具有spark依赖关系的Scalatra应用程序返回java.lang.NoSuchFieldError:实例，原因是多个httpclient版本

我正在尝试构建一个Scalatra应用程序，它运行带有spark的代码。实际上，我可以使用

sbt assembly

构建胖jar，并且端点可以工作，但是当使用

org.scalatra.test.scalatest.运行测试时，我得到以下错误：

*** RUN ABORTED ***
  java.lang.NoSuchFieldError: INSTANCE
  at org.apache.http.conn.ssl.SSLConnectionSocketFactory.<clinit>(SSLConnectionSocketFactory.java:146)
  at org.apache.http.impl.client.HttpClientBuilder.build(HttpClientBuilder.java:964)
  at org.scalatra.test.HttpComponentsClient$class.createClient(HttpComponentsClient.scala:100)
  at my.package.MyServletTests.createClient(MyServletTests.scala:5)
  at org.scalatra.test.HttpComponentsClient$class.submit(HttpComponentsClient.scala:63)
  at my.package.MyServletTests.submit(MyServletTests.scala:5)
  at org.scalatra.test.Client$class.post(Client.scala:62)
  at my.package.MyServletTests.post(MyServletTests.scala:5)
  at org.scalatra.test.Client$class.post(Client.scala:60)
  at my.package.MyServletTests.post(MyServletTests.scala:5)
  ...

你找到解决办法了吗
val scalatraVersion = "2.6.5"

// scalatra
libraryDependencies ++= Seq(
  "org.scalatra"  %% "scalatra"           % scalatraVersion,
  "org.scalatra"  %% "scalatra-scalatest" % scalatraVersion % "test",
  "org.scalatra"  %% "scalatra-specs2"    % scalatraVersion,
  "org.scalatra"  %% "scalatra-swagger"   % scalatraVersion,
  "ch.qos.logback" % "logback-classic"    % "1.2.3" % "runtime",
  "org.eclipse.jetty" % "jetty-webapp"    % "9.4.9.v20180320" % "container;compile",
  "javax.servlet"  % "javax.servlet-api"  % "3.1.0" % "provided"
)

// From other projects:
// spark
libraryDependencies ++= Seq(
    "org.apache.spark" %% "spark-core" % "2.4.0",
    "org.apache.spark" %% "spark-mllib" % "2.4.0",
    "org.apache.spark" %% "spark-sql" % "2.4.0"
)

// scalatest
libraryDependencies += "org.scalatest" % "scalatest_2.11" % "3.0.5" % "test"