Spring boot oracle driver at runtime - spring-boot

I have a spring boot app that I am trying to add an oracle connection to. I have already added an #Entity class and Repository.
I have added the oracle ojdbc8.jar to my local maven repo and have this in gradle
dependencies {
...
compile group: 'com.oracle', name: 'ojdbc8', version:'12.2.0'
compile group: 'org.springframework.boot', name: 'spring-boot-starter-data-jpa', version: '1.5.3.RELEASE'
...
}
my application.properties contains
spring.datasource.url="jdbc:oracle:thin:#//hostname.whatever:1521/blah"
spring.datasource.username="username"
spring.datasource.password="password"
spring.datasource.driver-class-name="oracle.jdbc.OracleDriver"
This all compiles fine. But when I deploy (under tomcat) I get
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration': Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Tomcat.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.tomcat.jdbc.pool.DataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.IllegalStateException: Cannot load driver class: "oracle.jdbc.OracleDriver"
Looks like it's having trouble finding the driver. Is there something else I need to do to make it know where to find it? Or to build it as part of the archive?
I also built a similar test app and pointed it at a local mysql just to make sure I wasn't crazy and that works fine... Not sure what's so special about oracle.

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Can I also suggest you format your code in a code block to make for easier reading

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