SSM project controller layer calls static method to report an error

The controller layer of the SSM project calls the util tool class written by oneself. In the tool class, some static methods in some jar packages are invoked, and
runs up to report errors. Br> solution: add the jar package to the modules directory in the project
idea operation:
. Add through dependencies of modules:
1. Open file – & gt; Project Structure (Ctrl + Shift + Alt + S)

2. Click modules – & gt; Dependencies -> “+” -& gt; “ Jars or directories”

3. Select the project jar package
4. Apply – & gt; OK

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