Sprig Maven

• Maven is a project management tool


• ANT is also a build tool which is similar to Maven and it is a default build tool in Intellij IDEA,Netbeans,Eclips


• Replace the build tool to maven.


• Maven has a common folder structure.Hence any developer can easily identify the project.


• Maven can create documentation by checking the source code of the project.Hence source code should be correctly formatted.


• Source code read by doc comments


• Maven is a collection of dependency management tool and document development tool


• All the dependencies are download into the home directory as common repository not for each project.





• Plugins are created by set of goals.


• Maven is created by set of pulgins.


• Create a Project :

  mvn archetype:generate -DarchetypeArtifactId=maven-archetype-quickstart -DgroupId=com.mycompany.app -DartifactId=my-app



• Execute a goal : mvn :
  • EX : mvn compiler : compile


• Maven life Cycle
  1. Clean(clear all created artifacts and rebuild the project)
  2. Default(create project)
  3. Site(Use to create websites)


• can compile one or more life cycles together.("mvn clean defualt site")


• Life cycles have one or more phases.


• Clean
  1. pre-clean
  2. post-clean
  3. clean


• Default
  1. validate (check folder structure)
  2. compile (compile the code)
  3. test (compile test cases)
  4. package (build artifacts)
  5. verify (check integration tests)
  6. install (install project as a dependency in a local repository)
  7. deploy (send the project to the remote repository from local rep)


• Site
  1. pre-site
  2. post-site
  3. site
  4. site deploy


• Phase is created by set of goals from different set of plugins.


• Archetype is a project template in maven.
  Examples for archetypes :
  1. maven-archetype-quickstart
  2. maven-archetype-webapp


• Project structure



• POM (Project Object Model)
  • ‘pom.xml’ contains the Project Object Model for the project
  • POM contains every important piece of information about the project.
    com.mycompany.app my-app jar 1.0-SNAPSHOT Maven Quick Start Archetype
  • Generate IDE specific project descriptor
    mvn idea:idea mvn eclipse:eclipse
  
  

Dependency Management

• type
  Packaging type of the project (jar, war, ear)
• version
  Version of the project. “SNAPSHOT”: A beta version in changing phase Downloaded when a maven phase is executed in a timely manner
• optional
  Marks as optional when the project itself is a dependency./li>
• scope
  Classpath of the task (compiling, runtime or test execution) Different scopes are as following.
  
  • “compile”
    Default scope. Dependencies are available in all classpaths. Propagated to dependent projects
  • “test”
    Only available for test compilation and execution. These are not transitive
  
  
  • “provided”
    Expect the JDK or the container to provide at runtime.
  
  
  • “runtime”
    Not needed for compilation but for runtime and test execution.
  
  
  • “system”
    Similar to provided but need to specify the JAR file.
• systemPath
  Used when dependency scope is system. Example: ${java.home}/lib

Plugins are used to customise the build for a project.

Maven Jar Plugin

• Used to set the manifest for the JAR file.

Modules

• Can contain a project with multiple modules.
• Dependency modules are always build before dependent modules.
• Have to mention the parent information in the sub module

Property File

• All project resources are maintained in separate resource directories inside main.
  src -> main -> resources
  src -> test -> resources
• Most of the times, property files which contain application configuration are stored in these locations.
• Can also be explicitly mentioned also in the resources section of the POM.