

and class

public class MainHero {


    @Autowired
    @Qualifier("HeroDaoImpl")
    private static HeroDaoImpl heroDaoImpl;
    @Autowired
    @Qualifier("Hero")
    private static Hero objHero;

    public static void main(String[] args) {

        ApplicationContext context = new ClassPathXmlApplicationContext("app-config.xml");
        SessionFactory sessionFactory = (SessionFactory) context.getBean("sessionFactory");


        objHero.setName("1231");
                

    }
} 

in IDEA I see link near private static HeroDaoImpl heroDaoImpl; and private static Hero objHero; after click on this link I move into config.xml bean. But if I run my application I have got this exception

Exception in thread "main" java.lang.NullPointerException
    at com.epos.testspring.MainHero.main(MainHero.java:30)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:110) 

exception on this link objHero.setName("1231");
why ? I have method etName, and I add @Autowired

[Marten Deinum]

You cannot inject statics with @Autowired next to that spring only injects beans it knowns about. Your AppMain class isn't a spring managed bean so it is never going to be injected...

[initmax]

ОК. thanks I have changed my class, look it

package com.epos.testspring;

import com.epos.kernel.spring.model.Hero;
import com.epos.kernel.spring.model.HeroDaoImpl;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MainHero {


    @Autowired
    @Qualifier("HeroDaoImpl")
    private HeroDaoImpl heroDaoImpl;
    @Autowired
    @Qualifier("Hero")
    private Hero objHero;

    public static void main(String[] args) {

        MainHero start = new MainHero();
        start.testBeans();

    }


    public Hero testBeans(){

        objHero.setName("1231");

        return objHero;

    }

} 

because error don`t change ((

[Marten Deinum]

As stated spring doesn't know about the bean... You are using your own instance... I suggest a basic spring tutorial on dependency injection.

[initmax]

can you show me example?

[initmax]

Ок, I have changed my class, this work well

public class AutowiredTest {
    @Autowired
    @Qualifier("HeroDaoImpl")
    private HeroDaoImpl heroDaoImpl;

    @Autowired
    @Qualifier("Hero")
    private Hero objHero;

    public Hero testBeans(){

        ApplicationContext context = new ClassPathXmlApplicationContext("app-config.xml");
        SessionFactory sessionFactory = (SessionFactory) context.getBean("sessionFactory");
        
        XmlBeanFactory beanFactory = new XmlBeanFactory(new ClassPathResource("db-config.xml"));

       
        objHero =(Hero) context.getBean("Hero");
        objHero.setChoice("Hello");
        System.out.println(objHero.getChoice());

        
                      

        return objHero;
    }        

} 

but if I add thisline

 heroDaoImpl = (HeroDaoImpl) context.getBean("HeroDaoImpl"); 

want to get contest, I have got this exaption

Exception in thread "main" java.lang.ClassCastException: $Proxy14 cannot be cast to com.epos.kernel.spring.model.HeroDaoImpl
Hello
    at com.epos.testspring.AutowiredTest.testBeans(AutowiredTest.java:34)
    at com.epos.testspring.MainHero.main(MainHero.java:12)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:110) 

Who can help me?

[Marten Deinum]

As I stated earlier I suggest a tutorial (and/or the reference guide)... I suggest especially a tutorial about classes and programming to interfaces (currently you use interfaces, but program to concrete classes).