I'm newish to SBT and am not sure what to do about a rather scary warning from the evicted
task: [warn] There may be incompatibilities among your library dependencies; run 'evicted' to see detailed eviction warnings.
The full task output is...
sbt:Sprout> evicted
[info] Updating ...
[info] Done updating.
[warn] There may be incompatibilities among your library dependencies; run 'evicted' to see detailed eviction warnings.
[warn] Found version conflict(s) in library dependencies; some are suspected to be binary incompatible:
[warn] * org.scala-lang.modules:scala-xml_2.12:1.1.0 is selected over 1.0.6
[warn] +- org.json4s:json4s-xml_2.12:3.6.3 (depends on 1.1.0)
[warn] +- org.scalatra:scalatra_2.12:2.6.5 (depends on 1.0.6)
[warn] +- com.typesafe.play:twirl-api_2.12:1.3.13 (depends on 1.0.6)
[info] Here are other dependency conflicts that were resolved:
[info] * org.json4s:json4s-core_2.12:3.6.5 is selected over 3.6.3
[info] +- org.json4s:json4s-jackson_2.12:3.6.5 (depends on 3.6.5)
[info] +- org.json4s:json4s-xml_2.12:3.6.3 (depends on 3.6.3)
[info] +- org.scalatra:scalatra-json_2.12:2.6.5 (depends on 3.6.3)
[info] * org.json4s:json4s-scalap_2.12:3.6.5 is selected over 3.6.3
[info] +- org.json4s:json4s-core_2.12:3.6.5 (depends on 3.6.5)
[info] +- org.json4s:json4s-core_2.12:3.6.3 (depends on 3.6.3)
[info] * org.json4s:json4s-ast_2.12:3.6.5 is selected over 3.6.3
[info] +- org.json4s:json4s-core_2.12:3.6.5 (depends on 3.6.5)
[info] +- org.json4s:json4s-core_2.12:3.6.3 (depends on 3.6.3)
[success] Total time: 1 s, completed Apr 13, 2019 12:53:54 PM
"suspected binary incompatible" sound serious. Is it?
Is there just some exclude that I can tag onto the dependencies to get the dependencies in agreement as to what the correct versions are?
The SBT dependencies are like...
libraryDependencies ++= Seq(
"org.scalatra" %% "scalatra" % ScalatraVersion exclude("org.slf4j","slf4j-api"),
"org.scalatra" %% "scalatra-scalatest" % ScalatraVersion % "test",
"org.slf4j" % "slf4j-api" % "1.7.26",
"ch.qos.logback" % "logback-classic" % "1.2.3" % "runtime",
"org.eclipse.jetty" % "jetty-webapp" % "9.4.9.v20180320" % "container",
"javax.servlet" % "javax.servlet-api" % "3.1.0" % "provided",
"org.scalatra" %% "scalatra-json" % ScalatraVersion,
"org.json4s" %% "json4s-jackson" % "3.6.5",
)
This warning appears because org.scalatra:scalatra_2.12:2.6.5
& com.typesafe.play:twirl-api_2.12:1.3.13
depends on org.scala-lang.modules:scala-xml_2.12:1.0.6
, but org.json4s:json4s-xml_2.12:3.6.3
uses org.scala-lang.modules:scala-xml_2.12:1.1.0
In order to hide this warning, you can use dependencyOverrides
:
dependencyOverrides += "org.scala-lang.modules" % "scala-xml_2.12" % "1.0.6"
Again, it will just hide the warning, but it doesn't guarantee compatibility between your libraries and the version you set.
Ideally we should resolve evection warnings instead of override, if at all possible, due to potentially introducing hard-to-trace bugs. In this case it is possible if we are willing to drop scalatra
and json4s-jackson
versions to 2.6.4
and 3.5.2
, respectively, like so:
val ScalatraVersion = "2.6.4"
libraryDependencies ++= Seq(
"org.scalatra" %% "scalatra" % ScalatraVersion exclude("org.slf4j","slf4j-api"),
"org.scalatra" %% "scalatra-scalatest" % ScalatraVersion % "test",
"org.slf4j" % "slf4j-api" % "1.7.26",
"ch.qos.logback" % "logback-classic" % "1.2.3" % "runtime",
"javax.servlet" % "javax.servlet-api" % "3.1.0" % "provided",
"org.scalatra" %% "scalatra-json" % ScalatraVersion,
"org.json4s" %% "json4s-jackson" % "3.5.2",
)
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