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我有多个 ScalaTest 类，用于BeforeAndAfterAll构造 aSparkContext并在之后停止它，如下所示：

class MyTest extends FlatSpec with Matchers with BeforeAndAfterAll {

  private var sc: SparkContext = null

  override protected def beforeAll(): Unit = {
    sc = ... // Create SparkContext
  }

  override protected def afterAll(): Unit = {
    sc.stop()
  }

  // my tests follow
}

这些测试在从 IntelliJ IDEA 启动时运行良好，但在运行时sbt test，我得到WARN SparkContext: Another SparkContext is being constructed (or threw an exception in its constructor). This may indicate an error, since only one …