This article gives you a comprehensive understanding of Java object serialization and deserialization>>>

Problem Description: when I finished the test on the virtual machine, in the process of clearing the project in the environment, the file system was damaged due to misoperation. Some log files became read-only files and could not be deleted. This error was reported. The specific cause of misoperation will be analyzed later

The problem is: RM: cannot remove ` 03/03a707c4dce673e63218917d710388. Cache ‘: read only file system

Solution:

Then run RM - RF again, and you won't be prompted to read only file system