import as existing maven project


while importing as existing maven project i see some projects have single pom.xml some other projects have top level pom and also sub level pom.xml as well. why we need like parent pom and child pom kind of structure for some projects?
please advise
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

mccarlIT Business Systems Analyst / Software DeveloperCommented:
Sometimes an application is best structured as a number of individual "projects", be it because it is very big or other considerations. But often, each project requires settings that are common to the entire group of projects. The parent/child pom structure is used to support this. You can put common settings, dependencies, properties, etc in the parent pom and each child pom references it as its parent and therefore gets all the settings from there. These settings, properties, etc can be overridden in the child if need be.

The other use of the parent/child structure is that it can be used to build the entire set of projects, by setting up the parent pom with references to its children and then invoking Maven on the parent pom and each child gets built too.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
gudii9Author Commented:
any good code example illustrating this and reference link to read more about this? please advise
mccarlIT Business Systems Analyst / Software DeveloperCommented:
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.