> + * Class VirtualDiskImage
> + *
> + * @author Andrea Turli
> + * @see <a href= 
> "http://sldn.softlayer.com/reference/datatypes/SoftLayer_Virtual_Disk_Image"/>
> + */
> +public class VirtualDiskImage {
> +
> +   public static Builder<?> builder() {
> +      return new ConcreteBuilder();
> +   }
> +
> +   public Builder<?> toBuilder() {
> +      return new ConcreteBuilder().fromVirtualDiskImage(this);
> +   }
> +
> +   public abstract static class Builder<T extends Builder<T>>  {

If the builder is not going to be subclassed, don't make it abstract and remove 
the `ConcreteBuilder`.

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