I'm trying to understand some concepts about maven. This is the my scenario:
Almost every time I deploy a project, i.e Cloudstack I type:
mvn install
I got some failures like unable to connect to some repositories or that some tests just failed. I don't understand why some tests can fail if the code has been recently downloaded.
My idea is to create a local server repository so maven won't connect to remote servers but to a server that is in the same network with the packages that the application needs.
Is possible to do that? or does these problems are produced by other cause?
See Maven, Introduction to Repositories:
There are strictly only two types of repositories: local and remote. The local repository refers to a copy on your own installation that is a cache of the remote downloads, and also contains the temporary build artifacts that you have not yet released.
Remote repositories refer to any other type of repository, [...]. These repositories might be a truly remote repository set up by a third party to provide their artifacts for downloading [...]. Other "remote" repositories may be internal repositories set up on a file or HTTP server within your company, used to share private artifacts between development teams and for releases.
mvn install does not deploy your project's artifact (at least not in the sense of Maven's deploy, see Introduction to the Build Lifecycle). It does:
install the package into the local repository, for use as a dependency in other projects locally
whereas mvn deploy is:
done in an integration or release environment, copies the final package to the remote repository for sharing with other developers and projects
„unable to connect to some repositories“ and „some tests just failed“ are two different kind of errors. It's impossible to tell more without any relevant part(s) of the output of the build where these occurred.
Related
I've tried and failed to find an easy way to control my local repository and to work with remote repositories.
I don't think, I need whole repository management tool (such as Nexus or Artifactory) to do simple tasks, such as:
List locally installed artifacts
Show informations about artifact from repository (both local and remote)
Verify PGP signatures for artifact (locally after fetching the artifact, or remotely if possible)
Download artifacts by selector into local repository (can be mvn dependency:get)
Download artifacts javadoc/source into local repository
Verify availability of either sources or javadocs
Remove locally installed artifact by selector (either shorthanded gradle or longer mvn cli type)
Every single clue I've found was linked to specific build-script/system (ivy,grape,pom,gradle, ..), and I don't think I should have to create dummy project or directly touch files in repository manually.
If you come up with suggestions, I use unix-based platform and primarily CLI, but suggestions are welcomed for all platforms and UI variants.
I am lacking some basic understanding of using a repository manager for our projects. What I don't know is how, if I use a repository manager, if I run a local install command Maven doesn't deploy the package to something like a shared Nexus instance. I seem to have some confusion between local repositories and shared ones when using a repository manager.
Apologies for the naivity and for not testing this myself. We have started versioning our application and using a shared file system approach to getting artifacts and are left with a few questions about what, within the scope of what we are currently doing, will be gained by using a repository manager instead. We do use TeamCity as a build server which is deploying to that currently used file system. I need to know some answers to a few questions before POCing a repo manager.
install is specific to the local repository.
From Maven's point of view whether a remote repository is hosted by your repository manager or is completely external has no relevance - when you're adding your artifact to any kind of remote repository, you need to use the deploy plugin (or release for non-trivial deployments).
Repository managers usually generate instructions on configuring your projects for deployment to a hosted repo.
maven defines a lifecycle (clean, compile, install, deploy...). There are default mappings when you execute "mvn install". So maven knows which plugins to execute for that maven goal.
The Introduction page gives a good overview what happens for each phase (goal) and what the default plugins are: https://maven.apache.org/guides/introduction/introduction-to-the-lifecycle.html
In your case: mvn install will copy the artifacts into the local maven repository to be shared by other projects you have locally.
If you want to share artifacts with other developers on other locations "mvn deploy" will copy the artifacts to the remote repository. Note you need to configure the distributionManagement section in the pom.xml to be able to do that.
The normal maven setup should look like this:
project -> local repository -> private remote repository -> public remote repository
Project: in the simplest case your project consists of source files and a configuration file (pom.xml). The project may depend on third party libraries like junit. The jar files of the libraries are not stored in your project directory, only the information which jars are needed.
mvn package
This command creates a jar out of your project an places it in the target/ folder of your project.
