Load .RData from an R script in Scala using Renjin - r

Question

I have an R script load.R that attempts to do
load("test.RData")
When I run:
engine.eval(new FileReader("load.R"))
An exception occurs:
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
I don't know R. I'm merely attempting to use R code to process some data in a Java/Scala application using Renjin.
Reading the data section on the documention nothing is said about loading data from .RData files.
UPDATED:
In my build.sbt file I have:
resolvers += "BeDataDriven" at https://nexus.bedatadriven.com/content/groups/public",
libraryDependencies += "org.renjin" % "renjin-script-engine" % "0.8.1886"

Answer 1

It is not enough to just have renjin-script-engine.jar on your classpath, you need its dependencies as well.
If you are using SBT to build your Scala project, then you need to add the following to your build file:
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"
)
For other build tools, see:
http://docs.renjin.org/en/latest/library/project-setup.html

Answer 2

The problem was coursier not being able to resolve all dependencies (without any notice).
Removing addSbtPlugin("io.get-coursier" % "sbt-coursier" % "1.0.0-M15") from plugins.sbt and using sbt's default resolver fixed the issue.