I work for an ISP and in about three years nobody had asked us about anything¹ more complicated than a simple PHP hosting with FTP access. (We don't really advertise hosting solutions, though, as this is not our main business.)
If you want your ISP to support something like Java or Rails — ask them today. They probably won't offer it now (or - who knows - they may surprise you!), but unless they're a type of company where individual client feedback gets lost, they'll note your request.
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¹) Except for a colocated hosting, to be precise. But that's completely another case.
I work for an ISP and in about three years nobody had asked us about anything¹ more complicated than a simple PHP hosting with FTP access. (We don't really advertise hosting solutions, though, as this is not our main business.)
If you want your ISP to support something like Java or Rails — ask them today. They probably won't offer it now (or - who knows - they may surprise you!), but unless they're a type of company where individual client feedback gets lost, they'll note your request.
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¹) Except for a colocated hosting, to be precise. But that's completely another case.