Play项目执行mvn clean install时遇java.lang.UnsupportedOperationException错误求助

问题场景 #

执行mvn clean install构建Play项目时，抛出如下错误：

java.lang.UnsupportedOperationException: Position.start on class scala.reflect.internal.util.OffsetPosition
    at scala.reflect.internal.util.Position.start(Position.scala:114)
    at sbt.internals.parser.SbtParser.sbt$internals$parser$SbtParser$$convertStatement$1(SbtParser.scala:148)
    at sbt.internals.parser.SbtParser$$anonfun$4.apply(SbtParser.scala:153)
    at sbt.internals.parser.SbtParser$$anonfun$4.apply(SbtParser.scala:153)
    at scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:251)
    at scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:251)
    at scala.collection.immutable.List.foreach(List.scala:318)
    at scala.collection.TraversableLike$class.flatMap(TraversableLike.scala:251)
    at scala.collection.AbstractTraversable.flatMap(Traversable.scala:105)
    at sbt.internals.parser.SbtParser.splitExpressions(SbtParser.scala:153)
    at sbt.internals.parser.SbtParser.<init>(SbtParser.scala:58)
    at sbt.EvaluateConfigurations$.splitExpressions(EvaluateConfigurations.scala:226)
    at sbt.EvaluateConfigurations$.parseConfiguration(EvaluateConfigurations.scala:69)
    at sbt.EvaluateConfigurations$.evaluateSbtFile(EvaluateConfigurations.scala:106)
    at sbt.Load$.sbt$Load$$loadSettingsFile$1(Load.scala:789)
...

当前使用sbt版本为0.13.18，~/.sbt/repositories配置如下：

[repositories]
  local
  sbt-releases-repo: https://repo.typesafe.com/typesafe/ivy-releases/, [organization]/[module]/(scala_[scalaVersion]/)(sbt_[sbtVersion]/)[revision]/[type]s/[artifact](-[classifier]).[ext]
  sbt-plugins-repo: https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/, [organization]/[module]/(scala_[scalaVersion]/)(sbt_[sbtVersion]/)[revision]/[type]s/[artifact](-[classifier]).[ext]
  maven-central: https://repo1.maven.org/maven2/

解决方案 #

这个错误本质是sbt 0.13.x与高版本Scala编译器的兼容性问题，OffsetPosition.start方法在部分Scala版本中被禁用，以下是可行的解决步骤：

• 匹配Scala与sbt版本：sbt 0.13.18仅兼容Scala 2.10.x或2.11.x版本，禁止使用Scala 2.12及以上版本。检查项目build.sbt或pom.xml中的scala.version配置，确保版本匹配。

• 清理sbt缓存：缓存损坏也可能导致依赖拉取异常，执行以下命令清理缓存后重新构建：

  rm -rf ~/.sbt/boot/
  rm -rf ~/.ivy2/cache/
  mvn clean install
  

• 调整仓库配置（可选）：如果依赖拉取缓慢或失败，可替换为国内镜像加速，修改~/.sbt/repositories：

  [repositories]
    local
    aliyun-maven: https://maven.aliyun.com/repository/public/
    sbt-releases-repo: https://repo.typesafe.com/typesafe/ivy-releases/, [organization]/[module]/(scala_[scalaVersion]/)(sbt_[sbtVersion]/)[revision]/[type]s/[artifact](-[classifier]).[ext]
    sbt-plugins-repo: https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/, [organization]/[module]/(scala_[scalaVersion]/)(sbt_[sbtVersion]/)[revision]/[type]s/[artifact](-[classifier]).[ext]
  

• 升级sbt版本（推荐）：sbt 0.13.x已停止维护，升级到1.x系列版本（如1.9.x）可彻底解决这类兼容性问题。修改项目project/build.properties文件：

  sbt.version=1.9.6
  

内容的提问来源于stack exchange，提问作者Shiva Reddy