jrapidoc-rest-plugin/src/main/java/org/jboss/resteasy/spi/metadata/ResourceBuilder.java
public static ResourceConstructor constructor(Class<?> annotatedResourceClass) {
        Constructor constructor = PickConstructor.pickPerRequestConstructor(annotatedResourceClass);
        if (constructor == null) {
            throw new RuntimeException("Could not find constructor for class: " + annotatedResourceClass.getName());
        }
        ResourceConstructorBuilder builder = rootResource(annotatedResourceClass).constructor(constructor);
        if (constructor.getParameterTypes() != null) {
            for (int i = 0; i < constructor.getParameterTypes().length; i++)
                builder.param(i).fromAnnotations();
        }
        return builder.buildConstructor().buildClass().getConstructor();
    }
public static ResourceConstructor constructor(Class<?> annotatedResourceClass) {
        Constructor constructor = PickConstructor.pickPerRequestConstructor(annotatedResourceClass);
        if (constructor == null) {
            throw new RuntimeException("Could not find constructor for class: " + annotatedResourceClass.getName());
        }
        ResourceConstructorBuilder builder = rootResource(annotatedResourceClass).constructor(constructor);
        if (constructor.getParameterTypes() != null) {
            for (int i = 0; i < constructor.getParameterTypes().length; i++)
                builder.param(i).fromAnnotations();
        }
        return builder.buildConstructor().buildClass().getConstructor();
    }
Picks a constructor from an annotated resource class based on spec rules

@param annotatedResourceClass
@return