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--- maven [2024/02/27 12:31] – [Maven in 5 minutes] kalaschnikow
+++ maven [2024/08/01 13:41] (current) – [Maven Getting Started Guide] kalaschnikow
@@ Line 1: / Line 1: @@
+====== Apache Maven ======
+https://maven.apache.org/
+===== Documentation =====
+==== What is Maven? ====
+https://maven.apache.org/what-is-maven.html
+  * POM = Project Object Model
+  * POM + Plugins
+  * Maven suggest guidelines for project directory layout
+  * Features of Maven
+    * simple project setup
+    * using across many projects
+      * => no ramp-up time for new developers
+    * dependency management
+    * repository of libs and metadata
+    * model-based builds
+      * JAR, WAR, ...
+    * release management and distribution publication
+      * For example:
+        * integration with SCMs (e.g. Git)
+        * releases based on a tag
+        * source ditribution
+==== Maven in 5 minutes ====
+https://maven.apache.org/guides/getting-started/maven-in-five-minutes.html
+<code>
+mvn archetype:generate -DgroupId=com.mycompany.app -DartifactId=my-app -DarchetypeArtifactId=maven-archetype-quickstart -DarchetypeVersion=1.4 -DinteractiveMode=false
+</code>
+  * ''archetype:generate''
+    * ''archetype'' - plugin
+    * ''generate'' - goal
+  * A plugin can be understood as a "collection" of goals.
+  * this ''generate'' call has created a [[https://maven.apache.org/guides/introduction/introduction-to-the-standard-directory-layout.html|standard directory layout]]. Like:
+    * my-app
+      * pom.xml
+      * /src
+        * /main
+          * /java
+            * ...
+          * ...
+        * /test
+          * /java
+            * ...
+          * ...
+  * Build the project:
+    * ''mvn package''
+      * ''package'' is a //phase// (not a goal as ''archetype:generate'')
+      * When a phase is given, Maven executes every phase in the sequence up to and including the one defined.
+  * To use proper Java version, ''maven-compiler-plugin'' should be properly configured, because by default it uses Java 8.
+  * //Default// Maven build lifecycle:
+    * ''validate'': validate the project is correct and all necessary information is available
+    * ''compile'': compile the source code of the project
+    * ''test'': test the compiled source code using a suitable unit testing framework. These tests should not require the code be packaged or deployed
+    * ''package'': take the compiled code and package it in its distributable format, such as a JAR.
+    * ''integration-test'': process and deploy the package if necessary into an environment where integration tests can be run
+    * ''verify'': run any checks to verify the package is valid and meets quality criteria
+    * ''install'': install the package into the local repository, for use as a dependency in other projects locally
+    * ''deploy'': done in an integration or release environment, copies the final package to the remote repository for sharing with other developers and projects.
+  * Other build lifecycles (not in //default//):
+    * ''clean'': cleans up artifacts created by prior builds
+    * ''site'': generates site documentation for this project
+  * Phases are actually mapped to underlying goals. The specific goals executed per phase is dependant upon the packaging type of the project. For example, package executes jar:jar if the project type is a JAR, and war:war if the project type is a WAR.
+  * An interesting thing to note is that phases and goals may be executed in sequence:
+    * ''mvn clean dependency:copy-dependencies package''
+==== Maven Getting Started Guide ====
+https://maven.apache.org/guides/getting-started/index.html
+  * Maven helps to manage:
+    * builds
+    * documentation
+    * reporting
+    * dependencies
+    * SCMs
+    * releases
+    * distribution
+  * How to make a first Maven project?
+    * archetypes = "templates" of a project
+    * ''mvn archetype:generate''
+      * Example:
+        * ''mvn -B archetype:generate -DgroupId=my.company.app DartifactId=my-app -DarchetypeVersion=1.4 -DarchetypeArtifactId=maven-archetype-quickstart''
+    * ''pom.xml''
+      * contains Project Object Model
+    * ''artifactId''
+      * used for the names of project artifacts
+        * e.g. primary artifact (typically JAR): ''myapp-1.0.jar''
+    * properties
+      * value placeholders accessible anywhere within a POM
+  * How do I compile my application sources?
+    * ''mvn compile''
+    * ''mvn test''
+      * compile + execute unit tests
+    * ''mvn test-compile''
+      * compile unit tests (without executing)
+  * How do I create a JAR and install it in my local repository?
+    * ''mvn package''
+      * packages JAR in "target" directory
+    * ''mvn install''
+      * installs the JAR in the local repo (default: ''${user.home}/.m2/repository'')
+  * How do I use plugins?
+    * ''configuration'' element applies the given parameters to every goal from the plugin
+  * How do I add resources to my JAR?
+    * use standard directory layout
+      * ''/src/main/resources''
+        * -> goes to the root of JAR
+      * ''/src/test/resources''
+        * can be addressed in Java code for example as:
+          * ''InputStream in = getClass().getResourceAsStream("/test.properties");''
+  * How do I filter resource files?
+    * To reference a property which value will be known firstly at the build time use ''${<property_name>}''
+    * The value of such property can be defined in:
+      * pom.xml
+        * ''${<property_name>}''
+          * e.g. ''${project.name}''
+      * settings.xml
+        * ''${settings.<property_name>}''
+          * e.g.''${settings.localRepository}''
+      * external properties file
+      * system property
+  * How do I use external dependencies?
+    * ''dependencies'' section in pom.xml lists all external dependencies
+    * each dependency entry defines at least:
+      * groupId
+      * artifactId
+      * version
+      * scope
+        * e.g. ''test'' or ''compile''
+    * dependencies will be fetched from local repo (default: ''${user.home}/.m2/repository'')
+      * with command: ''mvn install''
+    * if dependency is not in local repo, it will be fetched from a remote repo (by default Maven Central: https://repo.maven.apache.org/maven2)
+  * How do I deploy my JAR in my remote repository?
+    * configure repo URL in the ''pom.xml''
+    * authentication info in ''settings.xml''
+  * How do I build more than one project at once?
+    * ...
+. . .
+=== The Build Lifecycle ===
+https://maven.apache.org/guides/introduction/introduction-to-the-lifecycle.html
+Three built-in build lifecycles:
+  * default
+    * The default lifecycle handles your project deployment
+  * clean
+    * the clean lifecycle handles project cleaning
+  * site
+    * the site lifecycle handles the creation of your project's web site.
+The full [[https://maven.apache.org/guides/introduction/introduction-to-the-lifecycle.html#lifecycle-reference|Lifecycle reference]].
+Default lifecycle:
+  * ''validate'' - validate the project is correct and all necessary information is available
+  * ''compile'' - compile the source code of the project
+  * ''test'' - test the compiled source code using a suitable unit testing framework. These tests should not require the code be packaged or deployed
+  * ''package'' - take the compiled code and package it in its distributable format, such as a JAR.
+  * ''verify'' - run any checks on results of integration tests to ensure quality criteria are met
+  * ''install'' - install the package into the local repository, for use as a dependency in other projects locally
+  * ''deploy'' - done in the build environment, copies the final package to the remote repository for sharing with other developers and projects.
+===== Misc =====
+  * [[https://maven.apache.org/maven-release/maven-release-plugin/|Maven Release Plugin]]
+    * [[https://maven.apache.org/maven-release/maven-release-plugin/usage.html|Maven Release Plugin - Usage]]
+  * [[https://maven.apache.org/guides/introduction/introduction-to-the-pom.html|Introduction to the POM]]