Maven全新安装奇怪的下载

Question

I have been using maven for a while, since a couple of weeks I started to notice some downloads every time I execute "clean install".

[INFO] Downloading: https://repo1.maven.org/maven2/org/apache/qpid/proton-jms/0.3.0-fuse-2/proton-jms-0.3.0-fuse-2.pom
[INFO] Downloading: https://code.lds.org/nexus/content/groups/main-repo/org/apache/qpid/proton-jms/0.3.0-fuse-2/proton-jms-0.3.0-fuse-2.pom
[INFO] Downloading: http://repo.spring.io/release/org/apache/qpid/proton-jms/0.3.0-fuse-2/proton-jms-0.3.0-fuse-2.pom
[INFO] Downloading: http://repo.spring.io/release/org/apache/qpid/proton/0.3.0-fuse-2/proton-0.3.0-fuse-2.pom
[INFO] Downloading: http://repo.spring.io/release/org/apache/qpid/proton-api/0.3.0-fuse-2/proton-api-0.3.0-fuse-2.pom

I'm guessing that someone add a new dependency into the POM file (maybe spring) but still, it should download just one time right? it is downloading every time for me,

Any suggestions to get rid of this ?

Answer 1

Its not actually download all the dependency from the Internet. If first time issued a mvn command the dependencies mentioned in pom.xml are downloaded from Internet and are saved in your local M2_HOME or local repository. Then if you don't remove these dependencies from the M2_HOME or local repository every next mvn command get/fetch these dependencies from the M2_HOME or local repository.

Maven also display this getting/fetching of jar file as download. You may notice the the later download takes much less time than the first download. Because the later mvn command download/get/fetch these dependencies from he local repository.