Scala version warning for scala-java8-compat_2.12:0.8.0

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Scala version warning for scala-java8-compat_2.12:0.8.0



I am using scala 2.12.1 for a project built with maven but am getting version warnings like the one below:


[WARNING] org.scala-lang.modules:scala-java8-compat_2.12:0.8.0 requires scala version: 2.12.0
[WARNING] Multiple versions of scala libraries detected!



What can I do to get the versioning right here? From what I understand these are libraries scala itself brings in and not explicitly defined by me. I get the same for xml lib too.


xml




1 Answer
1



To get rid of such warnings just add this to the <configuration> block of the <maven-scala-plugin> definition in your pom.xml:


<configuration>


<maven-scala-plugin>


<scalaCompatVersion>${scala.compat.version}</scalaCompatVersion>



And add <scala.compat.version>2.12</scala.compat.version> to the <properties> section.


<scala.compat.version>2.12</scala.compat.version>


<properties>



These warnings may be safely discarded unless major or minor versions differ. As stated here:



We guarantee forwards and backwards compatibility of the "org.scala-lang" % "scala-library" % "2.N.x" and "org.scala-lang" % "scala-reflect" % "2.N.x" artifacts



Also, to find out how some library appeared in one's project dependencies, one can use:


$ mvn dependency:tree






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