I need to know if having a Maven project, I can import external (*.jar)'s without generating a Maven dependency (POM), just importing them in the project build path.
I'm finding troubles trying to run the project when it asks me for other dependencies that I'm no able to find in the web, and I have checked that those dependencies are not necessary because I checked my code and the (*.jar)'s in a project which doesn't use Maven and it works (without the necessity of importing that libs).
You can import a jar to your local repository and reference it in the POM as usual. However, every developer needs to do the import on his/her machine (once).
see: http://jeff.langcode.com/archives/27
You need to use the goal on maven-install-plugin: install-file:
mvn install:install-file -Dfile=your-artifact-1.0.jar \
[-DpomFile=your-pom.xml] \
[-Dsources=src.jar] \
[-Djavadoc=apidocs.jar] \
[-DgroupId=org.some.group] \
[-DartifactId=your-artifact] \
[-Dversion=1.0] \
[-Dpackaging=jar] \
[-Dclassifier=sources] \
[-DgeneratePom=true] \
[-DcreateChecksum=true]
If you are using Nexus, you can upload the jar manually.
Disclaimer: the following is only applicable when working in an environment where multiple people will share the same project. If you're on your own then all that has been suggested is just fine.
I'm not fond of system dependencies or doing local imports; in both cases you're still managing dependencies per machine and that is a burden Maven should be taking away from you.
If you really have a dependency that cannot be found in any online Maven repository, I would rather take the hard but more dependable route and that is to install a local Nexus server, which you can then also setup as a nice mirror for Maven central and the JBoss Nexus so clients don't have to keep downloading dependencies off of the internet. That way you have a single machine where all your Maven dependencies are maintained, which makes it nice and controllable. Plus your Nexus is more readily available; an external Maven source may go down or become unavailable should your internet connection drop.
You can then install your jars in the Nexus (in a local repository called 'third-party' is a common strategy I have seen used in the companies I have worked for so far) and your Maven clients, if properly told that your Nexus server is a mirror, can reference the third-party Maven dependencies as if they are coming from an online one.
You can provide a System Dependency.
Related
While converting dynamic web project into maven project I'm getting this error:
"CoreException: Could not calculate build plan:
Plugin org.apache.maven.plugins:maven-compiler-plugin"
I can't access the internet to download any jars and plugins while converting because I'm on a restricted network with no internet access. Is there is any way to make a Maven project with no internet access?
I'm using:
Eclipse kepler
Maven 3.0.4
JDK 1.6
You can manually download or some how find required artifacts.(jars) Then copy them into your local maven repository.
Now you can use
mvn clean install -o // off-line build
to build your project without internet.
About half year ago, when I worked as an intern in a company, we also encountered with virtually the same problem as you ------ we were in the restricted network, and our computers couldn't access the internet, but we still needed to use maven to update the project dependencies. Here is our solution:
Find a server that can access the internet, and also you can access
the server in your restricted network.
Establish a sonatype nexus server on the server you found above.
The sonatype nexus serer is just a private repository in your environment. You can upload your own packages into the repository, and also the nexus server can download required packages from the central maven repository.
The last thing you need to do is to change the repository address in your pom.xml to the nexus server address
Hopefully, this can help you. And if you have any questions, please feel free to ask me again.
mvn clean -o install
Running in Offline Mode
If you ever need to use Maven without having access to a network, you should use the following option to prevent any attempt to check for updates to plugins or dependencies over a network:
-o, --offline
When running with the offline option enabled, Maven will not attempt to connect to a remote repository to retrieve artifacts.
refer here and here for more options
I think without internet you can not download it, initially you need an internet connection because maven need bunch of dependency and it all depend on your project. if you download them manually one by one there is some chance that you could miss some dependency and error will resolve one by one it will take more time and research to search dependency over internet and fix them one by one.
so I prefer instead of downloading manually go for internet connection it will download all the dependency automatically.
if you have restricted access download it at home and replace that folder with your work area folder
Maven is a dependency management system which downloads the required dependencies from the internet or a mirror of the central maven repository. Incase you do not have both - connection to internet (Central Maven Repository) or a local mirror (Nexus is the most used replicator of the central maven repository in a Enterprise setting) - then maven is bound to get the dependencies off your local hard disk from the .m2 folder under your logged in user directory.
Hence, in order for maven to work, manually register all dependencies which you have listed in the pom(s) as described in the maven guide :
mvn install:install-file -Dfile=<path-to-file> -DgroupId=<group-id> -DartifactId=<artifact-id> -Dversion=<version> -Dpackaging=<packaging>
You can try copying your .m2 folder to the machine without internet... and then running maven offline.
How does my firm get a jar into a maven repo so maven projects can access it from inhouse.
