MAVEN

What is MAVEN ??

It is a Open source Build automation and project management tool across all segments of the Java community. It speeds up the development life cycle of a project by facilitating a uniform build system through Convention over Configuration philosophy

 Basically it helps with managing

• Builds
• Documentation
• Reporting
• Dependencies                           
• Releases

My First Maven Project

      to create the simplest maven project execute the following command

 Here we encounterd some new terms. Lets clear them. :)

• archetype => its a template of a project.It is combined with some user inputs to create a working maven project.

•  generate  => it is the goal of the project associated with the archetype mechanism.

• DgroupId => key identifier of a project.Typically the domain name of the organisaion is given

• DarchtypeGroupId  => designated group id for the plugin that created the project

•  artifact => the final output of a development project

• DartifactId => the name given to the artifact produced fro the project

Once the above command is executed the directory called my-app is created with the below directory structure.

The pom.xml file created in the project directory is significant. It is the basic unit of work in maven.It contains every important piece of information about the project. Following shows the POM.xml file

• project             => top level element in all maven pom.xml files. Specifies   the Urls from where the maven dependencies required for the project need to be downloaded.

•  modelVersion  => the version of the object model this POM uses.

• groupId, artifactId => as specified  in the command used to create a maven project

• packaging  => type of the package used by the artifact. eg: JAR, WAR etc.

• version  => version of the artifact generated by the project. SNAPSHOT indicates that the project is in the state of development.

• name  => indicates the display name used for the project

•  url  =>  indicates where the project site can be found

Other areas that can be included in a POM.xml file are

•  dependencies
•  developers and contributers
• plug-in lists
• plug-in executions
• plug-in configurations

 

What is Build Life Cycle ?

  It is the sequence of phases which defines the order in which the gaol has to be executed. Here phase is one stage of the Life Cycle

 Maven has 3 standard life cycles. They are :

• Clean
• Default
• Site

Clean Lifecycle

This deletes the output of a build by deleting the build directory

 consists of the following phases

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

               

pre-clean	execute processes needed prior to the actual project cleaning
clean	remove all files generated by the previous build
post-clean	execute processes needed to finalize the project cleaning

When we execute mvn postclean life cycle, all the above mentioned 3 phases are executed.

Default Lifecycle

 This is used to build the application and is the primary life cycle of maven. Basically has 23 phases. 

Below are the main phases required to build a standard basic application.

• Validate
• Compile
• Test
• Package
• Integration-test
• Verify
• Install
• Deploy

Site Lifecycle

 This life cycle is used for the creation of the project site documentation.

pre-site	execute processes needed prior to the actual project site generation
site	generate the project's site documentation
post-site	execute processes needed to finalize the site generation, and to prepare for site deployment
site-deploy	deploy the generated site documentation to the specified web server

 

 

 

 

 

REFERENCES USEFUL

https://www.mulesoft.com/tcat/tomcat-maven

tomcat manager
http://blog.techstacks.com/2009/05/tomcat-management-setting-up-tomcat.html