Is is possible to add Logic in foem through java, how easy difficult it is to create and re-use component in formbuilder

My question is fairly Anylatical. I am in search of frame-work that allows me to add/remove, show/hide fields on the fly. I have seen in demo that form builder do exactly the same.
But their are Certain questions:

1) Can I add java Logic to these fields?? If yes how ?? (please give some link of tutorial for same)
2) How easy/difficult it would be to create custom component in Orbeon-form builder??
3) What is the difficulty level of calling a webservice from a form generated by form builder??


Detail Description on what I want to achieve:

I have a product in hand. I want to allow users to add/remove some fields, while others will be kept mandatory . I need to add java logic(business-logic) in compulsary fields but other fields can be kept as such.
This removes the pain work of adding removing fields from code, It would be great if I am able to do the same in integration with liferay

Thank You

Some answers below:

> My question is fairly Anylatical. I am in search of frame-work that allows me
> to add/remove, show/hide fields on the fly. I have seen in demo that form
> builder do exactly the same.
> But their are Certain questions:
>
> 1) Can I add java Logic to these fields?? If yes how ?? (please give some
> link of tutorial for same)

The logic is expressed with XPath expressions. You can call static
methods on Java objects from XPath expressions (although this is not
recommended):

xmlns:foo="java:my.package.MyClass"

calculate="foo:doStuff()"

> 2) How easy/difficult it would be to create custom component in Orbeon-form
> builder??

Did you check the XBL guide:

http://wiki.orbeon.com/forms/doc/developer-guide/xbl-components-guide

> 3) What is the difficulty level of calling a webservice from a form
> generated by form builder??

It's possible: Form Builder has a simple service editor:

http://wiki.orbeon.com/forms/doc/user-guide/form-builder-user-guide#TOC-Advanced:-services-and-actions

Or, you can create your own xforms:submission by hand in the form's source.

Probably anything that sends/receive XML can be made to work.

-Erik


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