An error is reported when idea writes JSP code, but it is solved by normal operation

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First of all ,jsp It is a very old technology , Used less , But it's hard to avoid contact .

When you write jsp Code , You may find that IDEA Report errors , however , It works , such as ：out.print() sentence , You're going to report a mistake , But it is normal for you to run the code .

How to solve

Let's open this page .

such , That's all right. , Just make sure .