Get source JARs from Maven repository

Question

Does anyone have any idea if you can find source JARs on Maven repositories

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If you know the groupId and aritifactId you can generate download url like this        lt dependency gt           lt groupId gt ch qos logback lt  groupId gt           lt artifactId gt logback-classic lt  artifactId gt           lt version gt 1 2 3 lt  version gt       lt  dependency gt    http   central maven org maven2 ch qos logback logback-classic   and you will get a page like this  chose the version you need just enjoy it

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Based on watching the Maven console in Eclipse  Kepler   sources will be automatically downloaded for a Maven dependency if you attempt to open a class from said Maven dependency  in the editor for which you do not have the sources downloaded already   This is handy when you don t want to grab source for all of your dependencies  but you don t know which ones you want ahead of time  and you re using Eclipse    I ended up using  GabrielRamierez s approach  but will employ  PascalThivent s approach going forward

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In IntelliJ IDEA you can download artifact sources automatically while importing by switching on Automatically download Sources option   Settings    Build  Execution  Deployment   Build Tools   Maven   Importing

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To download any artifact use   mvn dependency get -Dartifact groupId artifactId version packaging classifier   For Groovy sources this would be   mvn dependency get -Dartifact org codehaus groovy groovy-all 2 4 6 jar sources   For Groovy s javadoc you would use  mvn dependency get -Dartifact org codehaus groovy groovy-all 2 4 6 jar javadoc   This puts the given artifact into your local Maven repository  i e  usually  HOME  m2 repository   dependency sources just downloads the project dependencies  sources  not the plugins sources nor the sources of dependencies defined inside plugins

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The maven idea plugin for IntelliJ Idea allows you to specify whether or not sources and java doc should be resolved and downloaded  mvn idea idea -DdownloadSources true -DdownloadJavadocs true

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In Eclipse   Right click on the pom xml Select Run As -  Maven generate-sources it will generate the source by default in  m2 folder   Pre-Requisite   Maven should be configured with Eclipse

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For debugging you can also use a  Java Decompiler  such as  JAD and decompile source on the fly  although the generated source is never the same as the original    Then install JAD as a plugin in Eclipse or your favorite IDE

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NetBeans  Context-Click  In NetBeans 8 with a Maven-driven project  merely context-click on the jar file list item of the dependency in which you are interested  Choose Download Sources  Wait a moment and NetBeans will automatically download and install the source code  if available    Similarly you can choose Download Javadoc to get the doc locally installed  Then you can context-click some code in the editor and choose to see the JavaDoc

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If you want find the source jar file for any of the artifact manually  go to maven repository location for the particular artifact and in Files click on  view All   You can find source jar file

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if you re using eclipse you could also open Preferences   Maven and select Download Artifact Sources  this would let the pom xml intact and keep your sources or java docs  if selected  just for development right at your machine location    m2

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I have also used the eclipse plugin to get the project into the eclipse workspace  Since I ve worked on a different project I saw that it is possible to work with eclipse but without the maven-eclipse-plugin  That makes it easier to use with different environments and enables the easy use of maven over eclipse  And that without changing the pom xml-file   So  I recommend the approach of Gabriel Ramirez

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you can find info in this related question  Get source jar files attached to Eclipse for Maven-managed dependencies  if you use the eclipse maven plugin then use  mvn eclipse eclipse -DdownloadSources true

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Configuring and running the maven-eclipse plugin   for example from the command line mvn eclipse eclipse        lt build gt           lt plugins gt               lt plugin gt                   lt groupId gt org apache maven plugins lt  groupId gt                   lt artifactId gt maven-eclipse-plugin lt  artifactId gt                   lt configuration gt                       lt downloadSources gt true lt  downloadSources gt                       lt downloadJavadocs gt true lt  downloadJavadocs gt                   lt  configuration gt               lt  plugin gt           lt  plugins gt       lt  build gt

