前提：已经查看jdbc端口，地址，用户名密码全都正确，但是数据库依然连接不上

Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private chances.cms.content.mgmt.autoArrange.ArrangeRuleRepository chances.cms.content.mgmt.autoArrange.ArrangeCategoryTask.arrangeRuleRepository; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'arrangeRuleRepository': Invocation of init method failed; nested exception is org.springframework.jdbc.UncategorizedSQLException: Hibernate operation: Cannot open connection; uncategorized SQLException for SQL [???]; SQL state [null]; error code [0]; Cannot create PoolableConnectionFactory (null,  message from server: "Host '10.30.57.51' is not allowed to connect to this MariaDB server"); nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (null,  message from server: "Host '10.30.57.51' is not allowed to connect to this MariaDB server")

注意到这个：

"Host '10.30.57.51' is not allowed to connect to this MariaDB server"

在填写数据库配置文件时，root用户，用的是ip，也就是写ip是不行的，如果要用ip ，则要赋予权限

解决方案：

1：mysql root 一般允许本机访问 也就是localhost

所以把Ip改为localhost即可

2：创建一个远程访问的用户

grant all privileges on *.* to 'testuser'@'10.30.57.51' identified by 'testpassword' with grant option;解决

[if !supportLists]4.[endif]可以ping到ip地址，ssh 到 服务器地址 ，然后wget -c  tomcat 的地址

也可以ping到，但是tomcat连接不上

解决方法：可能是防火墙开了

systemctl stop firewalld

service iptables stop

关闭防火墙，解决