21:09:22.221 [MessageBroker-3] INFO c.t.s.s.impl.StockNewsServiceImpl - [2017-12-16 21:09:22] execute fetch stock news, result = 0 21:09:32.158 [MessageBroker-2] INFO c.t.s.s.impl.StockNewsServiceImpl - [2017-12-16 21:09:32] execute fetch stock news,…

java.lang.ClassCastException: org.apache.cxf.transport.servlet.CXFServlet cannot be cast to javax.servlet.Servlet maven下web项目依赖servlet-api.jar <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId>…

spark 2.1.1 spark在写数据到hive外部表(底层数据在hbase中)时会报错 Caused by: java.lang.ClassCastException: org.apache.hadoop.hive.hbase.HiveHBaseTableOutputFormat cannot be cast to org.apache.hadoop.hive.ql.io.HiveOutputFormat at org.apache.spark.sql.hive.SparkHiveWrit…

springboot项目添加websocket依赖后运行测试类报如下错误: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'serverEndpointExporter' defined in org.lwt.WebsocketServerTestApplication: Invocation of init method failed; nested exceptio…

How to Install Apache Tomcat 8.5 on CentOS 7.3 From: https://www.howtoforge.com/tutorial/how-to-install-tomcat-on-centos/ This tutorial exists for these OS versions CentOS 7.3 CentOS 7 On this page Step 1 - Install Java (JRE and JDK) Step 2 - Configu…

问题描述:spring boot接入websocket时,启动报错:javax.websocket.server.ServerContainer not available <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-websocket</artifactId></dependency> 原因:因为sp…

在使用 import org.apache.spark.ml.feature.VectorAssembler 转换特征后,想要放入 import org.apache.spark.mllib.classification.SVMWithSGD 去训练的时候出现错误: Caused by: java.lang.ClassCastException: org.apache.spark.ml.linalg.DenseVector cannot be cast to org.apache.spark.m…

Caused by: java.lang.ClassCastException: io.undertow.websockets.jsr.ServerWebSocketContainer cannot be cast to org.apache.tomcat.websocket.server.WsServerContainer at org.springframework.web.socket.server.standard.TomcatRequestUpgradeStrategy.getCont…

一.应用场景 在生产环境中,应用服务器(此文以tomcat为例)不免面临高访问量的压力,相比而言web服务器(此文以apache为例)能够承担更大的并发量.Apache本身带有一些模块,可以完成对应用服务器访问流量分流分压的功能.这里就以apache+tomcat配置负载均衡的方式,实现http与websocket接口分压的效果. 二.系统环境 服务器:阿里云ECS服务器: 操作系统:ubuntu 14: 应用服务器:tomcat 8.5+; Web服务器:apache 2.4+; 三.Tomc…

要明白他们之间的区别,我们首先需要明白HTTP协议.HTML页面.JSP.Servlet之间的区别和联系. HTTP协议是在TCP/IP协议之上的应用层协议,用以在客户端和服务器之间传递信息.一般传递的是HTML文本信息. 服务器端可以存储一些静态HTML文件,当前端使用HTTP协议请求对应文件时,服务器就把这个文件发送给前端. Apache HTTP Server的作用就是解析客户端发送过来的HTTP协议,并把指定的静态HTML文本返回前端. Servlet是一种部署在服务器端的程序(按照Se…