activiti7与springboot整合启动报错Consider revisiting the entries above or defining a bean of type ‘javax.sql.DataSource’ in your configuration

具体报错信息：

***************************
APPLICATION FAILED TO START
***************************

Description:

Parameter 0 of method springProcessEngineConfiguration in org.activiti.spring.boot.ProcessEngineAutoConfiguration required a bean of type 'javax.sql.DataSource' that could not be found.

The following candidates were found but could not be injected:
- Bean method 'dataSource' in 'JndiDataSourceAutoConfiguration' not loaded because @ConditionalOnProperty (spring.datasource.jndi-name) did not find property 'jndi-name'
- Bean method 'dataSource' in 'XADataSourceAutoConfiguration' not loaded because @ConditionalOnClass did not find required class 'javax.transaction.TransactionManager'

Action:

Consider revisiting the entries above or defining a bean of type 'javax.sql.DataSource' in your configuration.

报这个错，一般是因为框架里需要数据源，但是工程里又没有配置数据源引起的。但是我的pom里已经引入了mysql的驱动包，application.properties文件里也配置了mysql的连接信息，确定无误。但是依然报这个错，百思不得其解。后来仔细对比了网上的一些例子，终于发现了问题所在，那就是pom里只引入mysql的驱动包还不够，还需要引入spring-boot-starter-jdbc包才行。引入此包后问题解决。