Spring Boot application fails to start when using MySql R2DBC driver

[sntp]

Describe the bug

I’m trying to use the reactive MySQL driver instead of JDBC, and CfEnv has logic to identify which driver is being used, MySQL or MariaDB. It relies on the presence of specific JDBC drivers in the classpath. Since I’m using R2DBC, it doesn’t find any drivers and later trows an NPE, as a result the application fails to start.

20:12:37.561 [main] ERROR org.springframework.boot.SpringApplication -- Application run failed
java.lang.NullPointerException: Cannot invoke "String.equals(Object)" because the return value of "io.pivotal.cfenv.jdbc.MySqlJdbcUrlCreator.getDriverClassName()" is null
        at io.pivotal.cfenv.jdbc.MySqlJdbcUrlCreator.createJdbcUrl(MySqlJdbcUrlCreator.java:81)
        at io.pivotal.cfenv.jdbc.CfJdbcUrlCreator.<init>(CfJdbcUrlCreator.java:45)
        at io.pivotal.cfenv.jdbc.CfJdbcEnv.findJdbcServices(CfJdbcEnv.java:34)
        at io.pivotal.cfenv.spring.boot.CfDataSourceEnvironmentPostProcessor.postProcessEnvironment(CfDataSourceEnvironmentPostProcessor.java:75)
        at org.springframework.boot.env.EnvironmentPostProcessorApplicationListener.onApplicationEnvironmentPreparedEvent(EnvironmentPostProcessorApplicationListener.java:132)
        at org.springframework.boot.env.EnvironmentPostProcessorApplicationListener.onApplicationEvent(EnvironmentPostProcessorApplicationListener.java:115)
        at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:185)
        at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:178)
        at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:156)
        at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:138)
        at org.springframework.boot.context.event.EventPublishingRunListener.multicastInitialEvent(EventPublishingRunListener.java:136)
        at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:81)
        at org.springframework.boot.SpringApplicationRunListeners.lambda$environmentPrepared$2(SpringApplicationRunListeners.java:64)
        at java.base/java.lang.Iterable.forEach(Unknown Source)
        at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:118)
        at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:112)
        at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:63)
        at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:353)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:313)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1361)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1350)
        at com.example.Application.main(Application.java:24)
        at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
        at java.base/java.lang.reflect.Method.invoke(Unknown Source)
        at org.springframework.boot.loader.launch.Launcher.launch(Launcher.java:102)
        at org.springframework.boot.loader.launch.Launcher.launch(Launcher.java:64)
        at org.springframework.boot.loader.launch.JarLauncher.main(JarLauncher.java:40)
Exit status 1

Reproduction steps

1. Create spring web flux application which uses MySql and r2dbc (Sorry, I don't have time to provide working example)
2. Deploy to PCF

Expected behavior

CfEnv supports r2dbc

Additional context

As a work-around I added jdbc driver to the classpath for now.