FOSS java library to generate *.mobi ebooks?

Firstly there is an almost identical question but the answer is not really satisfactory.

Is there a Java or Ruby library for generating MOBI ebook documents?

The answer basically gives a link to amazon and discusses using command line tools which is not really satisfactory for a web app. I want a regular jar file w/ an api that i can invoke without any nasty process invocation.

Does anyone know of a FOSS library that provides this functionality ? I would rathe开发者_JS百科r simething like ITEXT that allows me to build the document and then writes the mobi file rather than something that converts an already ready PDF into the MOBI.

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The best I've been able to find is a ruby library called KindleR. https://github.com/josh/kindler

I've only used it to convert basic HTML pages to mobi with pretty good success. I've never converted anything with more complicated formatting, so YMMV.