If you are using Jacob from within some web applications handled by Tomcat, you must not put jacob.jar in the WEB-INF/lib directories of the webapps.
If you fail to comply, the first application using a given dll will work; subsequent webapps will fail with a message like "already loaded in another classloader".
Putting jacob.jar in the common/lib directory solves the problem (there is only one classloader for common/lib).
BUT! You ought to put this simple facts in the UsingJacob.html file! please!
This problem is quite difficult to identify, and I think is quite common (lots of unanswered questions in the forums).
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