A ResourcePool could not acquire a resource from its primary factory or souce的解決辦法

遇到A ResourcePool could not acquire a resource from its primary factory or source主要是數據庫鏈接有問題 1.數據庫驅動配置有誤:driver=com.mysql.jdbc.Driver 2.數據庫鏈接地址有誤:url=jdbc:mysql://localhost:3306/test 3.密碼和帳號有誤:username
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