使用 Renjin 从 Scala 中的 R 脚本加载 .RData

Question

我有一个 R 脚本 load.R 尝试这样做

load("test.RData")

当我跑步时：

engine.eval(new FileReader("load.R"))

发生异常：

   Exception in thread "main" java.lang.NoClassDefFoundError: org/tukaani/xz/XZInputStream
    at org.renjin.primitives.io.connections.Connections.gzfile(Connections.java:79)
    at org.renjin.primitives.R$primitive$gzfile.doApply(R$primitive$gzfile.java:75)
    at org.renjin.primitives.R$primitive$gzfile.apply(R$primitive$gzfile.java:36)
    at org.renjin.primitives.special.InternalFunction.apply(InternalFunction.java:45)
    at org.renjin.eval.Context.evaluateCall(Context.java:302)
    at org.renjin.eval.Context.evaluate(Context.java:222)
    at org.renjin.eval.Context.evaluate(Context.java:163)
    at org.renjin.sexp.Closure.doApply(Closure.java:83)
    at org.renjin.eval.ClosureDispatcher.apply(ClosureDispatcher.java:73)
    at org.renjin.eval.ClosureDispatcher.applyClosure(ClosureDispatcher.java:58)
    at org.renjin.sexp.Closure.apply(Closure.java:78)
    at org.renjin.eval.Context.evaluateCall(Context.java:302)
    at org.renjin.eval.Context.evaluate(Context.java:222)
    at org.renjin.primitives.special.AssignLeftFunction.assignLeft(AssignLeftFunction.java:57)
    at org.renjin.primitives.special.AssignLeftFunction.apply(AssignLeftFunction.java:41)
    at org.renjin.eval.Context.evaluateCall(Context.java:302)
    at org.renjin.eval.Context.evaluate(Context.java:222)
    at org.renjin.primitives.special.BeginFunction.apply(BeginFunction.java:38)
    at org.renjin.eval.Context.evaluateCall(Context.java:302)
    at org.renjin.eval.Context.evaluate(Context.java:222)
    at org.renjin.primitives.special.IfFunction.apply(IfFunction.java:40)
    at org.renjin.eval.Context.evaluateCall(Context.java:302)
    at org.renjin.eval.Context.evaluate(Context.java:222)
    at org.renjin.primitives.special.BeginFunction.apply(BeginFunction.java:38)
    at org.renjin.eval.Context.evaluateCall(Context.java:302)
    at org.renjin.eval.Context.evaluate(Context.java:222)
    at org.renjin.eval.Context.evaluate(Context.java:163)
    at org.renjin.sexp.Closure.doApply(Closure.java:83)
    at org.renjin.eval.ClosureDispatcher.apply(ClosureDispatcher.java:73)
    at org.renjin.eval.ClosureDispatcher.applyClosure(ClosureDispatcher.java:58)
    at org.renjin.sexp.Closure.apply(Closure.java:78)
    at org.renjin.eval.Context.evaluateCall(Context.java:302)
    at org.renjin.eval.Context.evaluate(Context.java:222)
    at org.renjin.eval.Context.evaluateExpressionVector(Context.java:285)
    at org.renjin.eval.Context.evaluate(Context.java:220)
    at org.renjin.script.RenjinScriptEngine.eval(RenjinScriptEngine.java:145)
    at org.renjin.script.RenjinScriptEngine.eval(RenjinScriptEngine.java:104)
    at com.infosistema.imp.restservice.data_treatment.DataTreatment.<init>(DataTreatment.scala:34)
    at com.infosistema.imp.restservice.data_treatment.Main$.<init>(DataTreatment.scala:45)
    at com.infosistema.imp.restservice.data_treatment.Main$.<clinit>(DataTreatment.scala)
    at com.infosistema.imp.restservice.data_treatment.Main.main(DataTreatment.scala)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
Caused by: java.lang.ClassNotFoundException: org.tukaani.xz.XZInputStream
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 46 more

我不知道 R。我只是尝试使用 R 代码在使用 Renjin 的 Java/Scala 应用程序中处理一些数据。

阅读documention 上的数据部分，没有提到从.RData 文件加载数据。

更新： 在我的build.sbt 文件中，我有：

resolvers += "BeDataDriven" at https://nexus.bedatadriven.com/content/groups/public",
libraryDependencies += "org.renjin" % "renjin-script-engine" % "0.8.1886"

Answer 1

在你的类路径中只有 renjin-script-engine.jar 是不够的，你还需要它的依赖项。

如果您使用 SBT 构建您的 Scala 项目，那么您需要将以下内容添加到您的构建文件中：

resolvers +=
  "BeDataDriven" at "https://nexus.bedatadriven.com/content/groups/public"

lazy val root = (project in file(".")).
  settings(
    name := "renjin-test",
    version := "1.0",
    scalaVersion := "2.10.6",
    libraryDependencies += "org.renjin" % "renjin-script-engine" % "0.8.1886"
)

有关其他构建工具，请参阅： http://docs.renjin.org/en/latest/library/project-setup.html

Answer 2

问题是coursier 无法解决所有依赖项（没有任何通知）。

从 plugins.sbt 中删除 addSbtPlugin("io.get-coursier" % "sbt-coursier" % "1.0.0-M15") 并使用 sbt 的默认解析器解决了该问题。