Error accessing URL 404

Project scenario ：

Tips ： Here is a brief introduction to the background of the project ：
Today, a long-standing problem has been solved

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It is executed in the development environment

Problem description

Tips ： The problems encountered in the project are described here ：
visit url Always 404 error

Cause analysis ：

Tips ： Fill in the analysis of the problem here ：
  Context path of the application. Context path of application , Also called project path , It's the composition url Part of the address .

server:
servlet:
context-path: /myapp1

Solution ：

Tips ： Fill in the specific solution to the problem here ：
I am glad to have solved the problem with the method proposed last time , Try first , Solved by continuous comparison