$ mvn dependency:go-offline
caches all the dependencies for offline/remote development. It is documented at https://maven.apache.org/plugins/maven-dependency-plugin/go-offline-mojo.html
But, how do we go back online again?
$ mvn dependency:go-online
is not a valid goal.
Thanks.
Check dependency:go-offline goal's documentation .
In the description it states:
Goal that resolves all project dependencies, including plugins and
reports and their dependencies.
Emphasis mine.
This goal just tells Maven to resolve everything this project is dependent on (dependencies, plugins, reports) in preparation for going offline. So it just fetches locally all required stuff and nothing more.
Offline mode is enabled only when you provide the -o flag on a appropriate command ex. mvn -o install and for the scope of this command only.
In the above command, if -o is specified, maven will not check online for updates of dependencies,plugins etc and will try to retrieve them from the local repository. That's why you have to execute the aforesaid goal of maven dependency plugin before, in order everything to be available for offline mode.
Related
Maven -T not working with release plugin
I start to write as answer cause the comment area is too limited.
The mentioned point 2. must have failed with an error cause -T requires parameters (Missing argument for option: T`)
Furthermore the given call release:prepare release:perform clean install deploy is simply wrong.
Let us begin with some basics. A combination of install and deploy shows that there is a misunderstanding about the Maven life cycle.
So using install only makes sense if you want to install the artifacts only into your local repository ($HOME/.m2/repository) to be consumed by other project on the same machine which is usually not the case.
Using deploy (which includes install) is used to upload the created artifacts into a remote repository (like Nexus, Artifactory) which is in corporate environments the case.
Based on the output I can see that you are using extremely old plugin versions like maven-dependency-plugin:2.1: this version is ten years old. Furthermore I see the usage of a sources goal which is used to resolve sources of the dependencies where I would ask: Why do you need that?
The mentioned point 1:
mvn deploy -U -T 1C -DskipTests -Dmaven.install.skip=true
this shows that you have not understand the purpose of install and deploy phase cause the install phase is needed to install the artifacts and deploy phase will transfer them to the remote repository which means it does not make sense to skip the install part (I doubt that this will work). Furthermore using -U only would make sense if you have SNAPSHOT dependencies otherwise this is waste of time.
The usage of -DskipTests gives me the impression you seemed to have long running unit tests (or they might be integration tests instead?)...
To make a release with Maven you should go:
mvn release:prepare release:perform
Nothing else. Based on the supplemental parameters you are giving during a release it looks like your pom files seemed to be not in optimal state.
The given option -DcheckModificationExcludeList=pom.xml looks from my point of view like a problem cause usually you don't need that and furthermore during a release the pom.xml will be changed (the version) so from that point of view it does not make sense. The modification is to check if something not checked in before running a release..(The whole thing looks not concise to me).
Based on the error message you have given:
[ERROR] Failure executing javac, but could not parse the error:
I bet your maven-compiler-plugin version is very old? Which version do you use?
I recommend to use an up-to-date version of maven-release-plugin which is hopefully correctly configured in your pom file (which I can't tell you cause you haven't showed the full pom files).
Also I recommend to use a most recent version of Maven and check all plugins (using most recent versions) and in particular the configuration of the appropriate plugins if the configuration is correct and really needed and fulfills your needs.
I am learning about Jenkins and I have to explore some existing build jobs that others wrote (in the company that I'm working).
So I am trying to understand a job which uses mvn command.
So under the build part (inside the job), I see these details:
Maven version: 3.0.5
Root POM: pom:xml
Goals and options: clean install -U -Pnotest,docs
I'm trying to understand what this mvn command means?
I tried to google it: "clean install -U"
But I didn't find what the parameter U means.
And I don't know what is "-Pnotest,docs".
can you guide me regarding how I can find what's it? (maybe "-Pnotest,docs" is from a xml file or it's from the artifactory etc..)
Thanks a lot!!!!
-U Forces a check for miss releases and updated snapshots on remote repositories
If Maven is regularly used in your company, and you will have to work with it on a day-to-day basis, I would advise you to find a mentor (any colleague that knows the tool well and is ready to share its knowledge with you) and work with them. Maven, when you first look at it, can be quite of a mouthful and you'll learn it more efficiently with their help.
For the problem at hand, Elarbi Mohamed Aymen's answer already tells you what the -U flag corresponds to. As for -P, it is used to activate profiles (in your case notest and docs). These profiles are usually defined in the pom.xml of the project being build.
