Connections could not be acquired from the underlying database!

报错信息：realm = plexus.core strategy = org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy Number of foreign imports: 0 （中间省略） Caused by: org.unidal.dal.jdbc.datasource.DataSourceException: Error when connecting to JDBC data source(cat) with properties (driver=com.mysql.jdbc.Driver, url= jdbc:mysql://10.0.4.6:3306/cat ? useUnicode=true&characterEncoding=utf8&useSSL=false&autoReconnect=true&socketTimeout=120000 , user=root). Error message=java.sql.SQLException: Connections could not be acquired from the underlying database! at org.unidal.dal.jdbc.datasource.JdbcDataSource.initialize(JdbcDataSource.java:99)

环境：腾讯云 CentOS 7.6； mysql5.7.44 ；tomcat8.5； github下载的3.0.1war包部署启动 datasource.xml配置如图 哪位大佬能帮这个问题咋解。。？我把mysql降级到5.6版本还是报这个错。。