How do you clear Apache Maven s cache

Question

Recently  Apache Maven seems to be having caching issues  Performing clean installs on our projects using Windows Vista or Windows 7 sometimes produce artifacts with the same data as a previous build even though the newer artifact s files should have been updated   Is there any way to clear this cache to force maven to always trigger a clean build of the local artifact that should be built   In particular  we re having issues building a webapp with the war plugin  Maven version is 3 0 3  War plugin version is 2 1 1

User · Answer

Use mvn dependency purge-local-repository -DactTransitively false -Dskip true if you have maven plugins as one of the modules  Otherwise Maven will try to recompile them  thus downloading the dependencies again

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To clean the local cache try using the dependency plug-in    mvn dependency purge-local-repository  This is an attempt to delete the local repository files but it always goes and fills up the local repository after things have been removed  mvn dependency purge-local-repository -DreResolve false   This avoids the re-resolving of the dependencies but seems to still go to the network at times  mvn dependency purge-local-repository -DactTransitively false -DreResolve false  This was added by Pawel Prazak and seems to work well  I d use the third if you want the local repo emptied  and the first if you just want to throw out the local repo and get the dependencies again

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As some answers have pointed out  sometimes you really want to delete the local repository entirely  for example  there might be some artifacts that can t be purged as they are not anymore referenced by the pom   If you want to have this deletion embedded in a maven phase  as for example clean you can use the maven-clean-plugin and access the repository through the settings  for example     lt plugin gt       lt inherited gt false lt  inherited gt       lt groupId gt org apache maven plugins lt  groupId gt       lt artifactId gt maven-antrun-plugin lt  artifactId gt       lt version gt 1 1 lt  version gt       lt executions gt           lt execution gt               lt phase gt clean lt  phase gt               lt goals gt                   lt goal gt run lt  goal gt               lt  goals gt               lt configuration gt                   lt tasks gt                       lt echo gt Base clean is attached to deleting local maven cache lt  echo gt                       lt echo gt   settings localRepository  lt  echo gt                   lt  tasks gt               lt  configuration gt           lt  execution gt       lt  executions gt   lt  plugin gt    lt plugin gt       lt inherited gt false lt  inherited gt       lt artifactId gt maven-clean-plugin lt  artifactId gt       lt version gt 3 1 0 lt  version gt       lt configuration gt           lt filesets gt               lt fileset gt                   lt directory gt   settings localRepository  lt  directory gt               lt  fileset gt           lt  filesets gt       lt  configuration gt   lt  plugin gt

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Have you checked changed the updatePolicy settings for your repositories in your settings xml      This element specifies how often updates should attempt to occur    Maven will compare the local POM s timestamp  stored in a repository s   maven-metadata file  to the remote  The choices are  always  daily    default   interval X  where X is an integer in minutes  or never    Try to set it to always

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I ve had this same problem  and I wrote a one-liner in shell to do it   rm -rf   mvn help evaluate -Dexpression settings localRepository                         -Dorg slf4j simpleLogger defaultLogLevel WARN -B                          -Dorg slf4j simpleLogger log org apache maven cli transfer Slf4jMavenTransferListener warn   grep -vF   INFO        I did it as a one-liner because I wanted to have a Jenkins-project to simply run this whenever I needed  so I wouldn t have to log on to stuff  etc  If you allow yourself a shell-script for it  you can write it cleaner      usr bin env bash REPOSITORY   mvn help evaluate     -Dexpression settings localRepository     -Dorg slf4j simpleLogger defaultLogLevel WARN     -Dorg slf4j simpleLogger log org apache maven cli transfer Slf4jMavenTransferListener warn     --batch-mode       grep -vF   INFO     rm -rf  REPOSITORY     Should work  but I have not tested all of that script   I ve tested the first command  but not the whole script   This approach has the downside of running a large complicated command first  It is idempotent  so you can test it out for yourself  The deletion is its own command afterwards  and this lets you try it all out and check that it does what you think it does  because you shouldn t trust deletion commands without verification  However  it is smart for one good reason  It s portable  It respects your settings xml file  If you re running this command  and tell maven to use a specific xml file  the -s or --settings argument   this will still work  So you don t have to fiddle with making sure everything is the same everywhere   It s a bit wieldy  but it s a decent way of doing business  IMO

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This works on the Spring Tool Suite v 3 1 0 RELEASE  but I m guessing it s also available on Eclipse as well   After deleting the artifacts by hand  as stated by palacsint above  in the  username  m2 directory  re-index the files by doing the following   Go to     Windows- gt Preferences- gt Maven- gt User Settings menu    Click the Reindex button next to the Local Repository text box   Click  Apply  then  OK  and you re done

User · Answer

Delete the artifacts  or the full local repo  from c  Users  lt username gt   m2 repository by hand

User · Answer

I would do the following   mvn dependency purge-local-repository -DactTransitively false -DreResolve false --fail-at-end   The flags tell maven not to try to resolve dependencies or hit the network  Delete what you see locally    And for good measure  ignore errors  --fail-at-end  till the very end   This is sometimes useful for projects that have a somewhat messed up set of dependencies or rely on a somewhat messed up internal repository  it happens

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So there are some commands which you can use for cleaning    1  mvn clean cache     2  mvn clean install   3  mvn clean install -Pclean-database   also deleting repository folder from  m2 can help

[maven] How do you clear Apache Maven's cache?

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