{"id":12608,"date":"2021-02-19T12:05:34","date_gmt":"2021-02-19T17:05:34","guid":{"rendered":"http:\/\/jianmingli.com\/wp\/?p=12608"},"modified":"2021-02-19T12:05:34","modified_gmt":"2021-02-19T17:05:34","slug":"maven-pom-hierarchy","status":"publish","type":"post","link":"https:\/\/jianmingli.com\/wp\/?p=12608","title":{"rendered":"Maven POM Hierarchy"},"content":{"rendered":"
\n

Contents<\/h2>\n
    \n\t
  1. \n\t\tOverview<\/a>\n\t<\/li>\n\t
  2. \n\t\tProject Inheritance<\/a>\n\t\t
      \n\t\t\t
    1. \n\t\t\t\tSuper POM<\/a>\n\t\t\t<\/li>\n\t\t\t
    2. \n\t\t\t\tMinimal POM<\/a>\n\t\t\t<\/li>\n\t\t\t
    3. \n\t\t\t\tParent POM<\/a>\n\t\t\t<\/li>\n\t\t<\/ol>\n\t
    4. \n\t\tProject Aggregation<\/a>\n\t\t
        \n\t\t\t
      1. \n\t\t\t\tParent POM with Aggregation<\/a>\n\t\t\t<\/li>\n\t\t\t
      2. \n\t\t\t\tProject Model Variables<\/a>\n\t\t\t<\/li>\n\t\t\t
      3. \n\t\t\t\tProject Properties<\/a>\n\t\t\t<\/li>\n\t\t<\/ol>\n\t
      4. \n\t\tReferences<\/a>\n\t<\/li>\n<\/ol>\n<\/ol>\n<\/div>\n
         <\/div>\n

        Overview<\/h2><\/span>\n

        * POM: project object model
        \n* POM is an xml file
        \n* Used to build a project<\/p>\n

        Project Inheritance<\/h2><\/span>\n

        * Following elements in POM are merged:
        \n– dependencies
        \n– developers and contributors
        \n– plugin lists (including reports)
        \n– plugin executions with matching ids
        \n– plugin configuration
        \n– resources<\/p>\n

        Super POM<\/h3><\/span>\n

        * All POMs extends the super POM
        \n* Default package: jar
        \n* Default repository is central repository: https:\/\/repo1.maven.org\/maven2\/<\/p>\n

        Minimal POM<\/h3><\/span>\n

        * Mandatory elements:<\/p>\n

        \r\n\r\n  4.0.0<\/modelVersion>\r\n \r\n  com.mycompany.app<\/groupId>\r\n  my-app<\/artifactId>\r\n  1<\/version>\r\n<\/project>\r\n<\/pre>\n
        * Other elements inherit from super POM<\/p>\n
        Parent POM<\/h3><\/span>\n
        * Specify parent pom:<\/p>\n
        \r\n\r\n  4.0.0<\/modelVersion>\r\n  \r\n  com.mycompany.app<\/groupId>\r\n  1<\/version>\r\n  \r\n \r\n  \r\n    com.mycompany.app<\/groupId>\r\n    my-app<\/artifactId>\r\n    1<\/version>\r\n\t\r\n  <\/parent>\r\n  \r\n  my-module<\/artifactId>\r\n<\/project>\r\n<\/pre>\n
        Project Aggregation<\/h2><\/span>\n
        * Set packaging to: pom
        \n* Specify child POMs as modules:<\/p>\n
        \r\n\r\n  4.0.0<\/modelVersion>\r\n \r\n  com.mycompany.app<\/groupId>\r\n  my-app<\/artifactId>\r\n  1<\/version>\r\n  pom<\/packaging>\r\n \r\n  \r\n    my-module<\/module>\r\n  <\/modules>\r\n<\/project>\r\n<\/pre>\n
        Parent POM with Aggregation<\/h3><\/span>\n
        * You can specify parent pom to also include modules:<\/p>\n
        \r\n\r\n  4.0.0<\/modelVersion>\r\n \r\n  com.mycompany.app<\/groupId>\r\n  my-app<\/artifactId>\r\n  1<\/version>\r\n  pom<\/packaging>\r\n \r\n  \r\n    my-module<\/module>\r\n  <\/modules>\r\n<\/project>\r\n<\/pre>\n
        * Child POM:<\/p>\n
        \r\n\r\n  4.0.0<\/modelVersion>\r\n \r\n  \r\n    com.mycompany.app<\/groupId>\r\n    my-app<\/artifactId>\r\n    1<\/version>\r\n    pom.xml<\/relativePath>\r\n  <\/parent>\r\n \r\n  my-module<\/artifactId>\r\n<\/project>\r\n<\/pre>\n
        Project Model Variables<\/h3><\/span>\n
        * Variable values defined in child POM take precedence over parent values
        \n* Project model variables
        \n– any single value element can be referenced as a variable, e.g.:<\/p>\n
        \r\n${project.groupId}\r\n${project.version}\r\n${project.build.sourceDirectory}\r\n${project.basedir}\r\n${project.baseUri}\r\n${maven.build.timestamp}\r\n<\/pre>\n
        Project Properties<\/h3><\/span>\n
        * Any properties defined in project can be referenced as a variable:<\/p>\n
        \r\n  \r\n    yyyy-MM-dd'T'HH:mm:ss'Z'<\/maven.build.timestamp.format>\r\n  <\/properties>\r\n<\/pre>\n
        References<\/h2><\/span>\n
        * Introduction to the POM<\/a>
        \n*         POM Reference<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
        Overview * POM: project object model * POM is an xml file * Used to build a project Project Inheritance * Following elements in POM are merged: – dependencies – developers and contributors – plugin lists (including reports) – plugin … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[135],"tags":[605],"class_list":["post-12608","post","type-post","status-publish","format-standard","hentry","category-maven-lang","tag-maven"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p8cRUO-3hm","_links":{"self":[{"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=\/wp\/v2\/posts\/12608","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=12608"}],"version-history":[{"count":1,"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=\/wp\/v2\/posts\/12608\/revisions"}],"predecessor-version":[{"id":12609,"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=\/wp\/v2\/posts\/12608\/revisions\/12609"}],"wp:attachment":[{"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=12608"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=12608"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=12608"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}