How do I configure Maven for offline development

Question

Does maven require a connection to the internet at some point to be able to use it  Meaning specifically getting the internal maven plugins for compiling  cleaning  packaging  etc

User · Answer

My experience shows that the -o option doesn't work properly and that the go-offline goal is far from sufficient to allow a full offline build:

The solution I could validate includes the use of the --legacy-local-repository maven option rather than the -o (offline) one and the use of the local repository in place of the distribution repository

In addition, I had to copy every maven-metadata-maven2_central.xml files of the local-repo into the maven-metadata.xml form expected by maven.

See the solution I found here.

User · Answer

source  jfrog com     or    Just use Maven repository servers like Sonatype Nexus http   www sonatype org nexus  or JFrog Artifactory https   www jfrog com artifactory    After one developer builds a project  build by next developers or Jenkins CI will not require Internet access   Maven repository server also can have proxies configured to access Maven Central  or more needed public repositories   and they can have cynch ed list of artifacts in remote repositories

User · Answer

lt offline gt  false  lt  offline gt    lt localRepository gt   user home   m2 repository lt  localRepository gt    to    lt offline gt  true  lt offline gt    lt localRepository gt   user home   m2 repository lt  localRepository gt    Change the offline tag from false to true    will download from repo online

User · Answer

Does this work for you   http   jojovedder blogspot com 2009 04 running-maven-offline-using-local html  Don t forget to add it to your plugin repository and point the url to wherever your repository is    lt repositories gt       lt repository gt           lt id gt local lt  id gt           lt url gt file   D  mavenrepo lt  url gt       lt  repository gt   lt  repositories gt   lt pluginRepositories gt       lt pluginRepository gt           lt id gt local lt  id gt           lt url gt file   D  mavenrepo lt  url gt       lt  pluginRepository gt   lt  pluginRepositories gt    If not  you may need to run a local server  e g  apache  on your machines

User · Answer

You can run maven in offline mode mvn -o install  Of course any artifacts not available in your local repository will fail  Maven is not predicated on distributed repositories  but they certainly make things more seamless  Its for this reason that many shops use internal mirrors that are incrementally synced with the central repos    In addition  the mvn dependency go-offline can be used to ensure you have all of your dependencies installed locally before you begin to work offline

User · Answer

In preparation before working offline just run mvn dependency go-offline

User · Answer

Answering your question directly  it does not require an internet connection  but access to a repository  on LAN or local disk  use hints from other people who posted here    If your project is not in a mature phase  that means when POMs are changed quite often  offline mode will be very impractical  as you ll have to update your repository quite often  too  Unless you can get a copy of a repository that has everything you need  but how would you know  Usually you start a repository from scratch and it gets cloned gradually during development  on a computer connected to another repository   A copy of the repo1 maven org public repository weighs hundreds of gigabytes  so I wouldn t recommend brute force  either

User · Answer

A new plugin has appeared to fix shortcomings of mvn dependency go-offline   https   github com qaware go-offline-maven-plugin  Add it in your pom  then run mvn -T1C de qaware maven go-offline-maven-plugin resolve-dependencies  Once you ve setup all dynamic dependencies  maven won t try to download anything again  until you update versions

User · Answer

Before going offline you have to make sure that everything is in your local repo  which is required while working offline  Running  mvn dependency go-offline  for the project s  pom s   you intend to work on  will reduce the efforts to achieve this    But it  s usually not the whole story  because dependency go-offline will only download the  bare build  plugins  go-offline   resolve-plugins does not resolve all plugin dependencies   So you have to find a way to download deploy   test   site plugins  and maybe others  and their dependencies into your repo   Furthermore dependency go-offline does not download the pom  s artifact itself  so you have to dependency copy it if required   Sometimes - as MaDa wrote - you do not know  what you will need  while being offline  which makes it pretty impossible to have a  sufficient  repo   Anyway having a properly filled repo you only have to add   lt offline gt true lt  offline gt   to Maven  s settings xml to go offline   Do not change the Maven profile  id  you used to fill your repo  while being offline  Maven recognizes the downloaded artifacts in its metadata with an  identity   which is bound to the profile id

