The class that opened the beans package after spring source code import idea, compilation can not find the core package? As shown in the picture

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I can"t find the class in the core package after import and compilation. What should I do?

Gradle spring java
Mar.21,2021

compiles automatically after importing idea.

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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-64f5-1e587a2-43a63.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e587a2-43a63.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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