Creation of multi-module inheritance and aggregation for MAVEN engineering under Eclipse

Multi-module inheritance and aggregation is essential when using MAVEN to manage projects, and this article briefly explains the creation of multi-module projects under the Eclipse IDE.

1.Maven Multi-Module aggregation

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A MAVEN project creates multiple modules and then organizes the modules that are actually applied to them with a dedicated management module.

2.Maven Multi-Module inheritance

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The submodule receives the Pom.xml configuration information in the parent module by inheriting the parent module.

3.Maven Multi-Module inheritance + aggregation

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is to combine 1 and 2, you can use the parent module as an aggregation module and a parent module so that the parent module can aggregate (organize) its submodules, and the submodule can inherit the parent module.

4. The relationship between aggregation and inheritance

difference :

• For an aggregation module, it knows which modules are aggregated, but the aggregation modules are independent of each other.

• For the parent pom of an inheritance relationship, it does not know which submodules inherit it, but those submodules must know their parent pom.

Common denominator:

• The packaging of the parent pom in the aggregation pom and the inheritance relationship are all pom.

• The parent module in the aggregation module and the inheritance relationship has no actual content except the POM.

5. Use Eclipse to build a project that integrates aggregation and inheritance

5.1 Create a MAVEN project, which acts as an aggregation module

<groupid>secondriver</groupid><artifactid>code-parent</artifactid><version>0.0.1 -snapshot</version><packaging>pom</packaging><name>code-parent</name><url> Http://maven.apache.org</url>

5.2 Create the Javase maven module (Code-utils, pictured in Code-utilss) and select the Code-parent project above as the parent project.

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5.3 Ibid., create javaweb maven module (code-web), and select the above Code-parent project as the character project.

5.4 The directory structure in eclipse

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On the way there are three projects, accurate said Code-parent is Maven project, Code-utils,code-web is the Code-parent project under the two modules; code-parent it was aggregated, code-utils, Code-web inherited the Code-parent.

Directory structure of the local file system:

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The Pom file under Code-parent inherits the Pom.xml for the Pom.xml under the parent pom.xml,code-utils and Code-web.

5.5 Code-parent's Pom.xml

<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>secondriver</groupId> <artifactId>code-parent</artifactId><version>0.0.1-SNAPSHOT</version><packaging> pom</packaging><name>code-parent</name><url>http://maven.apache.org</url>< modules><module>code-utils</module><module>code-web</module></modules>< properties><project.build.sourceencoding>utf-8</project.build.sourceencoding>< project.reporting.outputencoding>utf-8</project.reporting.outputencoding><junit.version>4.10 </junit.version></properties><description> This is the parent module, which is integrated with the Submodule, which inherits the module. The main role is the unified management of public configuration </description><dependencies><dependency> <groupid>junit</groupid><artifactid>junit</artifactid><version>${junit.version} </version><scope>test</scope></dependency></dependencies>< Dependencymanagement><dependencies></dependencies></dependencymanagement></project>

The value of packaging in the configuration is pom, which means that code-parent is an aggregation module or a parent module, where it belongs to both. The modules is configured with two modules, namely Code-utils and Code-web.

The pom.xml of 5.6code-utils and Code-web

• Code-parent/code-utils/pom.xml

<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><parent><groupid>secondriver</groupid>< artifactid>code-parent</artifactid><version>0.0.1-snapshot</version></parent>< Artifactid>code-utils</artifactid><name>code-utils</name></project>

The default packaging value in the configuration is jar.

• Code-parent/code-web/pom.xml

<?xml version= "1.0"? ><projectxsi:schemalocation= "http://maven.apache.org/POM/4.0.0/http Maven.apache.org/xsd/maven-4.0.0.xsd "xmlns=" http://maven.apache.org/POM/4.0.0 "xmlns:xsi=" http://www.w3.org/ 2001/xmlschema-instance "><modelVersion>4.0.0</modelVersion><parent><groupId> secondriver</groupid><artifactid>code-parent</artifactid><version>0.0.1-snapshot</ Version></parent><artifactid>code-web</artifactid><packaging>war</packaging> <name>code-web Maven webapp</name><url>http://maven.apache.org</url><build>< Finalname>code-web</finalname></build></project>

The MAVEN project to create a multi-module through eclipse is complete. As for how Pom.xml is configured, it is another matter, for more information on MAVEN's pom.xml configuration see: Http://maven.apache.org/pom.html#Resources

This article is from the "Red Horse Red" blog, please be sure to keep this source http://aiilive.blog.51cto.com/1925756/1596192

Creation of multi-module inheritance and aggregation for MAVEN engineering under Eclipse