Local Repository: This is a maven repository stored locally on your machine. It normally resides in ~/.m2/repository/. Every dependency you are using in your project will be stored in this repository. On compiling your project, maven will use the jar files from this location.
mvn install
This command creates a jar file and copies it to your local repository: ~/.m2/repository/groupId/artifactId/version/project.jar. Now you can use this jar in different independent projects as a dependency, but only your machine.
Private Remote Repository: Most of the time this is a Nexus in your company network. This server allows to share the build project across developers. Your TeamCity server builds the jar and copies it to your nexus server. Beyond this the nexus server works like a proxy, e.g. A Developer needs junit-4.1.1.jar, so the server looks for it on public remote repositories and caches it.
mvn deploy
This command builds a jar and sends it to your nexus server ('to your private remote repository') After that every developer inside your company network can access the jar.
Public Remote Repository: These are repositories available on the internet which contain several jar files, e.g. maven.codehaus.org
Summary:
If you call mvn compile maven looks for the dependencies in your local repository. If maven can't find them, it will ask the (private/public) remote repository, and copy the files to the local repository.
You should not synchronize a local repository over network, since this type of repository is not targeted at such use and may break in some obscure way.
What you need is a mvn deploy - copies the final package to the remote repository for sharing with other developers and projects
mvn install you tried will just build and install the project in your local ~/.m2 repository. It will_not publish the artifacts to your nexus repository which you have configured.
Both install and deploy are valid build phase - meaning it executes all previous phases. Please refer to Maven docs below for more understanding.
From maven documentation:
the default Maven lifecycle has the following build phases (for a complete list of the build phases, refer to the Lifecycle Reference):
validate - validate the project is correct and all necessary information is available
compile - compile the source code of the project
test - test the compiled source code using a suitable unit testing framework. These tests should not require the code be packaged or deployed
package - take the compiled code and package it in its distributable format, such as a JAR.
integration-test - process and deploy the package if necessary into an environment where integration tests can be run
verify - run any checks to verify the package is valid and meets quality criteria
**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.
I am in a situation where I have one Build Server box which is to carry out all continuous integration and manage our maven repository. The box works as follows:
There is one maven repository which is hosted through Apache Server as a URL for developers to use
All Jenkins jobs (including release jobs) run mvn install so that artifacts are kept in this one repository.
I would like to get rid of the Apache server and run Nexus on this same box to manage and host repositories, however I have the following questions/ideas:
With Nexus and Jenkins on the same box, will it mean that I will have to manage two repositories, one where maven installs an artifact to a local repository, and one where maven deploys an artifact to nexus? Would it be possible to have Nexus manage the "mvn install" repository also? How can I make sure we don't run out of disk space on the server very very quickly all the time?
Thanks
Added as response to comments: Thank you both, I am thinking I will just set the Jenkins jobs and release plugin goals to mvn package deploy:deploy in order to skip the install phase, that way, artifacts go directly from the target directory to Nexus. However I guess the Jenkins job will require a local repository from which to use depedencies which will get copied from Nexus to the maven local repository during the build, I am not sure if this can be avoided though.
mvn install installs in the local repository
mvn deploy installs to the remote repository
these semantics are defined in the lifecycle and map to different plugins. Their implementations are different.
You don't have to manage the local repository. Actually for some if not most jobs you might even want to define it localized to the job (with the 'Use private Maven repository' option) instead of to the user who is running the job, especially that you plan to use nexus for repository.
You will have to change your jobs to use mvn deploy instead.
How can I make sure we don't run out of disk space on the server very
very quickly all the time?
Configure Jenkins/Nexus. Discard old builds and disable automatic artifact archiving. Both settings can be found in the Jenkins job-configuration. Also you could delete old artifacts automatically from Nexus using Scheduling Tasks.
There is no need to install the artifacts into the local maven repository when using Jenkins/Nexus on a dedicated server.
Is it possible in someway to configure my build job such that rather than picking maven artifacts from the central repo , it picks them from the local maven repo. residing on my system?
NOTE - I want others to be able to run build jobs via jenkins , while pointing to my fusion repo.
