HI, I encountered a wired issue in IDEA 2023 CE when upgraded to the latest Kotlin 1.8.20. In IDEA,

DataBufferUtils.read

returns a

Flux

instead of

Flux<DataBuffer>

, when I moved cursor to the read method, from the java doc popup panen,

can not access 'reactor.core.publisher.Flux' , check your module classpath for missing or conflict dependencies

. I have built the project manually by

gradlew build

, and open the jar file and explore all dependencies in the libs folder, there is no conflict and reactor related the jars are existed in the libs. The

read

is always resolved as an error in IDEA.

val fluxData = DataBufferUtils.read(
            ByteArrayResource(content.toByteArray()),
            DefaultDataBufferFactory(),
            1024
        )

I had a similar problem, and when I downgraded to 2022, it went away.

It should be a bug of the Kotlin support in IntelliJ IDEA