Maven and Spring Boot - non resolvable parent pom - repo spring io Unknown host

Question

I am trying to build my project but I get this   Non-resolvable parent POM  Could not transfer artifact org springframework boot spring-boot-starter-parent pom 1 3 0 M3 from to spring-snapshots  http   repo spring io snapshot   repo spring io and  parent relativePath  points at no local POM   line 16  column 10  Unknown host repo spring io - gt   Help 2   Here is how I specify the parent of my pom xml   lt parent gt       lt groupId gt org springframework boot lt  groupId gt       lt artifactId gt spring-boot-starter-parent lt  artifactId gt       lt version gt 1 3 0 M3 lt  version gt       lt relativePath gt  lt  relativePath gt   lt  parent gt   The  is empty so that it forces maven to look for the parent in the remote repository  However  it says that repo spring io is an unknown host  Here is how I define the repositories in my pom xml   lt repositories gt       lt repository gt           lt id gt spring-snapshots lt  id gt           lt url gt http   repo spring io snapshot lt  url gt           lt snapshots gt               lt enabled gt true lt  enabled gt           lt  snapshots gt       lt  repository gt       lt repository gt           lt id gt spring-milestones lt  id gt           lt url gt http   repo spring io milestone lt  url gt       lt  repository gt   lt  repositories gt    lt pluginRepositories gt       lt pluginRepository gt           lt id gt spring-snapshots lt  id gt           lt url gt http   repo spring io snapshot lt  url gt       lt  pluginRepository gt       lt pluginRepository gt           lt id gt spring-milestones lt  id gt           lt url gt http   repo spring io milestone lt  url gt       lt  pluginRepository gt   lt  pluginRepositories gt   Any ideas

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If you are using docker service and you have switched to other network  You need to restart docker service    service docker restart  This solved my problem in docker

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Rigth button on your project -  Maven -  Update

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Project- maven- Update Project- tick all checkboxes expect offline and error is solved soon

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The issue is with your project which is not able to complete maven build  Steps to follow     Right Click Application and RunAs maven install  If you get any error while reaching the repos online try giving the proxies in settings xml under your  m2 directory Check this link for setting proxies for maven build  Once done   try doing a Update Project by Right Click Project   Maven- Update Maven Project and select codebase and do check the Force Update of Snapshot Release check box    This will update your maven build and will surely remove your errors with pom xml

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Just a remind  I tried to work with idea and imported maven  and encountered the same problem  I have tried all the solutions and they didnt work  Finally  I found out it was because of the root access    I opened idea with administrator access and all things work just fine  hope you not as silly as i am

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As people already mentioned  it could be internet problems or proxy configuration  I found this question when I was searching about the same problem  In my case  it was proxy configuration Answers posted here didn t solve my issue  because every link suggest a configuration that shows the username and passoword and I can t use it  I was searching about it elsewere and I found a configuration to be made on settings xml  I needed to make some changes  Here is the final code    lt profiles gt       lt profile gt          lt id gt MavenRepository lt  id gt              lt repositories gt               lt repository gt                   lt id gt central lt  id gt                   lt url gt https   repo1 maven org maven2 lt  url gt                   lt snapshots gt                       lt enabled gt false lt  enabled gt                   lt  snapshots gt                   lt releases gt                       lt enabled gt true lt  enabled gt                   lt  releases gt               lt  repository gt           lt  repositories gt       lt  profile gt   lt  profiles gt    lt activeProfiles gt       lt activeProfile gt MavenRepository lt  activeProfile gt   lt  activeProfiles gt    I hope be useful

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If all above stuffs not works  try this  If you are using IntelliJ  Check below setting   May be    m2 settings xml is restricting to connect to internet

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If you re using docker-machine  docker on Windows or OSX    Currently docker-machine has a bug that it loses internet connection if you switch between wifi networks or wifi and cable   Make sure you restart your docker-machine   usually  docker-machine restart default

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Obviously it s a problem with your internet connection  Check  if you can reach http   repo spring io with your browser  If yes  check if you need to configure a proxy server  If no  you should contact your internet provider   Here is the documentation  how you configure a proxy server for Maven  https   maven apache org guides mini guide-proxies html

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In the pom xml  after loading effective pom xml in eclipse   you may see it  http   repo maven apache org maven2  under central repository instead of  https   repo maven apache org maven2   Fix it

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In my case the problem was with the java version mismatch of pom xml  java 1 8  and environment variables JAVA HOME JDK HOME  java 1 7   After pointing environment variables JAVA HOME  amp  JDK HOME to Java 1 8  the issue got resolved

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Downgrade your version   lt parent gt           lt groupId gt org springframework boot lt  groupId gt           lt artifactId gt spring-boot-starter-parent lt  artifactId gt           lt version gt  lt change this version gt  lt  version gt           lt relativePath   gt   lt  -- lookup parent from repository -- gt       lt  parent gt    Build and undo the version  Build  2 1 6 RELEASE to 1 3 3 RELEASE Build Undo 1 3 3 to 2 1 6 Build  in my case problem solved  It helped us

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For anyone stumbling upon this question  I ll post the solution to a similar problem  same error message except for the uknown host part    Since January 15  2020 maven central no longer supports HTTP  in favour of HTTPS  Consequently  spring repositories switched to HTTPS as well  The solution is therefore to change the urls from http   repo spring io milestone to https   repo spring io milestone

[spring] Maven and Spring Boot - non resolvable parent pom - repo.spring.io (Unknown host)

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