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spring-kafka

Why does spring-kafka depend on kotlin-stdlib?

Since version 2.7.0 the spring-kafka library pulls the kotlin-stdlib jar.

This is pom version 2.6.9 not having such dependency: https://repo1.maven.org/maven2/org/springframework/kafka/spring-kafka/2.6.9/spring-kafka-2.6.9.pom

And this is pom version 2.7.0 with the new kotlin dependency: https://repo1.maven.org/maven2/org/springframework/kafka/spring-kafka/2.7.0/spring-kafka-2.7.0.pom

Since there are no .kt files in the main source code I think adding kotlin as a compile dependency is an error. I also excluded it in my project without any issue.

I ask because the github project says to ask in SO when in doubt.
So is this dependency unnecessary and if not what's its purpose?

Solution

  • It is certainly not intentional, the only change I can see in the gradle build script is an update to the kotlin version.

    There is no reference to kotlin-stdlib in build.gradle, only

    testImplementation 'org.jetbrains.kotlin:kotlin-stdlib-jdk8'