Thanks
If you want to share a maven repository with multiple users I recommend to use a repository manager see maven repository management. The mostly used once are Artifactory and Nexus. This can handle the central repo as well as own managed repositories by ThirdParties or by your self. They also work as proxy to reduce the bandwidth used in your organisation.
Much easier method to achieve local-only maven builds.
Just use the offline flag (-o):
mvn -o clean package
Maven will build off your local repo directly and will not pull down updates.
I'm new to maven project.
I'm changing an ant project to maven project.
To install the 3rd party jar's in maven local repository, I used install command.
Its trying to download the resource jar.pom.
I don't have download access in my organization so the build failed for installtion.
After request i got the resouce jar and clean jar in my desktop(also i can get other necessary jar).
How to make maven to use these jar for the process and how to install the jar in local repository without internet acess.
I downloaded the jar and placed in local repository but it couldn't point the path and use those jars.
please let me know what steps i have follow to run maven install and other commands to build the project without internet access.
where should i placed the jar which i have downloaded by external way.
Please guide me for building and deploying the project.
Thanks in advance.
http://maven.40175.n5.nabble.com/Maven-installation-and-using-in-project-without-Internet-conncetion-tp4564443p4564443.html.
http://www.coderanch.com/t/544641/Jobs-Offered/careers/Maven-installation-project-without-Internet#2471141
I've posted same question in these link
You need an internet connection. Maven isn't initially self-sufficient. It needs to download a bunch of plugins along with their dependencies and the dependencies of your own project. And this really depends on what sort of settings you have for your projects. One set up will require one set of dependencies, another - a whole different one. You can't download artifacts from the Maven Central manually and then install them locally one by one. Simply put, that sounds stupid.
I understand that you're coming from the Ant world where Ant has everything it needs on the local file system. However, Maven relies on the fact that it will have a central repository (either Maven Central, or your own repository - Nexus, Artifactory, etc.) from which to download the plugins and dependencies it needs. There is no point in you migrating to Maven, unless you'll be allowed access to the Central Maven Repository.
Yes, indeed, you can run Maven offline and you can have Maven produce a local repository for you to use when you are in offline mode. However, what you're trying to do is against Maven's principles.
If your company won't allow access to Maven Central, just stick to Ant. Your effort will be a waste of your company's and, ultimately, your own time.
In fact the maven strenght is mainly in the internet accessible repositories and automatic dependency management. But it's possible to use this tool to build your project if you have all dependencies required for your project in your local repository. Then you may use -o option for offline mode and maven will not try to download updated artefact versions.
To get the artifacts into you local repository you have several options:
1) connect to the internet once and mvn build the project (this will download all required dependencies)
2) install dependencies as jar to the local repository manualy (using appropriate mvn command)
I think the questioner is looking for -o or --offline option for mvn. This is a command line option and can be provided while executing.
I think you can setup your repo correctly and execute the mvn goals once when you are connected to internet and use the -o option for later executions .
Hope this helps.
~Abhay
You can configure maven to run in offline mode. Add this entry to your settings.xml
<offline>true</offline>
See here for further information:
http://maven.apache.org/settings.html
Before you can use offline mode, you have to install all necessary third party jars to your local maven repository.
mvn install:install-file
-Dfile=filename.jar
-DgroupId=com.stackoverflow
-DartifactId=artifact
-Dversion=1.0.0
-Dpackaging=jar
-DcreateChecksum=true
-DgeneratePom=true
It's much easier to get those jars in your local repository using an internet connection and online mode.
It's possible to install these resource jars in your local maven repo using install-file. This will make the available to the build. You'll have to do this for each individually, but once that's done you won't have to do anything special.
To be clear, maven puts everything in your local repository, both the jar you're building with this project and the various library jars. Because your system cannot be connected to the internet to maven can populate the local repo with your libraries, you'll have to use this manual approach.
Edit: You should be able to run install-file anywhere. When you do, you'll need to provide the groupId, artifactId, version, and packaging using the command line options. If you already have a POM file for the library, you can provide that instead via -DpomFile=your-pom.xml.
This question has some useful info: How to manually install an artifact in Maven 2?