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grails-app/conf The user can now specify the credentials for portals in the configura… Mar 1, 2011
MavenPublisherGrailsPlugin.groovy Grails version for the plugin is now 1.3.6. Mar 1, 2011

Maven Publisher Plugin

This plugin enables you to publish application WAR files and plugin packages (zip files) to a Maven-compatible repository. It can also install them to your local Maven cache.

As of version 0.7 you can publish your plugins to both Maven-compatible and Subversion repositories.


Use either the command:

grails install-plugin maven-publisher

or add this dependency to BuildConfig.groovy (Grails 1.3+ only):

build ":maven-publisher:0.6"

Don't forget to specify the version you want in the latter example (0.6 may not be the latest when you read this).


The plugin provides two commands:

grails maven-install
grails maven-deploy

The first of these commands installs the WAR or zip (depending on the type of your project) to your local Maven cache. The second one deploys the package to a remote Maven-compatible repository.

Configuration comes in the form of a grails.project.dependency.distribution setting in BuildConfig.groovy, which allows you to define multiple repositories identified by name and the location of the local Maven cache. Let's take a look at an example:

grails.project.dependency.distribution = {
    localRepository = "/path/to/local/cache"

    remoteRepository(id: "snapshots", url: "http://myserver:8081/artifactory/libs-snapshots-local")

    remoteRepository(id: "releases", url: "http://myserver:8081/artifactory/libs-releases-local") {
        authentication username: "admin", password: "password"

As you can probably gather, you can change the path for the local Maven cache by setting localRepository to a local file path. The syntax for configuring remote repositories is different, but it's fairly self-explanatory. In this example, we set up two repositories called "snapshots" and "releases" respectively. In many cases you just need to specify the URL of the repository, but if the repository requires authentication, you can use the syntax shown in the second remote repository definition.

The maven-install command takes no arguments, but with maven-deploy, you need to tell it which repository to publish your artifact to. This is done with a --repository argument that you set to the name of the repository you want:

grails maven-deploy --repository=releases

The name of the repository on the command line must match one of the IDs in the remote repository definitions in BuildConfig.groovy.

New to 0.7

Version 0.7 of the plugin introduces some new commands. The first of these,

grails generate-pom

will generate a pom.xml file for the current project. This is the same one as generated when you execute maven-deploy, but now it can include extra information such as who the developers are and how to access both issue tracking and source control. Where does this information come from? It's only supported by plugins at the moment as it is extracted from properties of the plugin descriptor. The supported properties, with example values, are:

def license = "APACHE"
def organization = [ name: "SpringSource", url: "" ]
def developers = [
        [ name: "Peter Ledbrook", email: "" ],
        [ name: "Graeme Rocher", email: "" ] ]
def issueManagement = [ system: "JIRA", url: "" ]
def scm = [ url: "" ]

The names of the properties and the keys used in the maps match the element names used in the POM.

The other new command is

grails publish-plugin [--dry-run] [--snapshot] [--repository=repoId] [--protocol=protocol] [--portal=portal] [--pingOnly]

which is dedicated to publishing plugins. Although the arguments are very similar to the ones used by the maven-deploy command, publish-plugin will also deploy to Subversion repositories just like the existing release-plugin command.

If you don't provide any arguments at all, the command will publish your plugin to the Grails Central repository. Otherwise, it will use the repository with the given ID. You can define repositories in the same way as you do for maven-deploy, but there are a couple of extra options.

First, you can use an old style repository definition:

grails.plugin.repos.distribution.<repoId> = ""

Note that in this case, any authentication credentials are included in the URL itself. The second option is a type argument to the newer repository definition syntax, like so:

grails.project.dependency.distribution = {
    remoteRepository(id: "myRepo", type: "svn", url: "")

Again, the credentials must be included in the URL. Also, you can specify a type of "maven" if you want to be explicit, but you don't have to since it's the default for this syntax.

The plugin can notify any portal of the plugin release, although it defaults to the main portal on You can define alternative portals using a similar syntax to remote repositories:

grails.project.dependency.distribution = {
    portal id: "beta", url: ""

--dry-run will simply print out what files will be deployed. It won't actually perform the deployment.

--snapshot forces the command to treat the plugin as a snapshot version. In other words, it will not be marked as the latest release. This currently only affects deployments to Subversion repositories. By default, plugins are treated as release versions unless their version number has a '-SNAPSHOT' suffix.

--repository specifies which Subversion or Maven-compatible repository the plugin should be deployed to. A remote repository must first be defined with that ID in BuildConfig.groovy.

--protocol specifies the protocol to use when deploying the plugin to a Maven-compatible repository. Can be one of 'http', 'scp', 'scpexe', 'ftp', or 'webdav'. The default is 'http'.

--portal specifies the ID of the portal to notify. For this to work, a portal must be configured for that ID in BuildConfig.groovy.

--pingOnly (version 0.7.3+) forces the command to only notify the configured portal - the plugin is not published to a repository.

One final note: publish-plugin does not automatically commit source code changes to a Subversion repository. It's the equivalent of release-plugin --zipOnly.

New to 0.8

It's now possible to configure repositories and portals using standard config syntax by adding entries under grails.project.repos.<repoId>. For example to configure a repository with the ID 'myRepo', simply add the setting

grails.project.repos.myRepo.url = ""

It's not just the URL you can set either. It's possible to specify the type of the repository ("maven" or "svn"), the default portal to notify, and the credentials to use when connecting:

grails.project.repos.myRepo.url = ""
grails.project.repos.myRepo.type = "maven"
grails.project.repos.myRepo.portal = "companyLocal"
grails.project.repos.myRepo.username = "admin"
grails.project.repos.myRepo.password = "password"

The big advantage of this approach is that you can selectively override parts of the configuration (such as the portal) and also put credentials in your local $HOME/.grails/settings.groovy file. So no more typing the username and password every time you publish a plugin!

You can even specify credentials for the Grails Central Plugin Repository:

grails.project.repos.grailsCentral.username = "..."
grails.project.repos.grailsCentral.password = "..."

In other words, there is an implicit repository called 'grailsCentral' that you can configure. Of course, this means you cannot define your own 'grailsCentral' repository.

A similar syntax allows you to configure portals, except in this case the root config element is grails.project.portal.<portalId>. Again, you can specify the URL of the portal and the credentials required to access it:

grails.project.portal.myPortal.url = ""
grails.project.portal.myPortal.username = "admin"
grails.project.portal.myPortal.password = "password"

If you want to configure your credentials for the plugin portal, you can do that too:

grails.project.portal.grailsCentral.username = "..."
grails.project.portal.grailsCentral.password = "..."

As you can see, the ID of the portal is 'grailsCentral', just like for the Grails Central Plugin Repository. You can use this ID when specifying the default portal for a repository.

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