Eclipse project files are not all displayed in package explorer


what should I do if I want the classes folder to be displayed in Package Explorer?

after using it for a period of time, it has been found that it has something to do with the configuration of project, but it hasn"t been found out yet.

Feb.28,2021

Refresh.

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-64f5-1b31d31-2b12a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b31d31-2b12a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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