See Running Apache Maven for the basic commands, and as advised on that page run mvn -h to have the complete list of flags the command can use.
Maven is one of the mechanism how to handle the build process and check project dependencies, especially for Java.
One of the option can be to have physically included dependencies (artifacts / libs) in the project, but its not so useful- in case of new version, you have to replace the file, sometimes you are using same lib in more apps, ten you have to handle it manually in all projects.
Except this, there is the maven- it has a global repository with shared artifacts / libs , which are common used- ref. https://repo1.maven.org/maven2/.
Except this, you can make your own libs/ artifacts in this case, its a modules / applications which are reusable, then you are storing it in private repository- this is the artifactory.
When you want to build your project, in case of maven project you have pom.xml , which is like manual for maven what to do / how to build.
clean and install are common goals, clean will wipe your local maven repository, install will download them again, with parameter -U it force to download them.
You can define your own goals in pom file, eg. to "tree build"- build some dependent modules, then build parent project.
Eg. with -D you pass parameters to the maven eg.
mvn archetype:generate -DgroupId=com.mycompany.app -DartifactId=my-app
- that will generate new project, based on given archetype- "template", with the given groupID and artifactID- groupID can be eg. company name, artifactID is then the name of specific app / component.
-P,--activate-profiles <arg> Comma-delimited list of profiles
to activate
-D,--define <arg> Define a system property
I have eclipse ide with m2e plugin, maven and weblogc app server running from my local box.
I have imported someone else's multiple maven projects from bitbucket to my box. I was told that one of them is main and rest are dependencies in which I never seen anything like that before. I have always dealt with single maven project. Anyhow from the instruction, it says I have to run maven command such as "clean install -U".
In the IDE so I touched run configuration for each mvn project by setting goal as "clean install -U". By reading maven guide, I kind understand what each term means but when you combine together with a passing parameter, what does it do actually? I didn't expect a jar (web app) to be deployed to an application server but it did also.
-U forces maven to check any external dependencies (third party dependencies) that might need to be updated based on your POM files.
clean install are both basic maven lifecycle phases (https://maven.apache.org/guides/introduction/introduction-to-the-lifecycle.html).
install normally would simply take the artifact that is built and put it in the local repository, i.e. a directory on the box you are building on (.m2 directory most of the time). It would not do a deployment to a server - typically the deploy phase would be used to do that.
However, developers can override and add to what maven does in the various phases, so just like in the days of ant things can easily devolve into chaos no one can understand on complex projects ;-).
sometimes in the integration-test phase, developers will tell maven to start up a container temporarily to run the web app on, so that tests can be run against it, and then that container is shut down when the integration-test phase completes.
We have three artifacts:
common.jar : with common classes.
public.war : depending on the common.jar, contains only public site resources.
internal.war : depends on both common.jar and public.war, adding authentication
information and security context resource files. Also contains
few administration site classes.
Currently I have structured these in such way, that internal.war overlays itself with public.war.
Building the project locally, installing the artifacts to local repo, works perfectly.
Problems start when trying to get the Hudson builds working with following sequence:
Build all projects in dependency order.
Modify common.jar (say, add a new class method)
Modify internal.war classes in such way that they are compile-time dependent on changes done in 2. step.
Commit both changes, triggering the Hudson builds.
Internal.war build fails because it can not find the symbols added in step 2.
Somehow the build in step 5. is using an old version of the common.jar, and failing because of it.
The common.jar version number does not change, let's say it's 1.0.0-SNAPSHOT for the purposes of this example.
If I DO change the common.jar version number, the build works. (Supposedly because there is only one release by a release version number).
Now, what could cause this using of old artifacts in Hudson builds?
We are running maven builds on Hudson with command "clean package -e -X -U"
"Deploy artifacts to maven repository" has been checked.
It's hard to definitively answer this without access to the real poms, but here is what I would do:
1) Make sure Hudson is using the exact same version of Maven as you are on your local machine
2) Examine the effective pom.xml of internal.war on the Hudson machine in a terminal via mvn help:effective-pom making sure you are running the same mvn executable as your Hudson job does. You need to verify the version of the common.jar in the effective pom.xml of internal.war. It could be different than what you expect due to profiles or settings.xml differences.
3) Check the settings.xml file for your Hudson install of Maven. In particular you need to verify all is well in your distributionManagement, servers, and repositories stanzas. Another good way to check this is to go to your internal.war project and run mvn help:effective-settings and see if what is there matches what is on your local machine.
Something is awry and it won't take long to find with the right analysis.
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?