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From Geißler, Daniel <>
Subject ivy cache, changing patterns and time to live
Date Wed, 31 Jan 2018 21:03:02 GMT

we are investigating some serious pain with our build times and identified ivy:resolve as
the main time consumer.
While having similar dependency trees in most of the components in the multi module build,
all artifacts seem to be searched in the remote repository all the time.

We know that dynamic and SNAPSHOT versions are one reason for that, but still there must be
a way to keep the results at least for one build fresh.
This is where we found the defaultTTL or ttl aspects of caches (

With some rough testing we figured out that enabling the checkmodified flag on a resolver
forces every artifact to be resolved (be it a SNAPSHOT dependency or not, all artifacts are
listed as searched by the resolve task).
But when we set checkmodified="false" and a short defaultTTL on the cache, repeated calls
will not trigger a search until the time expires.

Here's the resolver configuration for the repository containing SNAPSHOT and released artifacts:

<ibiblio name="all-development" m2compatible="true" latest="my-strategy" useMavenMetadata="false"
            checkmodified="false" changingMatcher="regexp" changingPattern=".*-SNAPSHOT.*"

and this is how our cache is configured:

<cache name="my-cache" useOrigin="true" basedir="${ivy.cache.repository.dir}"
            ivyPattern="${ivy.cache.ivy-pattern}" artifactPattern="${ivy.cache.artifact-pattern}"
            lockStrategy="artifact-lock-nio" />

Anyone can give brief explanation when to use what and which sideeffects to expect? The documentation
is not exactly clear about how to handle changing artifacts in a effective way.

any help would be appreciated
Daniel Geißler

SALT Solutions AG<>

Vorstand: Dieter Heyde (Vors.), Dr. Bernhard Blüthner, Dr. Hans Christoph Dönges, Claudia
Lang, Frank Reinecke
Vorsitzender des Aufsichtsrats: Dr. Michael Fuchs
Sitz: München, AG München, HRB 228545

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