Druid 使用 druid连接池
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2022-03-02 16:56:49
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druid链接之后不释放，导致链接数据库超时，由于原来使用的是1.016的版本，需要升级到最新的版本，这个是druid的一个bug。升级最新版本解决问题
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 490 milliseconds ago. The last packet sent successfully to the server was 489 milliseconds ago.
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 490 milliseconds ago. The last packet sent successfully to the server was 489 milliseconds ago.
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