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From http://commons.apache.org/proper/commons-lang/javadocs/api-release/org/apache/commons/lang3/ Official documents to organize and remember for yourself 3. BooleanUtils Boolean Tool Class and(boolean...array) logic and BooleanUtils.and(true, true) = true BooleanUtils.and(false, false) = false ...

1. Modify in maven projectPom.xmlIntroduce dependencies on spring.<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com ...

Next: RocketMQ entry to earth (1) novice can also understand the principle and actual combat! 1, Origin of transaction message 1. Case study Quoting official shopping cases: At the same time, you need to add 100 points to the downstream account to ensure that 100 yuan will be deducted from the system. Account system and points system are two in ...

Hadoop stepping on the pit (3) Eclipse configures hadoop development environment Environmental Science windows 10 java 1.8 Namenode (Hadoop 1-ali) alicloud (CentOS 7.3) 120.26.173.104 hadoop version 2.8.5 Eclipse installation Enterprise version needs to be installed. For network reasons, offline installation package is recommended https://www.e ...

Hadoop stepping on the pit (4) Hbase client programming (Eclipse) Environmental Science For the installation and configuration of Hbase and the configuration of Eclipse, please refer to the previous two articles The version of hbase used in this series is 1.4.13 The selected hadoop version of this series is 2.8.5 Please pay attention to the per ...

catalog How Dubbo's XML is used and how it integrates with Spring ServiceClassPostProcessor Implemented BeanDefinitionRegistryPostProcessor class How the bean instance of ServiceClassPostProcessor is injected into the container in advance. The definition of DubboNamespaceHandler, the parsing class ...

Learning any technology is a two-step process: Setting up the environment helloworld I'm no exception. I'll do it directly. 1, RocketMQ installation 1. Documents Official website http://rocketmq.apache.org GitHub https://github.com/apache/rocketmq 2. Download wget https://mirror.bit.edu.cn/apache/rocketmq/4.7.0/rocketmq-all-4.7.0-bin-rele ...

1. Introduction In the previous receiving ActiveMQ and code cases, you have configured: broker-url: tcp://192.168.106.131:61616 See the default protocol of ActiveMQ for TCP. However, ActiveMQ processing supports TCP thank you. It also supports client broker communication protocols: TCP, NIO, UDP, ...

window operation on data In the window operation of flow data, when event time passes the window time, it will close the window. Then in the actual production environment, due to various reasons such as the network, late data may appear, resulting in data disorder. As shown in the figure below, the ...

Article catalog 1, Single machine environment construction 1.1 download 1.2 decompression 1.3 configure environment variables 1.4 modify configuration 1.5 start up 1.6 verification 2, Cluster environment construction 2.1 modify configuration 2.2 identification node 2.3 start cluster 2.4 cluster ve ...