Solution to red exclamation mark appearing in Eclipse project

Situation: A red exclamation mark appears on the project

Solution:

Right-click the project and select Build Path → configure build path

After clicking the configure build path of the eclipse project, in the pop-up window, find the Libraries tab. You can see that some jar packages have red crosses. This The first kind of jar package is the jar package that cannot find the corresponding file. The reason why a red exclamation mark appears in front of the eclipse project, a red exclamation mark appears in front of the eclipse project, and a red exclamation mark appears in front of the eclipse project may be due to the reason. Externally imported projects or some files have been deleted, resulting in red exclamation marks, red exclamation marks, and red exclamation marks. Find the jar packages that are not in these eclipse projects and modify them.

The reason for my error is that I did not select the correct JDK. Click on the error to edit, and then select the current JDK.

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