Ivy publish to repository doesn't update local cache - hudson

Question

Given:
Building using Hudson/Ant.
Ivy cache timeout is set to 5 min.
Ivy repository contains has Project A version 2.2.2 and Project B version 1.1.1.
Project B relies on Project A.
Events:
API change is made to Project A.
Related changes are made to Project B.
Project A version 2.2.3 is built and published to the repository.
Under 5 minutes later, Project B version 1.1.2 is built.
Project B fails, still pulling in Project A version 2.2.2 from the Ivy Cache.
After 5 minutes, Project B will build correctly, with Project A version 2.2.3
I've looked but don't see an obvious solution (except not caching?). Is there a setting on publish that will update the local cache and the repo? Do you need to explicitly publish to both?

Answer 1

Just speculation: if A and B are built on the same machine, would doing an <ivy:resolve refresh="true"> at the end of A's build refresh the cache? That doesn't help if A and B build on separate machines, of course...

Answer 2

One solution, similar to (but not as bad as) not caching is to decrease the time things live in the cache via setting the following ivy property:
ivy.cache.ttl.default = 30s
Maybe that would fix your problem, for now. Although, it's not much better than not caching.
Off the top of my head, another thing I might try is to turn off caching but then re-implement caching manually by creating a filesystem resolver in your ivy settings file that points to the cache and placing it lower on the chain. That would look something like this:
<ivysettings>
<settings defaultResolver="all-repositories" />
<include file="ivysettings-common.xml" />
<resolvers>
<chain name="all-repositories" returnFirst="true" >
...
<ibiblio name="ibiblio" m2compatible="true" />
<filesystem name="manual-cache">
<ivy pattern="${ivy.default.ivy.user.dir}/cache/${ivy.local.default.ivy.pattern}" />
<artifact pattern="${ivy.default.ivy.user.dir}/cache/${ivy.local.default.artifact.pattern}" />
</filesystem>
...
</chain>
</resolvers>
</ivysettings>
Note: that ivy.default.ivy.user.dir, ivy.local.default.ivy.pattern and ivy.local.default.artifact.pattern are built-in properties that are set by default. I'm referencing them here in this example but I wouldn't need to make any other special effort to set them (they contain proper default values, already).
I hope one of these approaches can address your issue. Those are the only two possible solutions that come to mind, right now.

Answer 3

In the ivy file of project B you need to set the changing attribute to true on the dependency.
<dependency org="org.example" name="A" revision="latest.integration" changing="true" />
See the ivy documentation