Download Apache Maven 3.3.9
Charlyn Scifres
I was testing the move from a Jenkins docker image to another using Thinbacvkup and restore the backup and restore went well and of course it didn't bring maven with it (No problem there) I went online and got the latest apache maven bin file (apache-maven-3.8.4-bin), extracted and set up the global tool configuration, export M2_HOME ...ETC. BUT for some reason, it didn't work giving me the same message
searched and searched nothing worked, so I went to the original docker and got the same maven from there (apache-maven-3.5.3-bin)edited the configs and all, and it worked but now I wanted to know why did this work and that won't is there something with my project, build or what?
I actually ended up changing a few things in the maven plugin about 1-2 years ago that fixed a similar issue I had. If you want to try upgrading the maven plugin to 1.2.0 in your build pom.xml that might fix that for you.
1) Declare the com.atlassian.maven.plugins pluginGroup in .m2/settings.xml to ensure that Maven will not try to resolve 'clover' goals to a very old Clover 2.4 (org.apache.maven.plugins:maven-clover-plugin).
Proxying the Oracle Maven Repository requires special HTTP options for the maven2 (proxy) recipe. Also, you must register for an account to access the external repository. Configure the proxy repository to access the Oracle repository, with these additional steps:
A hosted Maven repository can be used to deploy your own as well as third-party components. A default installation of Nexus Repository Manager includes a two hosted Maven repositories. The maven-releases repository uses a release version policy and the maven-snapshots repository uses a snapshot version policy.
A repository group is the recommended way to expose all your Maven repositories from the repository manager to your users, without needing any further client side configuration. A repository group allows you to expose the aggregated content of multiple proxy and hosted repositories as well as other repository groups with one URL for tool configuration. This is possible for Maven repositories by creating a new repository with the maven2 (group) recipe as documented in Repository Management.
A typical, useful example is the maven-public group that is configured by default. It aggregates the maven-central proxy repository with the maven-releases and maven-snapshots hosted repositories. Using the URL of the repository group gives you access to the packages in all three repositories with one URL. Any new component added as well as any new repositories added to the group will automatically be available.
Full example projects can be found in the maven folder of the example project in the nexus-3.x branch. A full build of the simple-project, including downloading the declared dependencies and uploading the build output to the repository manager can be invoked with mvn clean deploy.
Some weeks ago I posted an entry on Publishing to Maven Central with Apache Maven which shows the configuration I put in place on a handful of Open Source projects I maintain. The trigger that starts a release workflow is a commit message with "[release]" as a prefix. I was quite happy with the results, after all I've got the whole release pipeline working on automatic, however two things were nagging me. Firstly that a release workflow would always require a commit. What if I just wanted to publish a release on the go? Add up pushing a release from any branch? Secondly is that while the maven release plugin takes care of setting the release version, tagging, building & publishing, then bumping all POM versions again and committing all changes I just couldn't shake the feeling that something might break during the release and I'll end up with a broken tag. Mind that the release plugin cannot fully rollback a broken release just yet. Also, passing additional arguments to the release build is a bit tricky.
First things first, I've got rid of maven-release plugin, instead I'll use the nexus-staging plugin that bounds to the deploy phase. This means I no longer have automatic versioning & tagging, but I can do that in the workflow itself. Also, moved the nexus-staging plugin to a profile, there's no need to have it configured on every run, particularly as it's run as an extension which adds a few milliseconds on every invocation. Lesson learned, if you don't need a plugin for your main execution then put it in a profile and activate when required; don't waste time executing goals that do not provide value for that particular build invocation. The POM contains the following profile definition
I feel that this workflow setup gives me more fine grained control. The only thing I miss is the automatic version bump that the maven-release plugin performs at the end, however this can easily be solved by manually invoking the maven-versions plugin when needed.
After fumbling around with the configuration a bit more I ended up creating a parent POM project for all my Maven projects. This parent POM defines all the common behavior I want to share on all other projects, and as such it defines the profiles previously mentioned. The project is located at -maven-parent/ and it also defines a manual trigger as explained in this post.
