http://docs.spring.io/spring/docs/current/spring-framework-reference/html/websocket.html https://spring.io/guides/gs/messaging-stomp-websocket/ https://github.com/rstoyanchev/spring-websocket-portfolio 项目中用到了消息的实时推送,查资料后用到了Spring websocket,找了很多资料,还是感…

一.需求:计算网页访问量前三名 import org.apache.spark.rdd.RDD import org.apache.spark.{SparkConf, SparkContext} /** * 需求:计算网页访问量前三名 * 用户:喜欢视频 直播 * 帮助企业做经营和决策 * * 看数据 */ object UrlCount { def main(args: Array[String]): Unit = { //1.加载数据 val conf:SparkConf = new Spa…

在我刚刚接触现在这个产品的时候,我就在我们的代码中接触到了对Double Brace Initialization的使用.那段代码用来初始化一个集合: final Set<String> exclusions = new HashSet<String>() {{ add(‘Alice’); add(‘Bob’); add(‘Marine’); }}; 相信第一次看到这种使用方式的读者和我当时的感觉一样:这是在做什么?当然,通过在函数add()的调用处加上断点,您就会了解到这实际上是…

本地原来已经安装了JAVA JDK1.7并配置好了环境变量; 然后又安装了JDK8,想2个版本并存. 然后发现eclipse 打不开,闪退.然后查看环境: 发现 C:\Users\Administrator>java -versionError occurred during initialization of VMjava/lang/NoClassDefFoundError: java/lang/Object 于是执行: C:\Users\Administrator>java -fullve…

body { font-family: "Microsoft YaHei UI","Microsoft YaHei",SimSun,"Segoe UI",Tahoma,Helvetica,Sans-Serif,"Microsoft YaHei", Georgia,Helvetica,Arial,sans-serif,宋体, PMingLiU,serif; font-size: 10.5pt; line-height: 1.5;…

1:出现此种错误应该是jar版本包冲突了,启动hive的时候,由于hive依赖hadoop,启动hive,会将hadoop的配置以及jar包等等导入到hive中,导致jar包版本冲突,下面贴一下错误,然后贴一下解决方法: [root@master bin]# ./hive Logging initialized -bin/lib/hive-common-.jar!/hive-log4j.properties [ERROR] Terminal initialization failed; fall…

参考链接 : https://blog.csdn.net/angus_Lucky/article/details/82811946?utm_source=blogxgwz7 org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'connectionFactory' defined in class path resource [spring/applicationContex…

java.lang.NoClassDefFoundError: com.sap.conn.jco.JCo (initialization failure) at java.lang.J9VMInternals.initialize(J9VMInternals.java:134) at com.sap.conn.jco.JCoDestinationManager.getDestination(JCoDestinationManager.java:61) 原因: 1.sapjco3.jar和sapj…

Q: <hibernate.version>5.2.10.Final</hibernate.version><dependency> <groupId>org.springframework.data</groupId> <artifactId>spring-data-jpa</artifactId> <version>2.0.2.RELEASE</version> </dependency&…

严重: Dispatcher initialization failed java.lang.RuntimeException: java.lang.reflect.InvocationTargetException处理方法: 1.核对lib包    commons-fileupload-1.2.1.jar, commons-io-1.3.2.jar commons-logging-1.0.4.jar freemarker-2.3.16.jar ognl-3.0.jar struts2-core…