http://nexus.sonatype.org/oss-repository-hosting.html/vertx-parent/vertx-codegen: Sonatype helps open source projects to set up Maven repositories on https://oss.sonatype.org/ (Eclipse) 
package io.vertx.codegen.annotations;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;


Declares a fluent method return type when the method returns the type of the class declaring this method
or a sub type.

/**
 * Declares a fluent method return type when the method returns the type of the class declaring this method
 * or a sub type.
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface Fluent {
}