SpringMvc access report 404, error will be reported when Tomcat is closed

just started the SpringMVC, development tool for IDEA, to write according to the sample code, the code should be no problem

run the program: clipboard.png
404
:clipboard.png

the jre configured by tomcat is consistent with the jre in the system environment
I really don"t know what went wrong

Aug.30,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1eaae60-2010.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1eaae60-2010.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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