qq_41807801的博客

具体的错误：Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root causejava.la...

因为是初学，想写个最简单的练手，结果报错：class test { def main(args: Array[String]): Unit = { println("Hello, Scala!") }}最初以为是版本问题折腾半天，结果发现是低级错误。在新建一个scala时要选择objectobject test { def main(args: Array[St...

本人在学习OpenCV时按照书上的代码敲：cvtColor(srcImage,grayImage,COLOR_BGR2GRAY );这里遇到报错：error: ‘CV_BGR2GRAY’ was not declared in this scope cvtColor(srcImage,grayImage,CV_BGR2GRAY );一直不接，查了半天才发现是由于版本更新，CV...