Maven Brew

  

Wynkoop Brewing is one of Colorado's original brew pubs and is located just 2 blocks from The Maven Hotel in Denver's historic LoDo District. Denver Beer Co Canworks 4455 Jason St. Denver, CO 80211. Once I did this and tried running existing projects which use java8. To my surprise, maven began using java10 as its default java version, even though my JAVAHOME is set to use java8 — /usr/libexec/javahome -v 1.8. Given, my installation was done using brew — Brew is simply a package manager for Mac OS, my M2HOME was automatically set up.

  1. Stone Brewery Locations
  2. Manchester Brewery Nh

Recently, the Maven community decided to push forward and start workingtowards a 4.0.0 release.The first question after this announcement is of course: what can we expect Maven 4 to bring us?A lot - and in this post, we want to highlight some of the features that we are particularly excited about.

So without further ado, let’s dive into some of the new features that will ship with Maven 4.This post highlights a few, but the complete list is a lot longer and even more impressive.

Improved behaviour of reactor command-line arguments

The first thing that will be making a lot of impact on the day-to-day use of Maven is a group of big improvements in the “Reactor”.It may be a part of Maven that you’re not aware of as an end-user, but it’s actually very important.When you invoke Maven, it’s the Reactors job to build the project structure, make sure all modules are built in the correct order and eventually build those projects.The Reactor made its way into Maven 3, which was a great improvement in the way Maven worked on multi-module projects.

As such, the improvements to this part of Maven are most relevant to those that use multi-module projects.A recent poll we did during our J-Fall 2020 talk shows that this feature is now wide-spread.

In the following paragraphs, let’s assume we have a Maven project with three modules: common, client and app.The modules depend on each other:

Use --also-make together with --resume-from

The first improvement in the Reactor is a bug fix.Previously, if your project build failed on the client module, you would get a hint to resume the build with --resume-from :client.But if you did that, the build would break again: this time because Maven couldn’t find the common module.You might think that adding --also-make (or -am) would address this, but it wouldn’t.This long-standing bug is no longer there.If you combine --resume-from :client with --also-make, the Reactor will find all modules in your project and continue the build as you requested.

Automatically resume from the last point of failure

But chances are you will not notice.The thing with --resume-from :client is that it makes you think more than necessary.With Maven 4, you can make your life even easier and use --resume, or -r for short.It will automatically resume the build from the module that last failed.

But there’s more!Maybe you are using parallel builds.One sequence of modules was successfully built, while the build of another sequence of modules broke.In that scenario, using -r will skip the modules that were successful in the previous build.

The combination of these two features may well improve the time you need to build your large, enterprise software project!

Root-reactor aware subfolder builds

Imagine the app module in our earlier example is a web application.With Maven 3, when you wanted to start it to see if it works, you might use for example mvn jetty:run.But if you run that from the root project, it will run jetty:run in client and common as well.Since those modules do not contain a web application, it will fail.

Running mvn jetty:run inside the app module didn’t work either, because Maven would not be able to resolve the client and common modules.That’s why many people got into the bad habit of running mvn install first, as a workaround, so Maven would resolve client and common from the local repository.The same was true for selecting the project to build with mvn -f app/pom.xml - again, Maven would not be able to resolve the client and common modules.

This four-year-old improvement made it into Maven 4 as well.There are two ways in which you can use it:

  1. Run mvn jetty:run inside the app module.When you navigate to the module with the web app and run mvn jetty:run, Maven will resolve the client and common modules from your workspace, just as you would expect.
  2. Run mvn -f app/pom.xml jetty:run from the project root.In this scenario, Maven too will resolve the client and common modules from your workspace, just as you would expect.

Note that this requires a .mvn folder to be present in the root of your project.This folder does not have to contain any files, as long as it’s there.

Brew

Add --non-recursive option

This option is particularly interesting if your multi-module project is more than one or two levels deep.Take the Quarkus project as an example: each extension has at least two subprojects, deployment and runtime.

Earlier, if you wanted to build only the gRPC module and its five children, you would have needed something like mvn -pl extensions/grpc/codegen,extensions/grpc/deployment - and the list would go on and on…With Maven 4, you can use -pl extensions/grpc and build the grpc module plus all its child-modules in one go.So a “recursive” approach is now the default.If you don’t want this to happen, add --non-recursive to get back the old behaviour.

Detect errorless or warningless builds

But there’s more, not related to the Reactor and multi-module builds!

A warning is an error in the making.
– unknown author

Many tools send warnings to their users to, indeed, warn them about potential problems.Sometimes the developers of the tool use this to introduce stricter checks without breaking every project.So we prefer to have a build that does not contain any warnings - one day, they may become an error.

That’s why we are happy that with Maven 4, you can specify the --fail-on-severity or -fos parameter.By adding -fos WARN, the Maven build will break as soon as Maven itself or any plugin logs a warning message.

Consistent timestamp in multi-module builds

A recent improvement had to deal with a timestamp that Maven uses internally.That timestamp would end up in packaged archives, but in a multi-module build, each module would have a different timestamp.That’s a bit odd, and it can become annoying when determining when a bug was introduced.

Long story short: with Maven 4, all modules in the build have the same timestamp.

