A solution is not provided here, but a troubleshooting solution is provided.
Today, the leader asked me to change the requirements of a system. The project ended as soon as it was pulled down and started, as follows. There is no error message, and it is impossible to troubleshoot, as follows:
Check the error method: perform try-catch in the startup class, as follows:
Start again, as follows:
After successfully locating the error problem, it turned out to be a cache problem, and then you can solve it by yourself according to the error report.