Github user shivaram commented on a diff in the pull request: https://github.com/apache/spark/pull/16154#discussion_r91164412 --- Diff: core/src/main/scala/org/apache/spark/api/r/RBackendHandler.scala --- @@ -143,12 +142,8 @@ private[r] class RBackendHandler(server: RBackend) val cls = if (isStatic) { Utils.classForName(objId) } else { - JVMObjectTracker.get(objId) match { - case None => throw new IllegalArgumentException("Object not found " + objId) - case Some(o) => - obj = o - o.getClass - } + obj = server.jvmObjectTracker.get(JVMObjectId(objId)) --- End diff -- The `get` returns `null` but the next line will throw the exception. The old code was instead throwing a `IllegalArgumentException("Object not found " + objId)`
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