I have set up my custom error pages in Tomcat 7 (running from eclipse). For testing that they work I can simply misspell a url and get my custom page 404 error, however I am not sure how I can replicate the following errors.
Apologies, but I am a bit confused. I am interested in the response I get from my server. I need something that I can use in the browser to say cause a page 500 error so I can see how my custom error 500 page looks. Can I do this with response.sendError(-)?
You can't simply use your browser to trigger a server error (especially in 5xx series), unless you make your web app do that. Since you seem to have access to your codebase, you can make a test servlet that calls response.sendError(500); in its doGet(-) method, which will trigger a 500 error when that servlet is 'called' from your browser. You can see how your custom error pages look like with that.