Can someone please point me to a good step by step details on how to do the following
Make a jar with Maven
Get the jar installed into a local maven repo
I doubt your company wants their private internal code hosted on a public repository:
Install your own repository server inside your own network, I use Archiva. This is the most ideal solution, then you can set up Mavenized projects to automatically upload themselves to your private repository when you do mvn:release and everyone will see the new versions. How to use Archiva is all very well documented.
If they have open source code that want to share, that is different:
You can publish public facing open source code through Sonatype.
If you just want to install a dependency to a local repository:
If you just want to install a .jar locally that is easy and well documented.
mvn install:install-file -Dfile=path-to-your-artifact-jar \
-DgroupId=your.groupId \
-DartifactId=your-artifactId \
-Dversion=version \
-Dpackaging=jar
I am a Maven newbie and spent hours to learn the basics, but I still have not found any good documentation how to install locally a 3rd Party JAR with all its (transitive) dependencies.
I know mvn install:install-file does install a single JAR. But how to install locally in the repsoitory something like this:
+ Parent.jar
+ ChildA.jar (Requuired by Parent)
+ ChildB.jar (Required by Child A)
To make it more complcated and real life: Parent.jar and ChildA.jar are legacy/commercial Jars not available in the public maven Repository but the Child B is a jar that is found in the public repository (for example like a logging jar).
UPDATE: I do not only want to install them locally (with a system dependency) but to also "correctly" integregrate them with maven so i can redistribute this dependency tree to other developers or the public (and I assume this is important for maven), so that maven knows and understands the dependecytree (to avoid version conflicts, unnecessary downloads etc...)
Any links or information how that exaclty describe how this can be done would be great.
Thank you very much!!
Marks
If it's a commercial jar, you may be in violation of the license if you deploy it to a central repository, and the only recourse is to deploy to your company's repo (if you have one setup).
In order to do that you need to define a pom for childA, specifying childB as a dependency, then run the install:install-file goal for that. Then do the same for parent, with childA as it's dependency.
Once you do that, you can then take those items, and upload them pretty easily to your company's central repo through it's GUI (both Nexus and Artifactory support this through the GUI).
Since you actually want to actually publish so that others in the public can use it with the defined dependencies, you pretty much have to get the 3rd party jars into a publicly available repo.
Here are instructions on how to accomplish that.
Please note though, the licensing for the code may not allow you to publish it to a central repo. This is checked before it can be deployed.
I think, you maybe look for this.
Maven will load all needed dependecies into the local repo itself if they are availebale in the online repo. If you want to install your own projects, setup the reactor with profiles to have all wanted modules in it and run mvn install -P yourprofile on it. More about profiles can be found here. Afaik is there no way, to install projects including their dependencies into the local repo.
if you need to install it to a local Maven repository, just use
mvn dependency:go-offline
Here's the problem: I love using Maven, as it completely simplifies development and dependency management. However, I'm working with a server which isn't Mavenized, so I can't just add it as a provided dependency. Is there a way to simply specify an additional library folder and add it to the Java compiler classpath, or would I need to actually create an entire local Maven repository for this? I know it completely limits my portability, but I'm okay with that. Thoughts? Also, after compiling, I'll need to copy all of my non-provided dependencies to the local server lib directory, I assume I can use the copy-dependencies plugin to move everything over.
Download Nexus for free from Sonatype, or Artifactory, or any of the other repository managers.
The alternative is to learn about install:install-file to shove jars into your personal local repo. However, having a full repo as above has so many advantages (not the least speed via caching) that it's easier to just install one.
You can use a Maven2 repository implementation such as Nexus, Artifactory, or Archiva.
You can create a simple POM for the non-maven dependency you are working with and use the deploy:deploy-file goal to deploy it to the repository.
If you just need the dependency locally you can use the install:install-file to install the dependency in your local repository. This approach requires nothing more than maven be installed on your machine.
If you just want to add libraries to the path of your build without worrying about repositories you can declare them as system dependencies. I do not recommend this approach but it should work fine.
Some 3rd party JAR files are not found in the public maven repository. To use them, do I need to manully add them to the local repository? Any steps to do it?
You can define a minimal pom for each jar and install them into the local repository. There's even a guide for it.
The command (copied and pasted from the guide) is:
mvn install:install-file -Dfile=<path-to-file> -DgroupId=<group-id> \
-DartifactId=<artifact-id> -Dversion=<version> -Dpackaging=<packaging>
Aside from the answer of Aleksi you can also introduce a maven proxy, like Nexus or artifactory.
These tools are accessed by maven (if so configured) to get the artifacts, and they in turn download them when required. With such a tool in place your local maven need only know about a single location, and the Nexus or Artifactory can map a series of internet repositories to a single "virtual" one. You can of course upload your own artifacts too.
If you're developing on your own with a fast internet connection it might be a bit overkill though.
If you're in an enterprise setting I'd recommend Artifactory. Nexus is not always tested all that well with older Maven versions :(