Trying to download all maven dependencies for a complex project to speed up subsequent builds. There are some dependencies that are not outlined on pom.xml, such as com.apollographql.apollo:apollo-compiler which are triggered as part of the generate-sources phase (from a dependency I do include apollo-client-maven-plugin)
my original plan of using maven dependency:go-offline did not work because these jars are not included.
i'm currently using the work around maven dependency:go-offline generate-sources which ensure that those extra jars are downloaded, but now i have to wait for the actual generation of the sources...
Is there a way to just force maven to detect dependencies fully?
Alternatively, any way to have incremental mvn --offline, i.e. uses the jar locally without updating repository info, but do download missing ones?
Related
When I build a maven project, I see in cmd the dependencies download commands, but I do not see in which goal of which plugin the download is performed. And at what phase it happens ?
Resolving dependency is Maven core feature is done during project model build (reading project structure).
So no plugin and no phase is applicable for dependency resolution - it is done before first plugin is run.
When some of dependencies was resolved early and are currently saved in ~/.m2/repository - next downloading will not occurs, so you can not see Downloading from ... for next project build.
I cloned the git repository of Apache ActiveMQ Artemis project (https://github.com/apache/activemq-artemis) and then typed
mvn -Ptests test -pl :integration-tests
I was surprised to see log messages like the following
...
Downloading: http://repository.apache.org/snapshots/org/apache/activemq/artemis-selector/1.4.0-SNAPSHOT/artemis-selector-1.4.0-20160625.030221-11.jar
Downloading: http://repository.apache.org/snapshots/org/apache/activemq/artemis-core-client/1.4.0-SNAPSHOT/artemis-core-client-1.4.0-20160625.030211-11.jar
...
Since e.g. artemis-core-client is contained in the git repository I cloned in the beginning, I'd have expected maven just builds it from there.
That way, when I make changes in the core client source, they get picked up by the integration tests.
Instead, maven is downloading the jar from the repository.
Question: How do I configure maven to always build all modules that are in the git repository and download only "true" dependencies, which I mean things not in the git repository?
You are not executing the Maven build on the main project, on the main pom.xml which indeed defines the artemis-selector and artemis-core-client modules, among others.
You are executing the Maven build on the tests and its pom.xml, where only tests modules are defined. This is a side/test project, which has as parent the previous pom file, but it doesn't play any role in its parent modules definition. Hence, dependencies are not resolved as modules but as Maven dependencies.
You should firstly install (via mvn clean install) the former project, so that libraries will be available in your local Maven cache (hence no downloading would be triggered), then execute the tests project.
Check the Maven docs for a inheritance vs aggregation difference to further clarify it.
From the Stack Overflow, the follow threads could also be interesting:
What is the difference between using maven -pl option and running maven from module level?
Maven multi module project cannot find sibling module
I'm trying to build a p2 repository from Tycho feature artifacts which are deployed in a remote Maven repository, without having to install the artifacts into the local Maven repository first (as in Tycho fails to resolve reference from product to eclipse-feature from a different reactor build), and without having to build all features and the repository together in a single reactor build.
Background
I have a multi-module Tycho project that builds several Eclipse plugins and features.
So that I can build each module separately - and so that I can reference OSGI artifacts in our Nexus Maven repository - I have enabled <pomDependencies>consider</pomDependencies> in my target platform, and added Maven dependencies between the modules or to the repository artifacts as usual with <dependency/> elements.
This works well - I can build the features or run the plugin tests without their dependant plugins being either in my local Maven repository or in the same reactor build. For example, when I run mvn test on a plugin test project, the relevant dependencies will be downloaded from Nexus and Tycho will happily resolve the Import-Packages in my manifest against these, build everything and run the tests. So far so good.
I would like to generate a p2 repository from these features so that I can install them in Eclipse from an update site, and the advertised way to do this is with the eclipse-repository packaging type. But here the plan falls down - Tycho doesn't seem to be able to resolve feature dependencies when building repositories in the same way as it can resolve plugin dependencies when building features. All attempts yield:
[ERROR] Cannot resolve project dependencies:
[ERROR] Software being installed: my.eclipse.repository raw:0.0.1.'SNAPSHOT'/format(n[.n=0;[.n=0;[-S]]]):0.0.1-SNAPSHOT
[ERROR] Missing requirement: my.eclipse.repository raw:0.0.1.'SNAPSHOT'/format(n[.n=0;[.n=0;[-S]]]):0.0.1-SNAPSHOT requires 'my.prj.eclipse.project.feature.feature.group 0.0.0' but it could not be found
There are two ways I have successfully built the p2 repository:
As part of the same reactor build. If I make the eclipse-repository a module within the Tycho multi-module project, and build the whole project at once with e.g. mvn verify, the features are resolved fine. But I don't want to do this. I would prefer to build modules individually. This means our CI can have an indicator for each module, and we can immediately see what module tests have failed in; it gives us opportunities for parallelising builds; and we avoid having to be constantly running builds on modules that haven't changed. It would be a shame to have to use a monolithic Maven build.
If I install the Tycho project into my local Maven repository, by running mvn install on the dependency. But I don't want to do this either, because this would mean the build is inherently irreproducable, as it would be sensitive to the state of the local repository. Our CI is currently set up to maintain a Maven repository per job and to completely wipe it at the start of execution, to shield us from this potential messiness.
So my question is: is there a third way? Is there any way I can get the Tycho plugin responsible for building eclipse-repository packaging types to download features from a remote Maven repository? Or any other way I can build the p2 repository from plugins that have been individually built and deployed to the Maven repository?
Things I've tried include:
specifiying the Maven feature depedencies as both jar and eclipse-feature
explicitly adding the features to the target platform, like
...
<artifactId>target-platform-configuration</artifactId>
<version>${tycho.version}</version>
<configuration>
<dependency-resolution>
<extraRequirements>
<requirement>
<type>eclipse-feature</type>
<id>my.prj.eclipse.project.feature</id>
<versionRange>0.0.0</versionRange>
</requirement>
...
The closest thing I've found to a decent solution is have a multi-module Tycho project that just contains the repository and features.
feature-project
|- feature1 (eclipse-feature)
|- feature2 (eclipse-feature)
|- repository (eclipse-repository)
Building this works - all plugins added to the top-level POM are downloaded from Nexus, available for inclusion in each feature and included in the generated repository.
However this is far from ideal because I can no longer store my features logically alongside my plugins; they need to be in separate project hierarchies. Attempting to build the features and repository separately, like with mvn clean verify -pl :feature1,feature2,repository, fails presumably due to Bug 380152.
Is there a better way? Any help would be gratefully received.
Many thanks
(As an aside: building the repository with mvn clean verify -Dtycho.localArtifacts=ignore will succeed if the features are present in the local Maven repository, and won't show you the warning that artifacts are being resolved from the local repo... is this a bug?)
I am pretty impressed by your thorough analysis. You've almost got everything covered which is possible with the current Tycho version (0.22.0) - except for the solution which is so unintuitive that I wouldn't have expected anyone to be able to guess it (see below). Note however that there is a small fix required to also make the solution work for SNAPSHOT artifacts.
But first, I'd like to provide some technical (and historical) background for what you have observed:
pomDependencies=consider only works for plug-ins: The use case for this functionality was to allow referencing plug-ins (or more precisely OSGi bundles) from Maven repositories. So when the flag is set and the project has dependencies to JARs, Tycho will check if they are OSGi bundles, generate the p2 metadata for them on-the-fly, and add them to the target platform. There is no similar support for feature JARs because these usually don't exist in Maven repositories.
But what about Tycho-built projects? These may deploy into Maven repositories! Yes, this is true, and this is why I tried to extend the pomDependencies concept to allow for what you are trying to do. The idea was that every time Tycho considers a POM dependency for the target platform, it also checks if the p2 index files ...-p2metadata.xml and ...-p2artifacts.xml exist. However this turned out to infer a massive performance penalty because it generally takes very long for a Maven repository server to figure out that an artifact does not exist. So the remote download was disabled, and replaced with a look-up in the local Maven repository. In this way, two Tycho builds could set -Dtycho.localArtifacts=ignore and would still be able to exchange the artifacts specified in the POM via the local Maven repository.
Knowing these implementation details, we get to the following solution: Instead of only adding a POM dependency from the repository to the feature artifact, you also need to add dependencies to the p2metadata and p2artifacts files. Example:
<dependencies>
<dependency>
<groupId>myproject</groupId>
<artifactId>myproject.feature</artifactId>
<version>0.1.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>myproject</groupId>
<artifactId>myproject.feature</artifactId>
<version>0.1.0-SNAPSHOT</version>
<classifier>p2metadata</classifier>
<type>xml</type>
</dependency>
<dependency>
<groupId>myproject</groupId>
<artifactId>myproject.feature</artifactId>
<version>0.1.0-SNAPSHOT</version>
<classifier>p2artifacts</classifier>
<type>xml</type>
</dependency>
</dependencies>
This makes Maven also download these p2 index files, so Tycho recognizes the main artifact as Tycho artifact. In this way, you can also get an eclipse-feature into the target platform via POM dependencies - at least almost: With 0.22.0, the repository build passes, but the feature.jar artifact is missing. I already debugged this issue, and it is easy to fix.
Obviously the syntax with three <dependency> elements for every actual dependency is not nice. It should be possible to boil this down to a single p2artifacts element - but this is more work. In case you are interested in this feature, you could open an enhancement request in Tycho's issue tracker.
My situation: I have project which contains several Maven modules. I make changes to one of them. Suddenly I find out, that my project is no longer possible to be built because of the errors in other modules. To fix this I need to run SVN UPDATE and rebuilt the project.
My assumption: probably, during the build process of my module some of the artifacts are taken from central repository and have the most newest version, while others are still outdated and taken from my local repo.
A question: I don't want to rebuild my project each time someone updates ANOTHER Maven module. I want to download the already built artefacts from the central repository without rebuilding them by myself. Is it possible?
You can tell Reactor which modules to build. In your case when you only change a single module and want to speed up the build you can pass -pl (Project Location) parameter to maven. For example:
mvn -pl module-with-changes
That will build single module, while taking other dependencies from your local Maven Repository or download from Central (whatever is the latest). That said, if you already ran mvn install for whole project and other artifacts have not been updated in Central repository, then Maven will see your local artifacts as latest and will not re-download them.
Another issue you might get with -pl parameter is when other modules in your project depend on the module that you are building. If there is a problem in dependent module you will not see it by building only the dependency model. To avoid that you can pass -amd (Also Make Dependents). Like this:
mvn -pl module-with-changes -amd
That will trigger the build for module-with-changes + modules that depend on module-with-changes + their dependents.
You can get more info about Reactor parameters from here:
http://www.sonatype.com/people/2009/10/maven-tips-and-tricks-advanced-reactor-options/
I've been searching around but I could not find the answer.
What I want is to download a pom.xml dependency, and execute some goals (profiles) against it.
I mean:
pom a -> mvn clean install -Psome
donwload the pom b and execute clean package -Panother
This is quite easy with the maven-exec plugin. And I already download the pom with the dependency plugin.
But I wonder if there is a specific plugin.
You could look at bootstrapping a maven project which is supported by maven scm plugin. This assumes you have the pom in an scm.