我把学习Scala作为个人兴趣,但我对以下内容的返回值感到困惑: var t : Long = 1 def product(s:String):Long = { if(s.length > 1) t *= product(s.tail) else t *= s.toLong } 这是一个递归函数,但编译器提示我两个错误: <console>:13: error: type mismatch; found : Unit required: Long...
误差(java.lang.NoClassDefFoundError:scala/Product$class)通常表示它试图使用为不兼容的Scala版本构建的...
elasticsearch-hadoop:6.1.0依赖于用Scala 2.11编译的spark,所以应该选择兼容的spark版本。
When trying out the first example in the tutorials section (http://sedona.apache.org/tutorial/sql/), I am suffering a NoClassDefException as a cause of a ClassNotFoundException: SparkSession sparkSession = SparkSession.builder() .appName("de.oth.GeosparkDemoApplication") ...
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Caused by: java.lang.ClassNotFoundException: scala.Product$class 后来修改build.sbt成下面的格式 name :="sbttest"version :="0.1"scalaVersion :="2.11.12"libraryDependencies+="org.apache.spark"%"spark-core_2.11"%"2.3.1"libraryDependencies+="org.apache.spark"%"spark-sql_2.11"%"2.3.1" ...
382 添加了以下JAR:opensearch-hadoop-1.0.1.jar aws-java-sdk-1.12.531.jar 并使用以下配置:
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今天使用Spark进行RDD操作,当我开始运行程序时,出现Caused by: java.lang.ClassNotFoundException: scala.Product$class, 我最后检查了下,发现我项目里面的spark-core版本和整个项目的scala版本不一致所导致的。 我用Maven构建的项目,pom.xml文件部分结构如下: 由于我之前出错的原因是:spark-core依赖我... ...
productPrefix _2 _4 _6 canEqual equals productArity productIterator toString scala> t1._1 res30: Int = 1 scala> t1._3 res31: String = Hello 如何遍历Tuple中的元素 注意:Tuple没有提供foreach函数,我们使用productIterator 遍历Tuple分成两步: ...