How it works...

Since the earlier chapters, HikariCP data source pooling has been used because of its fast performance when it comes to complex JDBC transactions. Spring Boot 2.0 has decided to use HikariCP as the default data source pooling to replace the Tomcat JDBC connection pooling. Also, auto-wiring a java.sql.DataSource bean object is no lonhger allowed in Spring Boot development, since it can already perform automatic constructor injection of @Bean to any component class.

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