How to force Scala to use a different library version? - scala

Question

After adding
libraryDependencies += "org.scalatest" %% "scalatest" % "3.0.0" % "test"
to build.sbt, and refreshed the project, I got this msg.
SBT project import
[warn] Multiple dependencies with the same organization/name but
different versions. To avoid conflict, pick one version:
[warn] * org.scala-lang.modules:scala-xml_2.11:(1.0.5, 1.0.4)
Changing the above to
libraryDependencies ++= Seq(
"org.scalatest" %% "scalatest" % "3.0.0" % "test"
exclude("org.scala-lang", "scala-reflect")
exclude("org.scala-lang.modules", "scala-xml_2.11")
)
solves the issue. However, instead of excluding scala-xml_2.11 version 1.0.5 from scalatest, I would like to force the scala compiler to use scala-xml_2.11 version 1.0.5 instead of version 1.0.4. (I researched the versions at https://mvnrepository.com.) Thus I tried substituting scalaVersion := "2.11.8" for
libraryDependencies ++= Seq(
"org.scala-lang" % "scala-reflect" % "2.11.8",
"org.scala-lang.modules" % "scala-xml_2.11" % "1.0.5"
)
This however results in
SBT project import
[warn] Binary version (2.11) for dependency
org.scala-lang#scala-reflect;2.11.8
[warn] in default#myproject$sources_javadoc_2.10;1.0 differs
from Scala binary version in project (2.10).
[warn] Binary version (2.11) for dependency
org.scala-lang#scala-library;2.11.8
[warn] in default#myproject$sources_javadoc_2.10;1.0 differs
from Scala binary version in project (2.10).
[warn] Multiple dependencies with the same organization/name but
different versions. To avoid conflict, pick one version:
[warn] * org.scala-lang:scala-library:(2.11.8, 2.10.4)
[warn] * org.scala-lang:scala-reflect:(2.11.8, 2.10.4)
[warn] [FAILED ]
com.artima.supersafe#supersafe_2.10.4;1.1.0!supersafe_2.10.4.jar(src):
(0ms)
[warn] ==== local: tried
[warn]
/home/user/.ivy2/local/com.artima.supersafe/supersafe_2.10.4/1.1.0/srcs/supersafe_2.10.4-sources.jar
[warn] ==== activator-local: tried [warn] /Development/Activator/activator-dist-1.3.10/repository/com.artima.supersafe/supersafe_2.1...
(show balloon)
What am I supposed to do?
Edit: What else I tried and did not work:
scalaVersion := "2.11.8"
libraryDependencies ++= Seq(
"org.scala-lang" % "scala-reflect" % scalaVersion.value,
"org.scala-lang.modules" %% "scala-xml" % "1.0.5"
)
// ScalaTest
libraryDependencies += "org.scalatest" %% "scalatest" % "3.0.0" % "test"
[warn] Multiple dependencies with the same organization/name but
different versions. To avoid conflict, pick one version: [warn] *
org.scala-lang.modules:scala-xml_2.11:(1.0.5, 1.0.4)
scalaVersion := "2.11.8"
libraryDependencies ++= Seq(
"org.scala-lang" % "scala-reflect" % scalaVersion.value,
"org.scala-lang.modules" %% "scala-xml_2.11" % "1.0.5"
)
// ScalaTest
libraryDependencies += "org.scalatest" %% "scalatest" % "3.0.0" % "test"
Error:Error while importing SBT project:...[info]
Resolving org.scala-sbt#run;0.13.8 ... [info] Resolving
org.scala-sbt#task-system;0.13.8 ... [info] Resolving
org.scala-sbt#tasks;0.13.8 ... [info] Resolving
org.scala-sbt#tracking;0.13.8 ... [info] Resolving
org.scala-sbt#cache;0.13.8 ... [info] Resolving
org.scala-sbt#testing;0.13.8 ... [info] Resolving
org.scala-sbt#test-agent;0.13.8 ... [info] Resolving
org.scala-sbt#test-interface;1.0 ... [info] Resolving
org.scala-sbt#main-settings;0.13.8 ... [info] Resolving
org.scala-sbt#apply-macro;0.13.8 ... [info] Resolving
org.scala-sbt#command;0.13.8 ... [info] Resolving
org.scala-sbt#logic;0.13.8 ... [info] Resolving
org.scala-sbt#precompiled-2_8_2;0.13.8 ... [info] Resolving
org.scala-sbt#precompiled-2_9_2;0.13.8 ... [info] Resolving
org.scala-sbt#precompiled-2_9_3;0.13.8 ... [trace] Stack trace
suppressed: run 'last *:update' for the full output. [trace] Stack
trace suppressed: run 'last :ssExtractDependencies' for the full
output. [error] (:update) sbt.ResolveException: unresolved
dependency: org.scala-lang.modules#scala-xml_2.11_2.11;1.0.5: not
found [error] (*:ssExtractDependencies) sbt.ResolveException:
unresolved dependency:
org.scala-lang.modules#scala-xml_2.11_2.11;1.0.5: not found [error]
Total time: 4 s, completed 01.10.2016 17:46:55
scalaVersion := "2.11.8"
libraryDependencies ++= Seq(
"org.scala-lang" % "scala-reflect" % scalaVersion.value,
"org.scala-lang.modules" %% "scala-xml" % "1.0.5"
)
// ScalaTest
libraryDependencies ++= Seq(
"org.scalatest" %% "scalatest" % "3.0.0" % "test"
exclude("org.scala-lang", "scala-reflect")
exclude("org.scala-lang.modules", "scala-xml")
)
[warn] Multiple dependencies with the same organization/name but
different versions. To avoid conflict, pick one version: [warn] *
org.scala-lang.modules:scala-xml_2.11:(1.0.5, 1.0.4)
My build.sbt
name := "MyProject"
version := "0.1.0"
scalaVersion := "2.11.8"
libraryDependencies ++= Seq(
"org.scala-lang" % "scala-reflect" % scalaVersion.value,
"org.scala-lang.modules" %% "scala-xml" % "1.0.5"
)
// ScalaTest
//libraryDependencies += "org.scalactic" %% "scalactic" % "3.0.0"
//libraryDependencies += "org.scalatest" %% "scalatest" % "3.0.0" % "test"
libraryDependencies ++= Seq(
"org.scalatest" %% "scalatest" % "3.0.0" % "test"
exclude("org.scala-lang", "scala-reflect")
exclude("org.scala-lang.modules", "scala-xml_2.11")
)

Answer 1

The way to exclude specific transitive dependency is this:
Run sbt evicted to figure out which of the project dependencies is pulling in outdated library, let's assume the problematic library is: com.typesafe.slick.
Add the following exclude (the parentheses are important):
("com.typesafe" %% "slick" % "3.1.1").exclude("org.scala-lang.modules", "scala-xml_2.11")
Add this normally as you would be listing dependencies.
This will prevent sbt from including any version of scala-xml that was coming in as a transitive dependency of Slick.

Answer 2

Don't substitute; you need both scalaVersion and libraryDependencies.
Though use
scalaVersion := "2.11.8"
libraryDependencies ++= Seq(
"org.scala-lang" % "scala-reflect" % scalaVersion.value,
"org.scala-lang.modules" %% "scala-xml" % "1.0.5"
)
to avoid bugs when you eventually change scalaVersion.
By removing scalaVersion you get default scalaVersion := "2.10.4" (with your version/settings of SBT, at least) but your libraryDependencies still require 2.11.