Cause of the problem
the jar package prompted is occupied by other programs, so it is impossible to repackage and replace the old package

Solution:
1. If the jar package can be run, check whether the jar package is running and end the corresponding process
2. Check whether the read-write permission of the jar package has been changed and give the file read-write permission before operation
3. Check whether other software is editing the jar package file (such as compression software) and exit editing