Having the same problem, I researched this, and I found many solutions. After installing the tools for the Web Tool, I was able to get the .jsp editor. It is important to know that you must close your .jsp files and then open it again, or you can be sure that the solution is not working. You can confirm that the web tool installation worked if you go to the following:
Window β Settings In the list of options you will see "General". Expand this menu. Expand the "Editors" menu. Click on the option "Link files" There will be a "file type" (I use Keleper) with a list of different file types. In this list, select .jsp. In this list you should see a list of editors. Select the JSP editor. Then click OK.
This is what I discovered while trying to make mine work.
Growing flea
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