I've noticed something really cool about the m2eclipse plugin. When I try to view source on one of the class files included by Maven, at first it's unable to show it to me, but then in the background, it downloads a src JAR and a docs JAR. For my own projects how do I make and deploy these JARs alongside my binary JAR in my Maven repository?
You can do this by attaching the source and javadocs as part of your project build. This cookbook has the maven configuration needed for it.
Maven Source Plugin: http://maven.apache.org/plugins/maven-source-plugin/usage.html
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I a maven rookie and am wondering how to get a binary jar file if it is not already in the repo. Specifically i'm in need of: jackson-dataformats-text-2.13.0.jar. Do I need to build it myself? I'm used to creating a project and marking a library as a dependency and seeing the jar downloaded into my .m2 cache but all i see in my cache is:
jchan#jchan-Z170N:~/.m2/repository/com/fasterxml/jackson/dataformat/jackson-dataformats-text/2.13.0$ ls
jackson-dataformats-text-2.13.0.jar.lastUpdated jackson-dataformats-text-2.13.0.pom.sha1
jackson-dataformats-text-2.13.0.pom _remote.repositories
Can someone advise how I am to get a built version of the jar from maven central?
We are still maintaining our ant build and I need the jar file for this. (i know i know, ancient stuff but team is not ready to port just yet).
parent pom don't contain jar file
This is the reason why no bundle link is present on the official public maven repository https://mvnrepository.com
The maven dependency is not a jar, is a parent. So the extension is: .pom which is just a plain pom.xml
Parent dependencies don't contain compiled class like .jar.
In your specific case, there are another dependencies who contains jars:
https://repo1.maven.org/maven2/com/fasterxml/jackson/dataformat/jackson-dataformat-yaml/2.13.0/
https://repo1.maven.org/maven2/com/fasterxml/jackson/dataformat/jackson-dataformat-xml/2.13.0/
advice
Check what classes do you need on your ant project and search if exist a jar (with the classes you need) on https://mvnrepository.com
Another option is to get all the dependencies from pom :
https://repo1.maven.org/maven2/com/fasterxml/jackson/dataformat/jackson-dataformats-text/2.9.0/jackson-dataformats-text-2.9.0.pom and download them into your ant project. In theory is the same of add the parent pom in a maven project
I am using one Apache open source project and its pre-built binary contains all the target jars and the corresponding dependency jars for deployment.
But when I build from source like mvn clean install, how could I also get the necessary dependency jars for deployment?
I suggest two options:
Build a fat jar: the maven output jar will contain ll necessary classes taken from its dependencies. To accomplish this task you can use the maven-assembly-plugin maven plugin. You can read a good tutorial here.
Configure maven to copy all needed jar in a specific folder. To accomplish this task you can use the maven-dependency-plugin maven plugin. You will find a good tutorial here.
If I add a JAR file to a gradle project's depenencies, the code compiles just fine, but after publishing to maven (publishToMavenLocal), the classes from the JAR are not found.
Obviously, this is because the jar is added as a "dependency" and not part of the project itself. Is there a way to get the contents of the JAR file to merge into the library? Do I need to make a separate maven repo for each JAR?
You can always try to create a fat jar which includes dependencies. You can follow the instructions provided here https://www.baeldung.com/gradle-fat-jar
I am trying to install some dependencies using maven in a spring boot project.
I am looking for a jar
org.apache.maven.plugins:maven-resources-plugin:jar:3.1.0
But I wanna know if the jar file should have this name maven-resources-plugin, or if the file name is not important for maven. I mean if maven will automatically know which jar file should use.
I will appreciate any help or feedback.
That is a plugin, not a dependency as such (meaning that Maven needs it for building your project, your code doesn't need it to compile or run).
You should only have to specify the plugins groupId, artifactId and version plus any configuration in your pom.xml, and Maven knows exactly what jar to get and how to use it.
See https://maven.apache.org/plugins/maven-resources-plugin/plugin-info.html for further information.
In one Java project, I have configured its POM so maven will generate in the target folder:
the binaries jar.
the sources jar.
the javadocs jar.
the tests jar.
In addition, I configured the POM so Maven downloads all the project dependencies in the target/lib folder.
The project is also uploaded to the Sonatype snapshots repository.
My question is: Is it possible for a user of my library to download all the artefacts mentioned above with one single instruction, without having to checkout the sources of my project first ?
I found in a question from some years ago that just distributing the POM is not enough to download a project and its dependencies.
But I have not lost hope that this could be possible to accomplish in one single step.
When you say "all of the artifacts mentioned above", do you mean:
the binaries jar.
the sources jar.
the javadocs jar.
the tests jar.
or do you mean:
all the project dependencies
Assuming the latter, then have your user do the following:
create a dummy pom.xml file
declare your library as a dependency
use maven-dependency-plugin:copy-dependencies to copy jars into desired location
Hope that helps.