Captcha on BSP using java is possible? Java allowed in BSP?

Hello to all,
My client ask for a captcha on a BSP page of autoregister of SRM module. I have found the posts using PHP
[https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/4e539c30-0501-0010-3291-a4c4193a6414|https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/4e539c30-0501-0010-3291-a4c4193a6414]
[/people/eddy.declercq/blog/2005/09/13/die-mensch-maschine|/people/eddy.declercq/blog/2005/09/13/die-mensch-maschine]
but now the client wants to be made with Java. Is possible to introduce a java call into BSP? i dont think so but you can confirm.
Thanks for all,
Nacho

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