How to simply download a JAR using Maven? - maven

How do I download JAR during a build in Maven script?

Maven does not work like that. Here's the closest you'll get to my knowledge:
mvn dependency:get -DremoteRepositories=http://repo1.maven.org/maven2/ \
-DgroupId=junit -DartifactId=junit -Dversion=4.8.2 \
-Dtransitive=false
Note that all parameters except transitive are required.
Also note that Maven will download the jar to your local repository, and there's no sensible way (that I know of) to copy it to a local directory.
Reference:
dependency:get

Or since 3.1, simply as
mvn dependency:get -Dartifact=org.springframework:spring-instrument:3.2.3.RELEASE

Note: This answer is for downloading the jars directly from maven without any scripts [That is how Google directed me here]
Assuming mvn dependency is like this:
<dependency>
<groupId>com.zaxxer</groupId>
<artifactId>HikariCP</artifactId>
<version>2.4.7</version>
</dependency>
Goto http://search.maven.org and search for g:"com.zaxxer" AND a:"HikariCP" AND v:"2.4.7" (simply searching for HikariCP also works. You may need to select the appropriate GroupId and Version from the results)
In the Search Results -> Download column, you should see jar javadoc.jar sources.jar available for direct download

You can use:
mvn dependency:copy -Dartifact=<group>:<artifact-name>:<version> -DoutputDirectory=/tmp/my_custom_dir
(Replace <values> with the ones of your case)
That's the full documentation of the goal: https://maven.apache.org/plugins/maven-dependency-plugin/copy-mojo.html
Note: the other "dependecy:get" way of doing this has been deprecated.

You can download Jar package to specific directory.
mvn dependency:get -Dartifact=org.riversun:random-forest-codegen:1.0.0 -Ddest=./

See How to use Maven pom to download jar files only. This worked really nicely for me.
My use case was that I wanted to download some of the dependency jars to deploy to a QA server, and was doing it manually (outside of the Maven build). I'm not sure exactly what your use case is.

This is what I do (2022 answer), go to https://mvnrepository.com/, search for your .jar and click on here:

Normally you don't use Maven for "just downloading", but for your build process. So normally, you do the following steps:
Define a new project by defining the archetype of your project and some needed properties.
Define as a dependency the library you want to use.
Run Maven with mvn compile
As a side effect, you will have downloaded the library to your local Maven repository. There are a lot of plugins to do something with dependencies, so have e.g. a look at the Maven Dependency plugin.

If you just want to download a JAR once from a maven mirror I suggest you could just do this manually:
For Maven 1:
http://mirrors.ibiblio.org/pub/mirrors/maven/
For Maven 2:
http://mirrors.ibiblio.org/pub/mirrors/maven2/
These are the repositories (a mirror anyway) that maven will get its JARs from - you can easily access them in the webbrowser of your choice and download the JARs etc. Just browse through the hierarchy (it looks like any Java packag hierarchy) until you find the artefact, then pick the right version and you're good.
For example version 3.6.6.Final of hibernate-core from group org.hibernate you'd find here:
http://mirrors.ibiblio.org/pub/mirrors/maven2/org/hibernate/hibernate-core/3.6.6.Final/

You can setup a pom.xml to define your dependencies (the jars you want to copy). Then use the dependency:copy-dependencies goal to copy the jars to the desired location.

It's possible to download a JAR from a Gitlab Maven private repository. The URL is appearing when running some Maven command so it's a bit hacky but it's working for me.
Like this:
wget --header "PRIVATE-TOKEN: ${GITLAB_PRIVATE_TOKEN}" "https://gitlab.com/api/v4/projects/${GITLAB_PROJECT_ID}/packages/maven/${MAVEN_PACKAGE_NAME}/${MAVEN_VERSION}/${JAR_FILE}"
Where,
GITLAB_PRIVATE_TOKEN is a Gitlab Token with right "api" (atm the others are not enough)
GITLAB_PROJECT_ID e.g. 1462237
MAVEN_PACKAGE_NAME e.g. com/bar/foo
MAVEN_VERSION e.g. 0.0.1
JAR_FILE e.g. foo-0.0.1.jar

Updated 2022 answer for command line - building on Ivan Carcamo's answer:
wget [the link that Ivan Carcamo points to in his screenshot]
Edit: This may download the thin jar for some repositories, so you may need to find a different link for the fat jar