Automatic builds on GitHub actions

No matter whether you’re a veteran Maven contributor or somebody who passes by to fix a minor bug, the first thing you want to know is whether you broke something.The usual process was to pull the contribution to the Maven source code repository hosted at the Apache Software Foundation.There, it would be built with Jenkins and tested on various Windows and Linux versions.If you aren’t a Maven contributor yourself, you would need a “committer” on the project to do this for you.In our first experiences, before we became committers ourselves, this process could take a while.

But now, if you submit a pull request on GitHub, you don’t need to wait that long to have feedback.We’ve added GitHub Actions that perform a build and then test your changes in various environments.These provide you with instant feedback on the quality of your contribution - no human work involved.

Laptop

As a bonus, those tests also run on macOS - this even showed a failing test that previously went undercover as it only failed on macOS.

But wait, there’s more!

Stone Brewery Locations

Maven 4 will contain so much more, it’s too much to write in one article.To mention a few other things:

  • Update the default plugin versions for the POM, JAR, EJB, WAR, EAR, RAR and Maven Plugin packaging types.
  • If a downloaded file fails the checksum check, the build will break.This was previously a warning - see why we like -fos?
  • Some of the current warnings will break your build.Again, see why we like -fos?You most like will need to fix your pom for these.
  • Build/consumer implementation, explained in great detail in this video chat.
  • Maven wrapper, just like Gradle has had for quite some time.There used to be a wrapper for a long time, but that was not part of the official Maven distribution.Now it is, and it will continue to be part of Maven.
  • Automatic parent/dependency versioning

The full release notes contain all details, however big or small.

Wrapping up

We are truly happy to see a few major improvements coming with this new Maven release.Both of us have contributed some of them in time that our employer, Info Support, provided us with.We’re grateful for that time and we hope we used it to make Maven an even better tool than it already was.

If you want to give a try and you are working on macOS or Linux, there’s some good news for you.Using Brew, you can install the very latest bits and pieces of Maven 4.0 using this “tap”. Atomic mass of cl in amu.

Your previously installed Maven is not gone if you do this.Using Brew, you can switch back & forth:

Take care though: these are really the latest bits, and they may or may not work.Those builds are not an official distribution of Maven and they are not supported in any way.But of course, they pass the extensive integration test suite.

Please try these builds!We appreciate early feedback on the quality and usability of Maven 4.0.0-alpha-1.You can submit a bug in JIRA (requires login, but you can create one in seconds).

Resources

  • Lightning fast Sass compiling with libsass, Node-sass and Grunt-sass — by Ben Frain, August 2013
  • Node, Express and libSass — Node, Express and libSass: a project from scratch workshop

We want everyone to enjoy Sass, no matter what language they use. Sass was originally written in Ruby. LibSass is a C/C++ port of the Sass engine. The point is to be simple, faster, and easy to integrate. Find out more about the project over at GitHub.

Wrappers

LibSass is just a library. To run the code locally (i.e. to compile your stylesheets), you need an implementer, or 'wrapper'. There are a number of other wrappers for LibSass. We encourage you to write your own wrapper — the whole point of LibSass is that we want to bring Sass to many other languages, not just Ruby!

Below are the LibSass wrappers that we're currently aware of. Sometimes there are multiple wrappers per language – in those cases, we put the most recently-updated wrapper first.

  • Sass C

    SassC (get it?) is a wrapper written in C.

    To run the compiler on your local machine, you need to build SassC. To build SassC, you must have either a local copy of the LibSass source or it must be installed into your system. For development, please use the source version. You must then setup an environment variable pointing to the LibSass folder, for example:

    The executable will be in the bin folder. To run it, try something like:

  • Crystal

    sass.cr is a LibSass wrapper for the Crystal programming language.

  • Go

    go-libsass has the most active GoLang wrapper. gosass is another LibSass wrapper.

    Wellington is an extension to LibSass that adds spriting. It is available on brew: brew install wellington

    C6 is a Sass 3.2 compatible implementation written in pure GoLang that aims to extend Sass. wellington/sass is an in-progress pure Go Sass lexer, parser, and compiler.

  • Java

    There is one Java wrapper — jsass. There is also a plugin for Maven — LibSass Maven plugin.

  • JavaScript

    The sass.js project makes LibSass available as pure JavaScript. There's a way to test it in the browser, too.

  • Lua

    The Lua wrapper is found at lua-sass.

  • .NET

    LibSass Host is updated regularly, and is probably the best bet. There's also libsass-net or NSass, although they haven't been updated in a while.

  • Node

    The node-sass project has proven to be popular, and we've taken it into the main Sass GitHub repo. Check out its package page here, and there's a dedicated twitter account for updates.

  • Perl

    The CSS::Sass project is updated regularly. There's the Text-Sass-XS project, too, although it hasn't been updated in a while.

  • PHP

    The SassPHP project is an updated fork of an older PHP version.

  • Python

    The libsass-python project is updated regularly. There are more details on its own website.

    Three other Python projects, python-scss, pylibsass and SassPython, haven't been updated in a while.

  • Ruby

    LibSass has also been ported back into Ruby for the sassc-ruby project.

  • Rust

    The sass_rs crate is a LibSass wrapper and is updated regularly.

  • Scala

    The only Scala project, Sass-Scala, hasn't been updated in a couple of years.

About LibSass

This project is the brainchild of Hampton Catlin, the original creator of Sass, and is sponsored by Moovweb. Aaron Leung from Moovweb is the primary developer.

Manchester Brewery Nh

  • Current Releases:
  • Dart Sass1.32.11
  • LibSass3.6.4
  • Ruby Sass