我正在尝试将Mule连接到一个MySQL数据库,使用本教程(在Mule中非常新):Failed to route event via endpoint: DefaultOutboundEndpoint{endpointUri=jdbc://name="MySQL_Data_Source" user="$(db.user)" password="$(db.password)"
at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:174) ~[mysql-connector-java:64) ~[mysql-connector-java-8.0.20.jar:8.0.20]
at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:836) ~[mysql-connector-j