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Maven repositories do provide simple way to download sources jar    I will explain it using a demonstration for  spring-boot-actuator-autoconfigure     Go to maven repository - https   mvnrepository com artifact org springframework boot spring-boot-actuator-autoconfigure The page lists various versions  Click-on to desired one  let s say  2 1 6 RELEASE - https   mvnrepository com artifact org springframework boot spring-boot-actuator-autoconfigure 2 1 6 RELEASE The page have link  View All  next to  Files   Click it - https   repo1 maven org maven2 org springframework boot spring-boot-actuator-autoconfigure 2 1 6 RELEASE  The page lists various files including the one for sources -  https   repo1 maven org maven2 org springframework boot spring-boot-actuator-autoconfigure 2 1 6 RELEASE spring-boot-actuator-autoconfigure-2 1 6 RELEASE-sources jar   Otherwise  you can always  git clone  the repo from github  if its there and get the specific code   As explained by others  you can use  mvn dependency sources  command the get and generate sources jar for the dependency you are using   Note  Some dependencies will not have sources jar  as those contains no source code but a pom file  e g  spring-boot-starter-actuator   As in this case      Starter POMs are a set of convenient dependency descriptors that you can include in your application  You get a one-stop-shop for all the Spring and related technology that you need  without having to hunt through sample code and copy paste loads of dependency descriptors    Reference  Intro to Spring Boot Starters

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Maven Micro-Tip  Get sources and Javadocs      When you re using Maven in an IDE you often find the need for your IDE to resolve source code and Javadocs for your library dependencies   There s an easy way to accomplish that goal   mvn dependency sources mvn dependency resolve -Dclassifier javadoc      The first command will attempt to download source code for each of the dependencies in your pom file       The second command will attempt to download the Javadocs       Maven is at the mercy of the library packagers here   So some of them won t have source code packaged and many of them won t have Javadocs       In case you have a lot of dependencies it might also be a good idea to use   inclusions exclusions to get specific artifacts  the following command   will for example only download the sources for the dependency with   a specific artifactId   mvn dependency sources -DincludeArtifactIds guava   Source  http   tedwise com 2010 01 27 maven-micro-tip-get-sources-and-javadocs   Documentation  https   maven apache org plugins maven-dependency-plugin sources-mojo html

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In eclipse - click on the project then

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You can  if they are uploaded  Generally they are called  frameworkname-version-source s

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To download some specific source or javadoc we need to include the GroupIds - Its a comma separated value as shown below  mvn dependency sources -DincludeGroupIds com jcraft org testng -Dclassifier sources   Note that the classifier are not comma separated  to download the javadoc we need to run the above command one more time with the classifier as javadoc  mvn dependency sources -DincludeGroupIds com jcraft org testng -Dclassifier javadoc

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If a project creates a jar of the project sources and deploys it to a maven repository  then you ll find it     Just FYI  sources artifacts are generally created by the maven-source-plugin  This plugin can bundle the main or test sources of a project into a jar archive and  as explained in Configuring Source Plugin            The generated jar file will be named by the value of the finalName plus  -sources  if it is the main sources  Otherwise  it would be finalName plus  -test-sources  if it is the test sources    The additional text was given to describe an artifact   -sources  or  -test-sources  here  is called a classifier    To declare a dependency on an artifact that uses a classifier  simply add the  lt classifier gt  element  For example    lt dependency gt     lt groupId gt org hibernate lt  groupId gt     lt artifactId gt hibernate lt  artifactId gt     lt version gt 3 2 7 ga lt  version gt     lt classifier gt sources lt  classifier gt   lt  dependency gt    Note that you generally don t do this  most IDEs provide support to download sources  and or JavaDoc  from the main artifact without declaring explicitly a dependency on them   Finally  also note that some repository search engines allow searching for artifacts using the classifier  at least Nexus does with the advanced search   See this search for example

[java] Get source JARs from Maven repository

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