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An extension to spring-mvc to simplify restful application stuff, see https://github.com/Hippoom/rest-helper for more detail.

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package com.github.hippoom.resthelper.annotation;

import java.lang.annotation.*;

@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Command {

    /**
     * Whether body content is required.
     * Default is {@code true}, leading to an exception thrown in case
     * there is no body content. Switch this to {@code false} if you prefer
     * {@code null} to be passed when the body content is {@code null}.
     *
     * @since 3.2
     */
    boolean required() default true;

}