Theres not much out there free.  You could invoke it via com wrappers, but I
cant recall if you can still register the class as a com object.   The best
approach is either with a wrapper (webservice is a very easy way to wrap the
class in JSP), or with a bridge http://www.jnbridge.com/index3.htm

This looks promising but its not free.
http://www.j2dotnet.com/J2DotNetWebProd/JBind2DNWeb2/default.htm

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Regards

John Timney
Microsoft Regional Director
Microsoft MVP