Use the below code snip
result = subprocess.check_output('mvn org.apache.maven.plugins:maven-dependency-plugin:2.8:get \
-DgroupId=%s \
-DartifactId=%s \
-Dversion=%s \
-Dtransitive=false \
-DremoteRepositories={repos_string} \
-Dpackaging=jar \
-DoutputDirectory=%s' % (group_id,
artifact_id,
version_name,
des_path), shell=True)
logger.info("success download jar: %s" % each_version)
except Exception as e:
logger.error("Error in download jar : %s" % str(e))

All the jars are available directly in the maven central repository. You don't have to use "maven" if all you want is the jar.
https://repo.maven.apache.org/maven2/
If the pom dependency is
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>5.2.2</version>
</dependency>
You can download it from the corresponding directory structure by replacing the dots with forward slashses on the group id, artifact id, and version. I would navigate to the final folder to get the exact link of the jar.
https://repo.maven.apache.org/maven2/org/apache/poi/poi/5.2.2/poi-5.2.2.jar

As of December 12, 2022 the easiest way to download all dependencies including the jar file itself is to go to this link:
https://jar-download.com/online-maven-download-tool.php
And simply paste the Maven XML to the page and click download. God bless the person who built jar-download.com. :-)

This works for me, but it downloads only the latest version:
#! /bin/bash
set -eu
if [[ -z ${1:-} || -z ${2:-} ]]; then
printf 'Usage: %s group artifact\n' "$(basename "$0")" >&2
exit 1
fi
g="$1"
a="$2"
url='https://search.maven.org'
v="$(curl -s "$url/solrsearch/select?q=g:$g+AND+a:$a&core=gav&rows=20&wt=json" |
jq -r '.response.docs[0].v')"
curl -s -L -o "$a-$v.jar" "$url/remotecontent?filepath=${g//.//}/$a/$v/$a-$v.jar"
You need bash, curl and jq.
Example:
./maven-download net.sf.saxon Saxon-HE
Downloads Saxon-HE-11.4.jar today (2022-12-23).

Related

Download a binary with Maven dependency plug-in

I want to write a simple shell script that uses Maven to download the last version of the .zip deployed at this location:
https://github.com/EBIBioSamples/EBIBioSamples.github.io/tree/maven-repo/uk/ac/ebi/fg/myequivalents-rdf/1.1-SNAPSHOT
(that is the file myequivalents-rdf-1.1-20161007.151102-1.zip as of today).
I'm trying to use dependency:copy this way:
mvn dependency:copy \
-DremoteRepositories=https://raw.githubusercontent.com/EBIBioSamples/EBIBioSamples.github.io/maven-repo \
-DgroupId=uk.ac.ebi.fg -DartifactId=myequivalents-rdf -Dversion=1.1-SNAPSHOT -Dartifact=zip \
-Dtransitive=false -DoutputDirectory=/tmp
But it keeps saying "Either artifact or artifactItems is required". I've tried artifact=jar (just to see if it download the .jar instead) and -DartifactItems in place of artifact, but no luck. So, is this possible with Maven? How? The reason I want to use Maven is that it should be faster/cleaner than downloading maven-metadata.xml, extracting the timestamp and using it to build the final URL.

Errors with Maven install on a project

I'm trying to install Maven on a project (with mvn clean install) but I have some errors and I don't know what they mean.
Here is the screen shot of the cmd :
I also add the right environment variables for maven (M2, M2_HOME and MAVEN_OPTS).
Can someone help me and tell me what it means please ?
It means that your dependency to eu.akka.jbossas:jboss-as-client:7.1.7.Final that you have specified in your POM is not available at Maven central. Do you have the jar file available somewhere?
If that is the case, run this:
mvn install:install-file -Dfile=<your jar file> -DgroupId=eu.akka.jbossas -DartifactId=jboss-as-client -Dversion=7.1.7.Final -Dpackaging=jar
Please bear in mind that this means that only the machine you are running on will be able to build your project. If other developers/machines also need to build this project, consider installing a central repository at your site, such as Nexus or Artifactory, and upload the jar file there. You will then also need to make Maven aware that it should fetch the dependencies from there.
The error tells you that the maven dependency eu.akka.jbossas:jboss-as-client doesn't exist. I've checked the url where it should be and it doesn't exist.
You should check other dependencies. For example the one maven provides:
<dependency>
<groupId>org.jboss.as</groupId>
<artifactId>jboss-as-appclient</artifactId>
<version>7.1.1.Final</version>
</dependency>
If you've got the jar local, you can create a maven-dependency by using this guide.