The archetype generates a BOM (bill of materials) artifact dependency for the software.amazon.awssdk group id. With a BOM, you do not have to specify the maven version for individual artifact dependencies that share the same group id.
The s3 dependency excludes the the netty-nio-client and apache-client transitive dependencies. In place of either of those HTTP clients, the archetype includes the url-connection-client dependency, which helps reduce the startup latency for AWS Lambda functions.
if artifactId starts with last section of groupId that portion is removed.eg.org.apache.maven:maven-core -> org.apache.maven.core The computed symbolic name is also stored in the $(maven-symbolicname) property in case you want to add attributes or directives to it.
Consider this more real-world example using Felix' Log Service implementation.The Log Service project is comprised of a single package: org.apache.felix.log.impl.It has a dependency on the core OSGi interfaces as well as a dependency on the compendium OSGi interfaces for the specific log service interfaces.The following is its POM file:
If you want to keep your project packaging type (for example "jar") but would like to add OSGi metadata you can use the manifest goal to generate a bundle manifest.The maven-jar-plugin can then be used to add this manifest to the final artifact.For example:
The plugin uses the instruction to transform the project dependencies into and clauses, which are then appended to the current set of instructions and passed onto BND.If you want the embedded dependencies to be at the start or middle of or then you can use maven-dependencies, which will automatically expand to the relevant clauses.
The ant goal creates a customized build.xml Ant script along with a collection of BND instructions and properties, taken from the current project and stored in maven-build.bnd.You also need to run `ant:ant` to create the standard Ant support tasks to download Maven dependencies and perform compilation, etc.
Sometimes you would like to clean your local OBR because it contains bundles that are no longer in your local Maven repository.This case often occurs when artifacts were deleted manually.The maven-bundle-plugin provides a simple goal to check for missing bundles, and remove them from the local OBR.
The parallel build feature has been subject to extensive testing, but the maven ecosystem is diverse so there will be undiscovered issues. We recommend that users of the parallel build feature establish their own reference as to how well this works for their project, preferably starting with everyday builds as opposed to final production releases.
The functionality within the Maven3 core is thread safe and well behaved, but the maven ecosystem consists of a large number of subsystems, and a lot of plugins have a large number of dependencies. Not all of these plugins/libraries were written with thread safety in mind. As of beta-2 maven 3 will warn noisily of any plugins present in the build that are not @threadSafe.
Each node in the graph represents a module in a multi-module build, the "levels" simply indicate the distance to the first module in the internal reactor dependency graph. Maven calculates this graph based on declared inter-module dependencies for a multi-module build. Note that the parent maven project is also a dependency, which explains why there is a single node on top of most project graphs. Dependencies outside the reactor do not influence this graph.
If you want you can checkout the Jena sources, build the artifacts andinstall them in your local Maven repository, then you simply checkout the sourcetree and build with mavenmvn install. This assumes you have Maven and Git installed:
If you need to customize the compiler flags used by the plugin, like in development mode, add a configuration section to the plugin block and set the compilerArgs property just as you would when configuring maven-compiler-plugin.You can also set source, target, and jvmArgs.For example, to pass --enable-preview to both the JVM and javac:
By default the generated uber JAR file name will have the -runner suffix, unless it was overriden by configuring a custom one with quarkus.package.runner-suffix configuration option.If the runner suffix is not desired, it can be disabled by setting quarkus.package.add-runner-suffix configuration option to false, in which case the uber JAR will replace the original JARfile generated by maven-jar-plugin for the application module.
The best way to enable CDI bean discovery for a module in a multi-module project would be to include the jandex-maven-plugin,unless it is the main application module already configured with the quarkus-maven-plugin, in which case it will be indexed automatically.
In Maven there appears to be a notion of the top-level project (that is exposed as a project property $session.topLevelProject.basedir.absolutePath)and the multi-module project directory (that is available as property $maven.multiModuleProjectDirectory). These directories might not always match!
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