Adding a JDBC driver to Spring Cloud Data Flow server

A quick tech note on how you can add a JDBC driver dependency (jar) to the classpath when launching the spring-cloud-dataflow-server.

The Spring Cloud Data Flow documentation suggests rebuilding (!?!) when you need to add a custom JDBC driver. That seems a bit crazy to me so after a bit of Googling it turns out you can do it using the Spring Boot PropertiesLauncher:

java -cp spring-cloud-dataflow-server-2.2.0.RELEASE.jar -Dloader.path=lib \
   org.springframework.boot.loader.PropertiesLauncher \
   --spring.datasource.url=jdbc:mysql://localhost:3306/y9a?useSSL=false \
   --spring.datasource.username=root \
   --spring.datasource.password=password \
   --spring.datasource.driverClassName=com.mysql.jdbc.Driver

And you simply have to put the JDBC driver jar file in the lib/ directory:

spring-cloud-dataflow-server-2.2.0.RELEASE.jar
lib/
   mysql-connector-java-8.0.17.jar

Disco!