how to run a project using maven

[Vani Shastri]

hi,
I am new to maven. I have a few doubts -

1. where does the local repository get created once maven is installed?
2. The directory structure like src,main,target etc... do they get created automatically. i mean where are the artifacts placed? do we have to create the structure explicitly?
3. how to customize the settings.xml n how to run a sample project on maven?

help needed.

Thanks.

[Tim Holloway]

I'm not a Maven maven, but a number of popular project types come with a prototype option so you can use Maven to build a blank project with the appropriate deirectory structures and files. I actually made a prototype myself for JSF/Facelet/JPA/Hibernate webapp projects. The process is fairly simple and it's documented on the maven.apache.org site.

Config info is kept in a per-user config directory whose name depends on what version of Maven you're using.

[Nathan Pruett]

1. The local repositorygets created in the %USER_HOME%/.m2 directory by default, though this can be configured to go to another location.

2. In general, no - Maven creates the directory structure for you when you create a Maven project through the archetype plugin.

3. As for the settings.xml - Reference to Maven's settings.xml. As for the second part of this question - that's a big topic - I'd agree with Tim that you should probably look at some projects that already use Maven and see how they do things.

[Tim Holloway]

"Archetype" is the Maven term I was thinking of when I said "prototype project".

You can see the use of an archetype in the 5-minute getting started guide:
http://maven.apache.org/guides/getting-started/maven-in-five-minutes.html

For custom archetypes, see http://maven.apache.org/guides/introduction/introduction-to-archetypes.html

[Vani Shastri]

Thanks for guiding me.

While running the command for creating the archetype -

mvn archetype:create -DgroupId=com.mycompany.app -DartifactId=my-app

initially the error said - no archetype plugin found. I copied the archetype plugin into the lib folder of maven. Now the error says -

Internal error in the plugin manager executing goal 'org.apache.maven.plugins:maven-archetype-plugin:1.0-alpha-3:create': Cannot find Plexus container for plugin: org.apache.maven.plugins:maven-archetype-plugin

where do i find plexus container?

[Vani Shastri]

i copied the plexus containers from the maven site. Still, m getting the same error.

[Simon Joseph Aquilina]

Hi,

if you have an internet connection on, then maven should download all the plugins you need automatically! If this is not happening, then I sugest you connect to the internet and try that command again! If it still does not work then maybe the remote repository has been labeled as not accessable! What I did for this is delete the repository folder in the .m2 folder, make sure you are connected to the internet, and try that command again!

Regards,
Sim085

[Vani Shastri]

the plexus container issue is still not resolved...
the steps i followed -
1. unzip maven
2. set the JAVA_HOME variable to the JDK
3. set the PATH variable to the maven's bin
4. execute mvn --version, to see the version which is in use
5. create a project -
mvn archetype:create -DgroupId=com.demo.app -DartifactId=my-app

At this step, i get an error - The plugin 'org.apache.maven.plugins:maven-archetype-plugin' does not exist or no valid version could be found.

I downloaded archetype plugin explicitly....now the error says - plexus container not found in the plugin. I even downloaded plexus container jars. Still the error exist.
I am connected to the internet for maven to download plugins during run time for all the operations.

Where am i going wrong?

[Vani Shastri]

my local repository is not getting created? does unzipping maven itself create a local rep .m2?
any settings to be done in settings.xml?

[Vani Shastri]

I got it....it was with my settings.xml - proxy settings.
Thanks to all for guiding me.

[Murali Mohan Atmakuri]

hi,

Could you please let me know how you resolved it because i am facing the same problem.

Thanks,
Murali

[Arundhathi Menon]

Vani,

I have changed the settings.xml to have the right proxy and have configured the mirror as well.

My error is -

[WARNING] *** CHECKSUM FAILED - Checksum failed on download: local = 'ea866874c9
68b794a16d61f6a2f8351273e30e66'; remote = 'b0280b2e376542c692104f38b14a4892e509a
379' - IGNORING
[INFO] ------------------------------------------------------------------------
[ERROR] FATAL ERROR
[INFO] ------------------------------------------------------------------------
[INFO] The PluginDescriptor for the plugin Plugin [org.apache.maven.plugins:mave
n-archetype-plugin] was not found.
[INFO] ------------------------------------------------------------------------
[INFO] Trace
java.lang.IllegalStateException: The PluginDescriptor for the plugin Plugin [org
.apache.maven.plugins:maven-archetype-plugin] was not found.
at org.apache.maven.plugin.DefaultPluginManager.addPlugin(DefaultPluginM
anager.java:317)


Can you please help

Regards
Menon

[barron logan]

Vani,

What exactly was the problem with your proxy settings....
Can you expand on how you resolved this. I am having the same issue.

[Arundhathi Menon]

The problem was because the internet policy in our company was obstructing the download of the jars. So when maven runs , it tries updating the respo and fails.

Check with your network administrator, if you are getting the same problem even after the proxy settings are right.

regards
Menon

[David Newton]

DontWakeTheZombies

(Although I guess following up a year and a half later might help somebody.)

[Arundhathi Menon]

Yes David

Was going through the old Maven posts and realised I had not posted the solution. Its a very common prob and this might come into some use for someone!