Question

我是SBT的新手，不确定从evicted任务：[warn] There may be incompatibilities among your library dependencies; run 'evicted' to see detailed eviction warnings.

中发出一个相当恐怖的警告该怎么办

完整的任务输出是...

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

“怀疑二进制不兼容”听起来很严重。是吗？

是否只有一些排除项，我可以标记依赖项以获得关于正确版本的一致同意？

SBT依赖项就像...

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",
)

Answer 1

出现此警告是因为public final Disposable forEachWhile(final Predicate<? super T> onNext, Consumer<? super Throwable> onError, final Action onComplete)和org.scalatra:scalatra_2.12:2.6.5取决于com.typesafe.play:twirl-api_2.12:1.3.13，但是org.scala-lang.modules:scala-xml_2.12:1.0.6使用org.json4s:json4s-xml_2.12:3.6.3

要隐藏此警告，可以使用org.scala-lang.modules:scala-xml_2.12:1.1.0：

dependencyOverrides

同样，它只会隐藏警告，但不能保证库与您设置的版本之间的兼容性。

Answer 2

理想情况下，由于可能会引入难以跟踪的错误，因此，如果可能的话，我们应该解决隔离警告而不是覆盖警告。在这种情况下，我们可能愿意将json4s-jackson和2.6.4的版本分别降至3.5.2和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", )，就像这样：

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如何克服“可能存在不兼容性...” SBT警告？

2 个答案: