I have added a repository to download artifacts and I have seen maven using that repository to download artifacts, but only for particular artifacts of that repository maven tries to download from mvn central repository. When I chek that artifact on added repository it's available. What could be the issue ? In which situations maven tries to download from central repository ?
Specific issues is highlighted in ,
Magnolia Demo project mvn build failed due to not able to fetch magnolia-setproperty-maven-plugin
All the Maven dependencies are first downloaded from your local repository, then if they are not found, Maven will try in any remote repository that you define in your POM file or the settings.xml and for last it will try to download from Maven Central.
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I would like to configure a nexus repository to only manage jars that I install. Right now it also retrieves jars from maven central and stores them in the repository. I don't want that to happen.
Can anyone point me in the right direction how this can be achieved?
When you say to store the "jars that are installed" , if you are referring to the artifacts being created by your project, you can have a hosted maven repository snapshot/release and use maven deploy plugin to upload it on to your nexus repository.
You can either create a profile in your pom and activate in your install it on mvn install phase to upload the artifacts to your nexus repository.
I have internal nexus repository. I want to install plugins from internal repository, having the dependencies which I want to download from the central maven repository. I am new to maven and really struggling to do the required configuration.
Once you deployed your own plugins into a nexus repository (say "releases") add that repository into the Nexus Group that contains both maven central and your releases repository. Usually developers will only use one url (mirror configured in settings.xml) from nexus and deploy artifacts into a specific repository.
In addition you need to make sure to add the maven group id of your plugins into settings.xml in the pluginGroups section: https://maven.apache.org/settings.html#Plugin_Groups
That should already work.
I'm trying to build a project with maven and I have a repository I'm pulling packages from which I've configured in the %USER%/.m2/settings.xml file. The problem is it's pulling the packages from that repository but not from the maven central repository.
My question is if I create a settings.xml file and add my own repository to it, do I then also need the maven central repo?
It's possible to configure Maven to retrieve from both a private Maven repository manager (Like Nexus, Artifactory or Achiva) and also download from Maven Central.
Personally I prefer to confgure my Maven repository manager to proxy Maven Central. Within Nexus I create a repository group that combines the Maven Central Proxy with my hosted repositories. In this way a single URL gives me all my project dependencies. This simplifies Maven client configuration.
Once I change the repository url and I want to test how this center downloading jars (in local repo I have downloaded jars and I want to delete those jars and restart download).
Does any maven plugin or command support this?
I think you need:
mvn dependency:purge-local-repository
See Purging local repository dependencies
I have setup an in-house Sonatype Nexus repository and configure the maven to check my local Nexus instead of getting artifacts directly from public repositories.
http://www.sonatype.com/books/nexus-book/reference/config-sect-intro.html
Our project was able to download the most artifacts except one artifact in Maven central.
Here is the build error:
Failed to execute goal on project shindig-gadgets: Could not resolve dependencies for project org.apache.shindig:shindig-gadgets:jar:3.0.0-SNAPSHOT: Could not find artifact com.ibm.icu:icu4j:jar:4.6 in nexus (http://my_nexus_repository:8081/nexus/content/groups/public) -> [Help 1]
I see that icu4j-4.6.jar does exist in the Maven central repository. On my local nexus repository, it doesn't exist. I see only icu4j-4.6.pom exists on my local nexus repository.
It's not like my nexus repository setting is totally broken. maven project has successfully downloaded numerous jar files from multiple public repositories via my local nexus maven repository except icu4j-4.6.jar.
I don't understand why I'm having a problem with only icu4j-4.6.jar. Would it be incorrectly cached on either my local maven or nexus maven repository?
If it was incorrectly cached, how can I clean the local maven or nexus maven repository?
The similar problem is described at
Missing maven dependency using nexus setup
icu4j-4.6.jar does not show up in the search list. Only icu4j-4.6.pom shows up in the search list. I don't think is Snapshot VS Release issue because icu4j-4.6.jar seems release jar.
Is it possible that the nexus repo just stopped responding for a while? You can try mvn -X (or -d?) to get detailed info about what is going on. You might also try configuring an alternative repo.
Perhaps you haven't enabled remote index downloads from Maven Central. This would explain why only the POM file appears in your local search (The only file which has been downloaded via the proxy repo).
There might be another issue causing the download failure for the jar itself.... I suppose try and solve one problem at a time :-)
Try adding -U to your mvn arguments to force an update of your local repository.
You could also have corrupt meta data in the repo. In which case, delete that artifact from the repo's cache and let it refresh.
If the artifact in question was cached in properly from the proxy repository, using mvn -U will fix the problem
However if you are seeing pom on your nexus ,this usually happens when the artifact from the proxy repository is not cached in properly. The way to fix is
1) Browse to the component in the Proxy Repository.
2) Invalidate the cache for the repository and reindex the Nexus repository.
3) run mvn clean -U