How to stop p2 caching

[Zohhak]

Hi,

is there an option to for tycho to stop caching? I somehow cant get my builds to fetch new snapshot version from my nexus p2 repository (http).

With version 4.0.7 I tried:
-U
-Dtycho.localArtifacts=ignore
-Dtycho.p2.transport.min-cache-minutes=0

None of these work. I always get a FileNotFoundException, that an older snapshot version of a p2-plugin could not be fetched. Which does not exist anymore. Deleting the local maven repository fixes the problem, but thats not really a permanent solution. The next snapshot version cant be loaded again.

Somehow all discussions/issues i found where about more caching 😅.

Thanks in advance

[laeubi]

P2 has no notation of snapshot so you probably want to sahre a bit more details, e.g. what exact error are you getting?

[Zohhak]

My setup is as follows:

A base project with several utility-bundles. all these bundles have a version like 1.2.3.qualifier. the bundles are put into a serveral features, then into an updatesite and this updatesite is deployed onto our nexus.

A second project, consuming this updatesite via targetplatform. Bundles in here have a dependency on the utility bundles.

Both are build with tycho.

The exact error (the version in nexus is 1.4.3.202405130928.jar):

[ERROR] Could not mirror artifact osgi.bundle,de.cjt.runin.common.core,1.4.3.202405061522 into the local Maven repository.See log output for details. http://172.16.100.41:8080/nexus/content/repositories/mirror/aqua/common/feature/3rdparty_karaf4_3/plugins/de.cjt.runin.common.core_1.4.3.202405061522.jar
org.eclipse.tycho.p2.repository.MirroringArtifactProvider$MirroringFailedException: Could not mirror artifact osgi.bundle,de.cjt.runin.common.core,1.4.3.202405061522 into the local Maven repository.See log output for details.
	at org.eclipse.tycho.p2.repository.MirroringArtifactProvider.downloadArtifact(MirroringArtifactProvider.java:330)
	at org.eclipse.tycho.p2.repository.MirroringArtifactProvider.makeOneFormatLocallyAvailable(MirroringArtifactProvider.java:264)
	at org.eclipse.tycho.p2.repository.MirroringArtifactProvider.makeLocallyAvailable(MirroringArtifactProvider.java:206)
	at org.eclipse.tycho.p2.repository.MirroringArtifactProvider.getArtifactFile(MirroringArtifactProvider.java:138)
	at org.eclipse.tycho.p2.repository.CompositeArtifactProvider.getArtifactFile(CompositeArtifactProvider.java:89)
	at org.eclipse.tycho.p2resolver.TargetPlatformBaseImpl.getLocalArtifactFile(TargetPlatformBaseImpl.java:169)
	at org.eclipse.tycho.core.resolver.DefaultP2ResolutionResult.lambda$addArtifact$2(DefaultP2ResolutionResult.java:90)
	at org.eclipse.tycho.core.resolver.DefaultP2ResolutionResultEntry.getLocation(DefaultP2ResolutionResultEntry.java:73)
	at org.eclipse.tycho.p2resolver.P2DependencyResolver.lambda$newDefaultTargetPlatform$7(P2DependencyResolver.java:406)
	at org.eclipse.tycho.core.osgitools.targetplatform.ArtifactCollection.lambda$addArtifactFile$2(ArtifactCollection.java:69)
	at org.eclipse.tycho.core.osgitools.DefaultArtifactDescriptor.getLocation(DefaultArtifactDescriptor.java:72)
	at org.eclipse.tycho.core.osgitools.targetplatform.ArtifactCollection.lambda$addArtifact$3(ArtifactCollection.java:148)
	at org.eclipse.tycho.core.osgitools.DefaultArtifactDescriptor.getLocation(DefaultArtifactDescriptor.java:72)
	at org.eclipse.tycho.core.osgitools.targetplatform.ArtifactCollection.lambda$addArtifact$3(ArtifactCollection.java:148)
	at org.eclipse.tycho.core.osgitools.DefaultArtifactDescriptor.getLocation(DefaultArtifactDescriptor.java:72)
	at org.eclipse.tycho.core.maven.MavenDependencyInjector.collectExternalDependencies(MavenDependencyInjector.java:255)
	at org.eclipse.tycho.core.maven.MavenDependencyInjector.addDependency(MavenDependencyInjector.java:219)
	at org.eclipse.tycho.core.maven.MavenDependencyInjector.injectMavenDependencies(MavenDependencyInjector.java:120)
	at org.eclipse.tycho.p2resolver.P2DependencyResolver.injectDependenciesIntoMavenModel(P2DependencyResolver.java:432)
	at org.eclipse.tycho.core.resolver.DefaultTychoResolver.resolveProject(DefaultTychoResolver.java:100)
	at org.eclipse.tycho.core.maven.TychoProjectExecutionListener.beforeProjectLifecycleExecution(TychoProjectExecutionListener.java:111)
