Tomcat启动失败,失败全部信息: 五月 , :: 下午 org.apache.tomcat.util.digester.SetPropertiesRule begin 警告: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:MyEL' did not find a matching property. 五月 , ::
当 arr 是一个array时,写Java开始的corner case常常会写类似下面的语句: if(arr == null || arr.length == 0){ return 0; } 其实这是两个条件, arr==null 和 arr.length==0 是不同的: arr.length == 0说明 arr is an empty array, which means an empty array is assigned to arr; arr.length would yields
进行如下设置,解决报错信息. val conf = new SparkConf().setAppName("helloSpark").setMaster("spark://master:7077").set("spark.executor.memory", "2g")val sc = new SparkContext(conf)sc.addJar("/home/spark/IdeaProjects/FirstApp/
遇到这个错误是在Apache Tomcat上部署应用程序的时候遇到的,具体的错误描述是: java.lang.UnsupportedClassVersionError: HelloWorld has been compiled by a more recent version of the Java Runtime (class file version 53.0), this version of the Java Runtime only recognizes class file vers