How to use IDEA for JAR packaging (class library)?

as shown in the title, instead of packaging JAVA applications, you package custom tool class files. How does idea package?

Mar.13,2021

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-64f5-1eacc8e-2100.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1eacc8e-2100.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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