Maven Automated Build Maven Project Documentation

Maven Snapshot (SNAPSHOT)

A large software application usually contains multiple modules, and the usual scenario is that multiple teams develop different modules of the same application. For example, imagine a team developing the frontend of the application, with the project as app-ui(app-ui.jar:1).0), while another team is developing the backend of the application, using the project data-service(data-service.jar:1)).

Now it may be the case that development of data-The service team is working on bug fixes or project improvements at a fast pace, and they almost release libraries to the remote repository every other day. Now if data-If the service team uploads a new version every other day, the following issues may arise:

data-The service team must inform the app each time they release updated code.-UI team.
app-The UI team needs to frequently update their pom.xml file to the latest version.

To solve this situation,SnapshotThe concept comes into play.

What is a snapshot?

Snapshot is a special version that specifies a copy of the current development progress. Unlike regular versions, Maven checks for new snapshots in the remote repository each time it builds. Now data-The service team will release updated code snapshots to the repository each time, such as data-[INFO] Downloading data1.0-SNAPSHOT instead of the old snapshot jar package.

Project snapshot vs version

For versions, if Maven has previously downloaded the specified version file, such as data-[INFO] Downloading data1.0, Maven will no longer download new available 1.0 file. To download the updated code, data-The version of service needs to be upgraded to1.1.

In the case of snapshot, each app-When the ui team builds their project, Maven will automatically retrieve the latest snapshot (data-[INFO] Downloading data1.0-SNAPSHOT).

app-The pom.xml file of the ui project

app-The ui project uses data-The service project's 1.0 Snapshot.

<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>app-ui</groupId>
　　　<artifactId>app-ui</artifactId>
　　　<version>1.0</version>
　　　<packaging>jar</packaging>
　　　<name>health</name>
　　　<url>http://maven.apache.org</url>
　　　<properties>
　　　　　　UTF-8properties>/<project.build.sourceEncoding>UTF
　　　properties>/project.build.sourceEncoding>
　　　<dependencies>
　　　　　　<dependency>
　　　　　　<groupId>data-service</groupId>
　　　　　　　　　<artifactId>data-service</artifactId>
　　　　　　　　　<version>1.0-SNAPSHOT</version>
　　　　　　　　　<scope>test</scope>
　　　　　　properties>/dependency>
　　　properties>/dependencies>
properties>/<

data-The pom.xml file of the service project

data-The service project is released for each small change 1.0 Snapshot.

<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>data-service</groupId>
　　　<artifactId>data-service</artifactId>
　　　<version>1.0-SNAPSHOT</version>
　　　<packaging>jar</packaging>
　　　<name>health</name>
　　　<url>http://maven.apache.org</url>
　　　<properties>
　　　　　　UTF-8properties>/<project.build.sourceEncoding>UTF
　　　properties>/project.build.sourceEncoding>
properties>/<

project> -Although, in the case of snapshots, Maven will automatically get the latest snapshot in daily work, you can also use it in any maven command

U parameter forces Maven to build the latest snapshot now.　-ui>mvn clean package

mvn clean package-Let's open the command console, go to C:\ > MVN > app

ui directory, and then execute the following mvn command.-C:\MVN\app　-ui>mvn clean package

U-Maven will download data