Programmer Group

1. Introduction to Kafka   1.1. Main functions According to the introduction of the official website, ApacheKafka ® is a distributed streaming media platform, which has three main functions: 1: It lets you publish and subscribe to streams of records 2: it lets you store streams of records in a fault tolerant way 3: It lets you process ...

background In our actual project development process, we often need to copy the attributes of two different object instances, so that we can carry out subsequent operations based on the attribute information of the source object without changing the attribute information of the source object, such as DTO data transfer object and data object DO. ...

A protocol version error occurred while Archiva was running after successful installation: Caused by: javax.net.ssl.SSLException: Received fatal alert: protocol_version         at sun.security.ssl.Alerts.getSSLException(Alerts.java:208) ~[?:1.7.0_80]         at sun.security.ssl.Alerts.getSSLException(Alerts.java:154) ~[?:1.7.0_80]         at s ...

Spring cloud uses feign consumer service and uses hystrix to fuse Service consumption (create a feign project and use hystrix) Project screenshots configuration file Code Monitor configuration file Code Operation and verification Startup service Monitoring service Connection address Service consumption (create a fe ...

Summary This blog builds a cluster environment based on zookeeper-3.4.9. 1. Download zookeeper Edition: http://zookeeper.apache.org/releases.html#download Download version: zookeeper-3.4.9.tar.gz 2. Host 192.168.8.21, 192.168.8.22, 192.168.8.23, 192.168.8.24 and 192.168.8.25. 3. Decompression tar -zxvf zookeeper-3.4.9.t ...

The cause of stack overflow Before solving the stack overflow problem, we first need to know the causes of stack overflow, which are mainly as follows: Whether there is recursive call or not, cyclic dependent call Is there a large number of cycles or dead cycles Too many global variables Local variables are too large, such as array, List, Map ...

1. Dubbo springboot entry level demo 1.1. Preface The last operation and maintenance friend mentioned to me that their company wanted to do a dubbo gray publishing function, and this function fell to him. In my impression, dubbo should be able to realize specific users' routing to specific servers through extended code, so as to realize the gr ...

This article collates the jar packages and API records that I often use in Java development. <!-- https://mvnrepository.com/artifact/org.apache.commons/commons-lang3 --> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> <ve ...

Tomcat is implemented as a servlet container, which is a lightweight application server developed based on Java language. As an application server, Tomcat has the advantages of full open source, light weight, stable performance, low deployment cost, etc., so it has become the first choice for java development and application deployment at pres ...

https://start.spring.io/ generate SpringBoot project   The pom file should be me: <?xml version="1.0" encoding="UTF-8"?> <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 ...