How to develop a component plugin from scratch and i need some examples and guidance how it works
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And what is the reason to not just build that in Appian? A dynamic UI based on a JSON definition is not exactly simple, but way easier than what you envision.
Actual requirement is need to develop a plugin using java and react
Well ... if this is your requirement ...
I suggest to make yourself familiar with the Appian extension SDK and start to build things based on the available documentation, examples and existing plugins.
Once you have more specific questions, we are happy to support.