Is it possible to use javax.interceptor in a Java SE environment?

Question

I need to use AOP to solve a particular issue, but it is a small standalone Java program (no Java EE container).

Can I use javax.interceptor functiona

Answer 1

You can use CDI in Java SE but you have to provide your own implementation. Here's an example using the reference implementation - Weld:

package foo;
import org.jboss.weld.environment.se.Weld;

public class Demo {
  public static class Foo {
    @Guarded public String invoke() {
      return "Hello, World!";
    }
  }

  public static void main(String[] args) {
    Weld weld = new Weld();
    Foo foo = weld.initialize()
        .instance()
        .select(Foo.class)
        .get();
    System.out.println(foo.invoke());
    weld.shutdown();
  }
}

The only addition to the classpath is:

  org.jboss.weld.se
  weld-se
  1.1.10.Final

The annotation:

package foo;
import java.lang.annotation.*;
import javax.interceptor.InterceptorBinding;

@Inherited @InterceptorBinding
@Retention(RetentionPolicy.RUNTIME)
@Target({ ElementType.METHOD, ElementType.TYPE })
public @interface Guarded {}

Interceptor implementation:

package foo;
import javax.interceptor.*;

@Guarded @Interceptor
public class Guard {
  @AroundInvoke
  public Object intercept(InvocationContext invocationContext) throws Exception {
    return "intercepted";
  }
}

Descriptor:

    
        foo.Guard