How do I add the JDK classpath to a compiler configuration? I was calling

configureJdkClasspathRoots()

but it no-ops when the JDK is Java 9+, presumably due to the switch to modules and the disappearance of

rt.jar

. It seems like there's helpers for adding module roots given I know the path. Is it just my responsibility to do the JDK lookup, check for modular, and then conditionally do one or the other?

In CLI mode filling the

CompilerConfiguration

is spread across a lot of different places, and it's hard to find all required places So I recommend to check JvmEnvironmentConfigurator class, which setups all required fields for configuration in tests (including different JDK) in one place