Why is Intellij's editor not recognizing standard JSP tags?

1 week ago 8
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The project runs fine when I deploy it to Tomcat. The problem is the editor: it flags the taglib URL, and the "if" tag, like it's never heard of them.

This is a project that I've been working on for a long time; I'm pretty sure it's not a problem with the project, but with the IDE settings. I must have changed something, but I have no idea what. If it was just changing the color, I could live with that, but now I can't use code completion for tag names or attributes.

screenshot of IDE editor window

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