用janusgraph和gremlin scala为spark构建sbt

Question

我试图使用gremlin设置一个IntelliJ构建，用于使用janusgraph，但我遇到了错误。

我的build.sbt文件是：

version := "1.0"

scalaVersion := "2.11.11"

libraryDependencies += "com.michaelpollmeier" % "gremlin-scala" % "2.3.0"
libraryDependencies += "org.apache.spark" %% "spark-core" % "2.2.1"
// https://mvnrepository.com/artifact/org.apache.spark/spark-sql
libraryDependencies += "org.apache.spark" %% "spark-sql" % "2.2.1"
// https://mvnrepository.com/artifact/org.apache.spark/spark-mllib
libraryDependencies += "org.apache.spark" %% "spark-mllib" % "2.2.1"
// https://mvnrepository.com/artifact/org.apache.spark/spark-hive
libraryDependencies += "org.apache.spark" %% "spark-hive" % "2.2.1"
// https://mvnrepository.com/artifact/org.janusgraph/janusgraph-core
libraryDependencies += "org.janusgraph" % "janusgraph-core" % "0.2.0"

libraryDependencies ++= Seq(
  "ch.qos.logback" % "logback-classic" % "1.2.3" % Test,
  "org.scalatest" %% "scalatest" % "3.0.3" % Test
)

resolvers ++= Seq(
  Resolver.mavenLocal,
  "Sonatype OSS" at "https://oss.sonatype.org/content/repositories/public"
) 

但是，当我试图编译使用gremlin库或io.Source库的代码时，会出现错误。有人能分享他们的构建文件或者告诉我应该修改什么来修复它吗？提前谢谢。

所以，我试图编译这段代码：

import gremlin.scala._
import org.apache.commons.configuration.BaseConfiguration
import org.janusgraph.core.JanusGraphFactory


class Test1() {
  val conf = new BaseConfiguration()
  conf.setProperty("storage.backend", "inmemory")
  val gr = JanusGraphFactory.open(conf)
  val graph = gr.asScala()
  graph.close

}

object Test{
  def main(args: Array[String]) {
    val t = new Test1()
    println("in Main")
  }
}

我所犯的错误是：

错误：(1，8)找不到:对象gremlin导入gremlin.scala._

错误：(10，18)值asScala不是org.janusgraph.core.JanusGraph val图= gr.asScala()的成员

Answer 1

如果您转到Gremlin-Scala GitHub页面，您将看到当前版本是"3.3.1.1“，并且

通常，您只需要在"com.michaelpollmeier" %% "gremlin-scala" % "SOME_VERSION"上添加一个依赖项，并为您选择的图形db添加一个依赖项到您的build.sbt中(该自述假设为修补程序)。最新版本显示在此自述文件的顶部，并显示在maven徽章中。

当库的主要版本不同时，APi发生了变化也就不足为奇了。如果我将您的第一个依赖项更改为

//libraryDependencies += "com.michaelpollmeier" % "gremlin-scala" % "2.3.0" //old!
libraryDependencies += "com.michaelpollmeier" %% "gremlin-scala" % "3.3.1.1"

然后，您的示例代码将为我编译。