User · Answer

You have two options for this   1   make changes in the settings xml add this in first tag    lt localRepository gt C  Users admin  m2 repository lt  localRepository gt    2   use the -o tag for offline command   mvn -o clean install -DskipTests true mvn -o jetty run

User · Answer

Sadly dependency go-offline hasn t worked for me as it didn t cached   everything  ie  POMs files and other implicitly mention dependencies    The workaround has been to specify a local repository location  either within settings xml file with  lt localRepository gt     lt  localRepository gt  or by running mvn with -Dmaven repo local     parameter   After initial project build  all necessary artifacts should be cached  and then you can reference repository location the same ways  while running Maven build in offline mode  mvn -o

User · Answer

If you re using IntelliJ  you can simply go to Preferences -  Build  Execution  Deployment -  Build Tools -  Maven and check uncheck Work offline

User · Answer

If you have a PC with internet access in your LAN  you should install a local Maven repository  I recommend Artifactory Open Source  This is what we use in our organization  it is really easy to setup   Artifactory acts as a proxy between your build tool  Maven  Ant  Ivy  Gradle etc   and the outside world  It caches remote artifacts so that you don   t have to download them over and over again  It blocks unwanted  and sometimes security-sensitive  external requests for internal artifacts and controls how and where artifacts are deployed  and by whom   After setting up Artifactory you just need to change Maven s settings xml in the development machines   lt  xml version  quot 1 0 quot  encoding  quot UTF-8 quot   gt   lt settings xsi schemaLocation  quot http   maven apache org SETTINGS 1 0 0 http   maven apache org xsd settings-1 0 0 xsd quot  xmlns  quot http   maven apache org SETTINGS 1 0 0 quot      xmlns xsi  quot http   www w3 org 2001 XMLSchema-instance quot  gt     lt mirrors gt       lt mirror gt         lt mirrorOf gt   lt  mirrorOf gt         lt name gt repo lt  name gt         lt url gt http   maven yourorganization com 8081 artifactory repo lt  url gt         lt id gt repo lt  id gt       lt  mirror gt     lt  mirrors gt     lt profiles gt       lt profile gt         lt repositories gt           lt repository gt             lt snapshots gt               lt enabled gt false lt  enabled gt             lt  snapshots gt             lt id gt central lt  id gt             lt name gt libs-release lt  name gt             lt url gt http   maven yourorganization com 8081 artifactory libs-release lt  url gt           lt  repository gt           lt repository gt             lt snapshots   gt             lt id gt snapshots lt  id gt             lt name gt libs-snapshot lt  name gt             lt url gt http   maven yourorganization com 8081 artifactory libs-snapshot lt  url gt           lt  repository gt         lt  repositories gt         lt pluginRepositories gt           lt pluginRepository gt             lt snapshots gt               lt enabled gt false lt  enabled gt             lt  snapshots gt             lt id gt central lt  id gt             lt name gt plugins-release lt  name gt             lt url gt http   maven yourorganization com 8081 artifactory plugins-release lt  url gt           lt  pluginRepository gt           lt pluginRepository gt             lt snapshots   gt             lt id gt snapshots lt  id gt             lt name gt plugins-snapshot lt  name gt             lt url gt http   maven yourorganization com 8081 artifactory plugins-snapshot lt  url gt           lt  pluginRepository gt         lt  pluginRepositories gt         lt id gt artifactory lt  id gt       lt  profile gt     lt  profiles gt     lt activeProfiles gt       lt activeProfile gt artifactory lt  activeProfile gt     lt  activeProfiles gt   lt  settings gt   We used this solution because we had problems with internet access in our development machines and some artifacts downloaded corrupted files or didn t download at all  We haven t had problems since

User · Answer

Maven needs the dependencies in your local repository  The easiest way to get them is with internet access  or harder using other solutions provided here    So assumed that you can get temporarily internet access you can prepare to go offline using the maven-dependency-plugin with its dependency go-offline goal  This will download all your project dependencies to your local repository  of course changes in the dependencies   plugins will require new internet   central repository access

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