You could create a plugin with a web-filter module. In this filter you would catch all requests to the "you can't view this issue" page and redirected to your own page.
You can find more info about the web-filter module here:
@Alexey Matveev _Appfire_ I am having a hard time, i followed a few tutorials and the servlet filter tutorial as well, but it does not seem to do anything at all. when i go to the hello world page it just gives a 404. I've been searching around but cannot find any resources to expand on the tutorial.
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