Run tomcat project without pom.xml (like yum or apt-get)

For a presentation purpose and installation handbook i like to run a tomcat-project directly with only maven installed.
I googled around an found:
a way to download the dependency directly my mvn dependency:get
a way to start the war by mvn tomcat7:run
Is there any way to have a short shell-command who download the dependency from the server, compile and start it?
Actually i got this:
mvn dependency:get tomcat7:run
-DgroupId=XXXXX
-DartifactId=hasty-tumbleweed
-Dversion=0.9.2-SNAPSHOT
-DrepoUrl=file://C:/Users/woodcraft.xenther-vladic/.m2/repository
But mvn still try to find the plugin from the official maven repository.
Any Idea?
Are you maybe missing this:
Caveat: will always check the central repository defined in the super pom
From the little information here, you make it look as if you're distributing files already (the repository stuff) so why not provide a POM as well, opening you up to doing whatever nifty Maven stuff you desire. Then you can do:
mvn install -f <path to your POM>

mvn clean install, mvn install:install-file order?

I am learning maven and trying to understand the order of things. As I understand, mvn clean install builds the repository with the default jars, where install produces a .zip that I will need later.
I want to use my custom jars which I call mvn install:install-file, but when I run this before install, I get some cannot find symbol errors. I am assuming my custom jars (which don't contain these classes) overwrites some default jars? I can't find these classes anywhere on my filesystem, so I am assuming they are already packaged in 1 of the default jars. How can I get around this?
Also, which order should I do things? All I want is the final .zip, that includes the custom jars?
mvn install -- builds and packages the source code and copies ( installs ) the artifact to your local repository which is $USER_HOME/.m2/repository
It's hard to say what's happening there without looking at the command you typed in, and the error trace that you received. That said, install-file is to copy an artifact to your local repo at appropriate hierarchy. It's nothing more than that. The correct syntax would be:
mvn install:install-file -Dfile=<path-to-file> -DgroupId=<group-id> \
-DartifactId=<artifact-id> -Dversion=<version> -Dpackaging=<packaging>
Usually, you just need to run install:install-file for all the custom dependencies once, and before you execute the mvn install.
If your custom jars have same coordinates -- artifactid, groupid, and version as some of the dependencies in your pom.xml and your custom jars do not have the classed that your source code uses -- well, you get the error.
refer: http://maven.apache.org/guides/mini/guide-3rd-party-jars-local.html
Regarding to the maven-install-plugin website they mention as the following: -
install:install-file: is mostly used to install an externally created artifact into the local repository, along with its POM. In that case the project information can be taken from an optionally specified pomFile, but can also be given using command line parameters.
This means the artifact should be created before using this command. If you would like to deploy your fresh compiled code to the local repository, please just use the mvn clean install.
Please look at the Introduction to the Build Lifecycle for further information about the sequence and lifecycle. I hope this may help.
Regards,
Charlee Ch.

Where can I find a repository containing functionaljava 3.0?

I would like to use functional Java 3.0 in a maven project. I have been googling a little, but I can't find valid information to include the corresponsding 'dependency' in my pom.xml.
Someone mentioned that he would upload the artifacts to the scala-tools maven repository, but it does not seem like he followed-up on his announcement.
It does not even seem that earlier versions of functional Java are available from maven.
Does anyone have valid and recent information about this issue?
Thanks!
P.S.: Yes, I know I can download and manually include the .jar in my project, but this is only a workaround solution...
Version 3.0 is now in Maven Central: http://repo1.maven.org/maven2/org/functionaljava/functionaljava/3.0/
There doesn't seem to be any maven distribution. But here's a small shell script that will install the jar and the sources in your local repo.
Unpack the zip distribution and execute this script from inside the unpacked directory:
#!/bin/bash
# edit these to suit your needs
GROUPID=org.functionaljava
ARTIFACTID=fj
VERSION=3.0
mvn install:install-file -DgroupId=$GROUPID -DartifactId=$ARTIFACTID \
-Dversion=$VERSION -Dpackaging=jar -Dfile=functionaljava.jar
cd src/main
jar cf src.jar *
mvn install:install-file -DgroupId=$GROUPID -DartifactId=$ARTIFACTID \
-Dversion=$VERSION -Dpackaging=jar -Dclassifier=sources -Dfile=src.jar
rm src.jar
(Windows version would be very similar, probably just replace $this with %this%, maybe prepend CALL to the maven calls)
Fact is, I don't like to manually include .jars in repositories, because it is not a distributed solution.
I have copied the functional java code in a maven 'repository' project called 'externals' and it compiles fine. I can generate the artifacts and have no need to upload them manually anymore.

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