sbt编译spark程序提示value toDF is not a member of Seq() 前提 使用Scala编写的Spark程序,在sbt编译打包的时候提示value toDF is not a member of Seq(),出问题的代码如下: val urlDS = Seq(STU(age, count)).toDS() 其中STU是一个定义的case class,定义如下: case class STU(age: Int, count: Int) 查找原因 开始以为是toDS(
原文:分享非常有用的Java程序 (关键代码)(四)---动态改变数组的大小 /** * Reallocates an array with a new size, and copies the contents * * of the old array to the new array. * * @param oldArray the old array, to be reallocated. * * @param newSize the new array size. * * @return
原文:分享非常有用的Java程序 (关键代码) (二)---列出文件和目录 File dir = new File("directoryName"); String[] children = dir.list(); if (children == null) { // Either dir does not exist or is not a directory } else { for (int i=0; i < children.length; i++) { // Get f
Linux安装应用程序提示Graphical installers are not supported by the vm 参考链接:http://www-01.ibm.com/support/docview.wss?uid=swg21462180 Technote (troubleshooting) Problem(Abstract) Attempts to install IBM Security AppScan Source on Linux results in the message