I think there should be some difference, but can anyone tell me the details?
mvn:install copies your packaged Maven module to your local repository (by default, in ~/.m2/repository), to be accessed by other local Maven builds.
mvn:deploy uploads your packaged Maven module to another (usually remote) repository, to be accessed by other, not necessarily local, Maven builds.
See the documentation for the build lifecycle for more info.
The install phase is responsible for the installation of artifacts into local caching repositories. This basically applies to the Maven repository, but a well-known example is also the OSGi Bundle Repository supported by maven-bundle-plugin.
The deploy phase is responsible for the installation of artifacts into published repositories. This usually applies to remote repositories, but is could perfectly be a local repository exposed to the outside world.
As all Maven phases, you can do with them anything you want. You can shuffle plugin phases as you see fit, but the above semantics is the conventional one and you should stick to it in order to be consistent with the default phases of other plugins' goals.
mvn:deploy performs deployment to remote reposiory/environment, mvn:install installs all compiled packages to a local repository making them available to other builds performed on the local machine.
In one sentence: mvn:install compiles and installs your component in your local Maven repository, so that you can use it when other components used and developed locally depend on it. mvn:deploy deploys your (previously installed) component to a remote repository.
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I am setting up an ant build system on a project with dependency resolution being managed by ivy. I have it up and running with the file system being used for the local and shared repository currently. My ultimate goal would be that when developers are fixing bugs or creating new functionality, they would only be able to put artifacts into their local repository. When they belive their code is ready to be used by the rest of the team, it would be promoted to the proper branch in SVN and the group in charge of doing official builds would compile and publish the new artifacts.
So I guess my questions are how can you control who can publish to a repository? Does ivy just rely on filesystem permissions?
Also, I would eventually like to make my shared repository available via http. I think I could point apache to the file system repository directories for retrieving artifacts, but how do you setup publishing to an http repository?
I would suggest that you setup a repository manager to manage your project's build artifacts.
The best choices are one of the following:
nexus
artifactory
archiva
Publishing to a Maven repository means that your artifacts can be consumed by projects using other build technologies. All modern build systems support Maven (Including ivy, see the ibiblio resolver).
You could specify three resolvers in your ivy settings file. First would be a chain resolver which include remote and local ivy repositories. Second would be a local resolver for local ivy repository. Third a resolver to remote ivy repository only.
Every developer retrieves artifacts using first chain resolver.
Usual developer publish artifacts using second local resolver.
Your special team could use third remote resolver to publish in remoter ivy repository.
To protect remote repository from usual developers place it on (S)FTP server with write protection by password.
The only problem in this case is how to set versions on artifacts so that artifacts published in remote repository in some cases override locally published in some not.
Our team used such scheme few years ago. But now we use only local ivy repositories and CI server to build and run tests from various branches. We came up to this after switching to git.
for existing ivy repo easy to setup this: rest-ivy
I get what internal libraries are. But what is the purpose of a snapshot repository in archiva?
Libraries - private releases
Snapshots - private builds?
I have archiva set up and working with LDAP, but I am wondering why I need a snapshot repository. What purpose does this solve? Why is this used in development?
Also, lets say I update a library in the internal repo. Does this automatically update in the project POM files which use Maven, or I must update those poms to use the new JAR version?
Usually before releasing a maven project, the version is -SNAPSHOT.
So with such repositories you can share fresh SNAPHOT of your project for other people in your team to test or with a ci server.
Snapshots is maven idea to give version number as -SNAPSHOT , its under development it can be change any time.
Internal repository is the release repository with fixed version number. You can modify the SNAPSHOT, but That artifact never changes after it is released.
When we use internal, if dependency does not found inside it, then it will download it from central repository of maven. where as in snapshot it does not.
I would like to know weather there is a way/plugin to build a project with maven using a remote pom.xml(http://host:port/pom.xml) with out a pom.xml file in the directory where I run "mvn install".
I need this as I want to effect maven dependencies of multiple clients by making changes to one remote file hosted at (http://host:port/pom.xml).
I am not aware of a way to do this. Generally, if you are doing development with multiple developers, you should be using source control. For example, if you are using subversion, you would just make changes to the pom, commit, and the other developers can update.
Of course using a version control is absolutely necessary...It would quite helpfull to use a Maven Repository Manager to interchange the artifacts with each other simply by deploying the artifacts to a central Repository Manager in your company and furthermore it will increase the build time.
If you are on Windows, you can try mapping the remote location (possibly a network share or an FTP location) to a local drive, and then executing the maven command in your console for the mapped location. It should work.
Else, you can distribute the pom.xml file via an email and ask the users to use it as their project file.
The other option is to use a Version Control System (VCS) such as Mercurial and keeping your pom.xml stored in the repository and make it accessible for the users to checkout. So far, this is the best way to make sure everyone is using the same file.
I have open-sourced some of my projects. I'd like to publish the artifacts in a common place. If I don't have to host my own repository, that would be ideal, otherwise I will have to setup my own instance of Nexus (or other repository that you recommend).
Can I publish artifacts to Maven Central? What process do I need to follow to get them there?
Yes you can, especially if it is an open source project. Here is some info:
http://central.sonatype.org/pages/ossrh-guide.html
My team uses an internal team maven repo that is shared from a development server using Apache. We also run the Continuum CI server on the same machine. Maven builds in Continuum are run with the "install" goal, which copies the final artifact directly into the shared directory.
The question is, what is the difference between adding files to the shared repo using mvn install and using the deploy goal (mvn-deploy plugin)?
It seems to me that using mvn deploy creates additional configuration hassles, but I have read somewhere that installing files into a shared repo is a bad idea for some reason related to the internal workings of maven.
update: I get the functional differences between deploy and install; I am actually more interested in the low level details in terms of what files are created in the maven repo.
Ken, good question. I should be more explicit in the The Definitive Guide about the difference. "install" and "deploy" serve two different purposes in a build. "install" refers to the process of installing an artifact in your local repository. "deploy" refers to the process of deploying an artifact to a remote repository.
Example:
When I run a large multi-module project on a my machine, I'm going to usually run "mvn install". This is going to install all of the generated binary software artifacts (usually JARs) in my local repository. Then when I build individual modules in the build, Maven is going to retrieve the dependencies from the local repository.
When it comes time to deploy snapshots or releases, I'm going to run "mvn deploy". Running this is going to attempt to deploy the files to a remote repository or server. Usually I'm going to be deploying to a repository manager such as Nexus
It is true that running "deploy" is going to require some extra configuration, you are going to have to supply a distributionManagement section in your POM.
From the Maven docs, sounds like it's just a difference in which repository you install the package into:
install - install the package into the local repository, for use as a dependency in other projects locally
deploy - done in an integration or release environment, copies the final package to the remote repository for sharing with other developers and projects.
Maybe there is some confusion in that "install" to the CI server installs it to it's local repository, which then you as a user are sharing?
"matt b" has it right, but to be specific, the "install" goal copies your built target to the local repository on your file system; useful for small changes across projects not currently meant for the full group.
The "deploy" goal uploads it to your shared repository for when your work is finished, and then can be shared by other people who require it for their project.
In your case, it seems that "install" is used to make the management of the deployment easier since CI's local repo is the shared repo. If CI was on another box, it would have to use the "deploy" goal.