POM

POM(Project Object Model)

1.Minimal POM

<project> <modelVersion>4.0.0</modelVersion> <groupId>com.mycompany.app</groupId> <artifactId>my-app</artifactId> <version>1</version> </project>

2.Default

如果configuration细节未指定，mvn会使用默认的配置，比如packaging type默认为jar。如果repositories未指定默认下载dependencies from http://repo.maven.apache.org/maven2

3.Project Inheritance

    使用<parent></parent>来继承，如果不写groupId / version of modules，自动继承父类的。 . |-- my-module | `-- pom.xml `-- pom.xml <project> <parent> <groupId>com.mycompany.app</groupId> <artifactId>my-app</artifactId> <version>1</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>my-module</artifactId> </project>     如果父类的pom.xml不在该module的上级目录或者不在local repository,则要使用<relativePath></relativePath>指定目录 . |-- my-module | `-- pom.xml `-- parent `-- pom.xml <project> <parent> <groupId>com.mycompany.app</groupId> <artifactId>my-app</artifactId> <version>1</version> <relativePath>../parent/pom.xml</relativePath> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>my-module</artifactId> </project>

4. Project Aggregation

不是在module中指定父POM，而是在父POM中指定module com.mycompany.app:my-app:1's POM <project> <modelVersion>4.0.0</modelVersion> <groupId>com.mycompany.app</groupId> <artifactId>my-app</artifactId> <version>1</version> </project> com.mycompany.app:my-module:1's POM <project> <modelVersion>4.0.0</modelVersion> <groupId>com.mycompany.app</groupId> <artifactId>my-module</artifactId> <version>1</version> </project> directory structure . |-- my-module | `-- pom.xml `-- pom.xml The Solution <project> <modelVersion>4.0.0</modelVersion> <groupId>com.mycompany.app</groupId> <artifactId>my-app</artifactId> <version>1</version> <packaging>pom</packaging> <modules> <module>my-module</module> </modules> </project> 如果不是正常目录，要指定目录 . |-- my-module | `-- pom.xml `-- parent `-- pom.xml <project> <modelVersion>4.0.0</modelVersion> <groupId>com.mycompany.app</groupId> <artifactId>my-app</artifactId> <version>1</version> <packaging>pom</packaging> <modules> <module>../my-module</module> </modules> </project>

5.Project Interpolation and Variables

<version>${project.version}</version> <project> ... <properties> <maven.build.timestamp.format>yyyy-MM-dd'T'HH:mm:ss'Z'</maven.build.timestamp.format> </properties> ... </project> <project> <parent> <groupId>com.mycompany.app</groupId> <artifactId>my-app</artifactId> <version>1</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>my-module</artifactId> </project> <project> <parent> <groupId>com.mycompany.app</groupId> <artifactId>my-app</artifactId> <version>1</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>my-module</artifactId> </project>