如果您的问题已经把百度的方法都试过还没有解决，试试查看自己在关于数据库连接的地方找找看有么有不小心写错了什么。
我的原因：mapper有错
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启动错误笔记：DruidDriver] but failed to unregister it when the web application was stopped,To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
Tomcat出现To prevent a memory leak, the JDBC Driver has been forcibly unregistered.问题的一种情况记录
GlassFish To prevent a memory leak, the JDBC Driver has been forcibly unregistered
Tomcat运行一段时间后，自动停止关闭，To prevent a memory leak,Druid 数据库连接自动关闭， the JDBC Driver has been forcibly unregistered.
registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
The web application registered the JDBC driver * but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
解决：The web application [] registered the JDBC driver [] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
tomcat启动部署APP报错：This is very likely to create a memory leak
严重: The web application [] registered the JDBC driver [com.microsoft.sqlserver.jdbc.SQLServerDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDB