Failed to bind properties under 'spring.datasource.type' to java.lang.Class

刚创建的 Spring Boot 2.0 项目，启动后输出：

Failed to bind properties under 'spring.datasource.type' to java.lang.Class<javax.sql.DataSource>:

    Property: spring.datasource.type
    Value: org.apache.tomcat.jdbc.pool.DataSource
    Origin: class path resource [application.properties]:5:24
    Reason: No converter found capable of converting from type [java.lang.String] to type [java.lang.Class<javax.sql.DataSource>]

Action:

Update your application's configuration

1.5 的项目可以使用

spring.datasource.type=org.apache.tomcat.jdbc.pool.DataSource

但2.0 却不行，那就把它删除，默认配置为：

tomcat-jdbc