Programmer Think

spring boot packs all dependent jars into one jar by default when it packs and runs jars. This is inconvenient because the packaged jar packages are relatively large and need to be uploaded to the server for a long time. Here, we can use the assembly plug-in to package dependent jars into external independent folders. In the future, we only nee ...

springboot is very simple to start a transaction, only one annotation is needed @Transactional Just fine. Because in springboot, events have been enabled for jpa, jdbc and mybatis by default. When they are introduced, things will be enabled by default. Of course, if you need to use other orm, such as beatlsql, you need to configure the relevant ...

Emum (enumeration) Enumeration is a basic data type in C. It can make data more concise and readable. Enumeration grammar is defined in the following format: enum enumeration name {enumeration element 1, enumeration element 2,...}; For example, if there are 7 days in a week, instead of enumeration, we need to use #define to define an alias for ...

TIPS This article is based on Spring Cloud Hoxton, supporting all versions of Spring Cloud in theory. This article explores how to customize the InstanceId registered with Consul for microservices. Consul uses InstanceId as its unique identity, while Spring Cloud Consul defaults to InstanceId of ${spring.application.name}-${server.port}. The ...

Docker deploys spring cloud project Eureka server 1 create Eureka server project Create the parent project cloud demo, whose pom.xml is as follows: <?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:// ...

Format of switch statement: Switch (expression) case value 1: execute statement; break; case value 2: execute statement; break;            ... default: execute statement; break;   switch statement features: (1) the value of expression can be byte, short, int, char; After jdk5, enumeration types can be used; After jdk7 ...

Use Feign to call Hystrix to learn the circuit breaker, and always report the error There is already 'computed client Hystrix' bean method mapped Related classes are as follows: Interface class for calling remote service @FeignClient(value="COMPUTE-SERVICE", fallback=ComputeClientHystrix.class) @RequestMapping("computer") public interface Co ...

This issue introduces how Canvas draws pictures, including how to draw high-definition pictures, use network pictures / local pictures, date conversion (lunar and solar calendar / week conversion), picture adaptation mobile phone model, etc. Layout introduction There are four parts here. The picture above shows the QR Co ...

191214 spring boot series tutorials automatic configuration selection takes effect After writing a series of Spring blogs for so long, I found a problem. All previous articles focused on making one thing work. Is there anything that goes against it? We know that @ ConditionOnXxx can be used to determine whether a configuration class can be ...

**Problem Description: when using the default scheduled tasks of springboot, if there are multiple tasks, the framework will only start one thread for execution by default, which will cause some tasks cannot start execution at the specified time** **In addition, a separate record will be written about the synchronization lock of timed tasks un ...