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When I define an updatePolicy in my maven settings it tells maven how often snapshot artifacts shall be downloaded.
If I set it to always it of course downloads every time all snapshots.
I was wondering what happens if I set it to the default value daily or another longer peroid.
Does maven still check whether a new version of the snapshot is available and if so, does it download it although the policy says daily ?
I'm looking for the correct settings to avoid redundant downloads and not to miss a newer snapshot out there.
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updatePolicy: 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 .
Maven follows the repository's updatePolicy , which tells it how often (if ever) maven checks if a dependency has been updated (in the case of SNAPSHOT), or has become available, in the case of a released version.
SNAPSHOT is a special version that indicates a current development copy. Unlike regular versions, Maven checks for a new SNAPSHOT version in a remote repository for every build.
A Maven settings. xml file defines values that configure Maven execution in various ways. Most commonly, it is used to define a local repository location, alternate remote repository servers, and authentication information for private repositories.
I was wondering what happens if I set it to the default value daily or another longer period.
The Repository - SNAPSHOT Handling explains it maybe better than the POM reference:
Each repository in the project has its own update policy:
- always - always check when Maven is started for newer versions of snapshots
- never - never check for newer remote versions. Once off manual updates can be performed.
- daily (default) - check on the first run of the day (local time)
- interval:XXX - check every XXX minutes
I don't think there is anything to add (except maybe that check != download).
Does maven still check whether a new version of the snapshot is available and if so, does it download it although the policy says daily ?
Well, no, why would it?
I'm looking for the correct settings to avoid redundant downloads and not to miss a newer snapshot out there.
Use always if you always want Maven to download a newer version of snapshots, if available (Maven will always check the remote repository but only download if the version is newer).
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