	at org.apache.maven.lifecycle.internal.CompoundProjectExecutionListener.beforeProjectLifecycleExecution(CompoundProjectExecutionListener.java:42)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:103)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:73)
	at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:53)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:118)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:261)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:173)
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:101)
	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:906)
	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:283)
	at org.apache.maven.cli.MavenCli.main(MavenCli.java:206)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:283)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:226)
	at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:407)
	at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:348)
Caused by: java.io.FileNotFoundException: http://172.16.100.41:8080/nexus/content/repositories/mirror/aqua/common/feature/3rdparty_karaf4_3/plugins/de.cjt.runin.common.core_1.4.3.202405061522.jar
	at org.eclipse.tycho.p2maven.transport.Response.checkResponseCode(Response.java:43)
	at org.eclipse.tycho.p2maven.transport.SharedHttpCacheStorage$CacheLine.fetchFile(SharedHttpCacheStorage.java:279)
	at org.eclipse.tycho.p2maven.transport.SharedHttpCacheStorage$2.getCacheFile(SharedHttpCacheStorage.java:133)
	at org.eclipse.tycho.p2maven.transport.HttpTransportProtocolHandler.getFile(HttpTransportProtocolHandler.java:50)
	at org.eclipse.tycho.p2maven.transport.TychoRepositoryTransport.stream(TychoRepositoryTransport.java:144)
	at org.eclipse.tycho.p2maven.transport.TychoRepositoryTransport.download(TychoRepositoryTransport.java:105)
	at org.eclipse.equinox.internal.p2.artifact.repository.simple.SimpleArtifactRepository.downloadArtifact(SimpleArtifactRepository.java:737)
	at org.eclipse.equinox.internal.p2.artifact.repository.simple.SimpleArtifactRepository.downloadArtifact(SimpleArtifactRepository.java:659)
	at org.eclipse.equinox.internal.p2.artifact.repository.simple.SimpleArtifactRepository.getArtifact(SimpleArtifactRepository.java:796)
	at org.eclipse.tycho.p2.repository.RepositoryArtifactProvider.getArtifactFromOneMirror(RepositoryArtifactProvider.java:243)
	at org.eclipse.tycho.p2.repository.RepositoryArtifactProvider.getArtifactFromAnyMirror(RepositoryArtifactProvider.java:223)
	at org.eclipse.tycho.p2.repository.RepositoryArtifactProvider$1.perform(RepositoryArtifactProvider.java:198)
	at org.eclipse.equinox.internal.p2.artifact.repository.simple.SimpleArtifactRepository.getArtifact(SimpleArtifactRepository.java:778)
	at org.eclipse.equinox.internal.p2.artifact.repository.simple.SimpleArtifactRepository.getArtifacts(SimpleArtifactRepository.java:858)
	at org.eclipse.tycho.p2.repository.LazyArtifactRepository.getArtifacts(LazyArtifactRepository.java:102)
	at org.eclipse.tycho.p2.repository.RepositoryArtifactProvider.getArtifactFromAnyChildRepository(RepositoryArtifactProvider.java:210)
	at org.eclipse.tycho.p2.repository.RepositoryArtifactProvider.getArtifactFromAnyFormatAvailableInRepository(RepositoryArtifactProvider.java:177)
	at org.eclipse.tycho.p2.repository.RepositoryArtifactProvider.getArtifactFromAnySource(RepositoryArtifactProvider.java:163)
	at org.eclipse.tycho.p2.repository.CompositeArtifactProviderBaseImpl.getArtifact(CompositeArtifactProviderBaseImpl.java:55)
	at org.eclipse.tycho.p2.repository.MirroringArtifactProvider.downloadCanonicalArtifact(MirroringArtifactProvider.java:347)
	at org.eclipse.tycho.p2.repository.MirroringArtifactProvider.downloadMostSpecificNeededFormatOfArtifact(MirroringArtifactProvider.java:340)
	at org.eclipse.tycho.p2.repository.MirroringArtifactProvider.downloadArtifact(MirroringArtifactProvider.java:325)
	... 39 more

[laeubi]

This looks like somewhere in your setup you have bad meta-data (e.g. server claims there is no update but actually it was changed). Beside that -U is the correct option as it asks the server if there are any updates.

[Zohhak]

It actually was bad meta-data but not the ones i had expected. It took some time, but it looks like our nexus provides wrong checksums, and with the new HttpCache (well not new, but we are in the process of migrating), the local files newer got invalidated. Thank you for the hint.