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You don't mention what format the source files are in, so I'm assuming that you only have access to the actual .chm files and not whatever those were created from. Given that, you'll need a tool that is capable of backward converting Help output into some source format, and then converting that to JavaHelp. I don't know of anything that would convert directly from .chm to JavaHelp.
I believe that RoboHelp is capable of taking Window Help output and converting it backwards to source, and it is also supports JavaHelp, so this would be one tool to investigate.
HelpBreeze is another tool that supports both formats and is also a lot cheaper that RoboHelp.
I apologize for not having first-hand experience with either of these. We currently use a CMS tool, AuthorIT, to single source publish to JavaHelp and other outputs.