List all of the possible goals in Maven 2?

Question

I'm a newbie to Maven, coming from the Ant world.

Is it possible to list all of the possible goals (including, say, all the plugins) that it is possible to run?

I can see that there used to be a -g flag in Maven 1, but this isn't available in version 2.

Answer 1

The goal you indicate in the command line is linked to the lifecycle of Maven. For example, the build lifecycle (you also have the clean and site lifecycles which are differents) is composed of the following phases:

• validate: validate the project is correct and all necessary information is available.
• compile: compile the source code of the project.
• test: test the compiled source code using a suitable unit testing framework. These tests should not require the code be packaged or deployed.
• package: take the compiled code and package it in its distributable format, such as a JAR.
• integration-test: process and deploy the package if necessary into an environment where integration tests can be run.
• verify: run any checks to verify the package is valid and meets quality criteria
• install: install the package into the local repository, for use as a dependency in other projects locally.
• deploy: done in an integration or release environment, copies the final package to the remote repository for sharing with other developers and projects.

You can find the list of "core" plugins here, but there are plenty of others plugins, such as the codehaus ones, here.

Answer 2

Is it possible to list all of the possible goals (including, say, all the plugins) that it is possible to run?

Maven doesn't have anything built-in for that, although the list of phases is finite (the list of plugin goals isn't since the list of plugins isn't).

But you can make things easier and leverage the power of bash completion (using cygwin if you're under Windows) as described in the Guide to Maven 2.x auto completion using BASH (but before to choose the script from this guide, read further).

To get things working, first follow this guide to setup bash completion on your computer. Then, it's time to get a script for Maven2 and:

• While you could use the one from the mini guide
• While you use an improved version attached to MNG-3928
• While you could use a random scripts found around the net (see the resources if you're curious)
• I personally use the Bash Completion script from Ludovic Claude's PPA (which is bundled into the packaged version of maven in Ubuntu) that you can download from the HEAD. It's simply the best one.

Below, here is what I get just to illustrate the result:

$ mvn [tab][tab]
Display all 377 possibilities? (y or n)
ant:ant 
ant:clean 
ant:help 
antrun:help 
antrun:run 
archetype:crawl 
archetype:create 
archetype:create-from-project 
archetype:generate 
archetype:help 
assembly:assembly 
assembly:directory 
assembly:directory-single 
assembly:help 
assembly:single  
... 

Of course, I never browse the 377 possibilities, I use completion. But this gives you an idea about the size of "a" list :)

Resources

• Guide to Maven 2.x auto completion using BASH
• Fixing Maven 2.x BASH auto completion on CYGWIN
• Maven bash completion
• maven2 bash completion complete
• Maven Tab Auto Completion in Bash
• Advanced Bash completion script for Maven 2