how the weld container service for application in java se environment?

I am a novice in weld, and through several days exploration but I only know some fundamental concept of weld.

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I'm intended to use weld container in java se environment. And follw What is the easiest way to have CDI and JPA in Java SE? my code segment is below:

public class SayHello {
    public SayHello(){}
       public void sayHello(){
       System.out.println("Hello");
   }
}

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import javax.inject.Inject;
import org.jboss.weld.environment.se.Weld;
import org.jboss.weld.environment.se.WeldContainer;

public class UseInject {
    private SayHello obj;
    public UseInject(){}

    @Inject
    public UseInject(SayHello obj){
        this.obj = obj;
    }

    public void show(){
        obj.sayHello();
    }

    public static void main(String[] args){
         Weld weld = new Weld();
         WeldContainer container = weld.initialize();
         UseInject ui = container.instance().select(UseInject.class).get();
         ui.show();
         weld.shutdown();
    }
  } 

and my application is based on maven. Here is the jar dependency segment in pom.xml

 <dependency>
    <groupId>org.jboss.weld.se</groupId>
    <artifactId>weld-se-core</artifactId>
    <version>3.0.0.Alpha17</version>

my intention is inject SayHello object into UseInject Object so the final output of this application is "Hello". But things are not so smooth, the jvm report the follow error:

and through search from internet,there is a saying that build a empty beans.xml is ok, and I follow it can't make effect. And as for the main method I imitate What is the easiest way to have CDI and JPA in Java SE? I don't know what thing it do, and What is the easiest way to have CDI and JPA in Java SE? use the @Produces annotation, I don't know whether I should use it too. And I had intended use it for the SayHello Class, but I don't know which jar should I import in order to use it,so I give up.

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Now I want to: 1. know how the weld service for se application in other words what things the main method does?

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2. How can I run my application successfully using weld?

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3. when we should use the annotation @Produces

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And I made reference to a number of relevant issues e.g.weld and java seHow to bootstrap weld-se in a JUnit testetc. but find they are all to senior for me. thanks for your attention advance.

2. How can I run my application successfully using weld?

The error message is telling you that you have to create a file named beans.xml under the directory META-INF. So to solve the problem just do the following:

1. Directory named META-INF under src/main/resources directory
2. Create an empty file named beans.xml under META-INF so that your project is CDI enabled.

3. when we should use the annotation @Produces

You use this annotation if you want to use any Java primitive types such as Integer, String, ... as CDI beans, or any type / class in an external library which does not contain the META-INF/beans.xml file in the classpath.

Example:

public class SayHello {

    @Produces
    private double pi = 3.14159;
    // the rest of the code
}

and you can inject the value of PI in another place in your code as:

public class UseInject {

    @Inject
    private double pi;  // 3.14159 will be injected here

    // the rest of the code

    public static void main(...) {
        // ....
        UseInject ui = container.instance().select(UseInject.class).get();
        ui.show();
        System.out.println(ui.pi);
        // ...
    }

The value 3.14159 should be displayed on the console.