What is pom packaging in maven

Question

I was given a maven project to compile and get deployed on a tomcat server  I have never used maven before today  but I have been googling quite a bit  It seems like the top level pom xml files in this project have the packaging type set as pom   What am I supposed to do after mvn install to get this application deployed  I was expecting to be able to find a war file somewhere or something  but I guess I am looking in the wrong place or missing a step

User · Answer

Packaging of pom is used in projects that aggregate other projects  and in projects whose only useful output is an attached artifact from some plugin  In your case  I d guess that your top-level pom includes  lt modules gt     lt  modules gt  to aggregate other directories  and the actual output is the result of one of the other  probably sub-  directories  It will  if coded sensibly for this purpose  have a packaging of war

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pom is basically a container of submodules  each submodule is represented by a subdirectory in the same directory as pom xml with pom packaging   Somewhere  nested within the project structure you will find artifacts  modules  with war packaging  Maven generally builds everything into  target subdirectories of each module  So after mvn install look into target subdirectory in a module with war packaging   Of course     find   -iname    war    works equally well  -

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I suggest to see the classic example at  http   maven apache org guides getting-started index html How do I build more than one project at once  Here my-webapp is web project  which depends on the code at my-app project  So to bundle two projects in one  we have top level pom xml which mentions which are the projects  modules as per maven terminology  to be bundled finally  Such top level pom xml can use pom packaging   my-webapp can have war packaging and can have dependency on my-app  my-app can have jar packaging

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pom packaging is simply a specification that states the primary artifact is not a war or jar  but the pom xml itself   Often it is used in conjunction with  modules  which are typically contained in sub-directories of the project in question  however  it may also be used in certain scenarios where no primary binary was meant to be built  all the other important artifacts have been declared as secondary artifacts   Think of a  documentation  project  the primary artifact might be a PDF  but it s already built  and the work to declare it as a secondary artifact might be desired over the configuration to tell maven how to build a PDF that doesn t need compiled

User · Answer

Packaging an artifact as POM means that it has a very simple lifecycle  package - gt  install - gt  deploy   http   maven apache org guides introduction introduction-to-the-lifecycle html  This is useful if you are deploying a pom xml file or a project that doesn t fit with the other packaging types   We use pom packaging for many of our projects and bind extra phases and goals as appropriate   For example some of our applications use   prepare-package - gt  test - gt  package - gt  install - gt  deploy   When you mvn install the application it should add it to your locally  m2 repository  To publish elsewhere you will need to set up correct distribution management information  You may also need to use the maven builder helper plugin  if artifacts aren t automatically attached to by Maven

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https   maven apache org pom html  The packaging type required to be pom for parent and aggregation  multi-module  projects  These types define the goals bound to a set of lifecycle stages  For example  if packaging is jar  then the package phase will execute the jar jar goal  If the packaging is pom  the goal executed will be site attach-descriptor

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POM Project Object Model  is nothing but the automation script for building the project we can write the automation script in XML  the building script files are named diffrenetly in different Automation tools  like we call build xml in ANT pom xml in MAVEN  MAVEN can packages jars wars  ears and POM which new thing to all of us  if you want check WHAT IS POM XML

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Real life use case At a Java-heavy company we had a python project that needed to go into a Nexus artifact repository   Python doesn t really have binaries  so simply just wanted to  tar or  zip the python files and push   The repo already had maven integration  so we used  lt packaging gt pom lt  packaging gt  designator with the maven assembly plugin to package the python project as a  zip and upload it  The steps are outlined in this SO post

User · Answer

To simply answer your question when you do a mvn install  maven will create a packaged artifact based on  packaging attribute in pom xml   After you run your maven install you can find the file with  package extension   In target directory of the project workspace Also where your maven 2 local repository is search for   m2 respository  on your box  Your artifact is listed in  m2 repository under   groupId artifactId artifactId-version packaging  directory If you look under the directory you will find packaged extension file and also pom extension  pom extension is basically the pom xml used to generate this package  If your maven project is multi-module each module will two files as described above except for the top level project that will only have a pom

User · Answer

pom    packaging is nothing but the container  which contains other packages modules like jar  war  and ear    if you perform any operation on outer package container like mvn clean compile install  then inner packages modules also get clean compile install   no need to perform a separate operation for each package module

[java] What is "pom" packaging in maven?

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