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(Quick Reference) # 5.7.2 Dependency Repositories - Reference Documentation Authors: Graeme Rocher, Peter Ledbrook, Marc Palmer, Jeff Brown, Luke Daley, Burt Beckwith, Lari Hotari Version: 2.4.3 ## 5.7.2 Dependency Repositories #### Remote Repositories Initially your BuildConfig.groovy does not use any remote public Maven repositories. There is a default `grailsHome()` repository that will locate the JAR files Grails needs from your Grails installation. To use a public repository, specify it in the `repositories` block:
    repositories {
        mavenCentral()
    }
In this case the default public Maven repository is specified. You can also specify a specific Maven repository to use by URL:
    repositories {
        mavenRepo "http://repository.codehaus.org"
    }
and even give it a name:
    repositories {
        mavenRepo name: "Codehaus", root: "http://repository.codehaus.org"
    }
so that you can easily identify it in logs. #### Offline Mode There are times when it is not desirable to connect to any remote repositories (whilst working on the train for example!). In this case you can use the `offline` flag to execute Grails commands and Grails will not connect to any remote repositories:
    grails --offline run-app
Note that this command will fail if you do not have the necessary dependencies in your local Maven cache You can also globally configure offline mode by setting `grails.offline.mode` to `true` in `~/.grails/settings.groovy` or in your project's `BuildConfig.groovy` file:
    grails.offline.mode=true
To specify your local Maven cache (`~/.m2/repository`) as a repository:
    repositories {
        mavenLocal()
    }
#### Authentication with Aether To authenticate with Aether you can either define the credentials on the repository definition:
    mavenRepo(url:"http://localhost:8082/myrepo") {
        auth username: "foo", password: "bar"
    }
Or you can specify an `id` on the repository:
    mavenRepo(id:'myrepo', url:"http://localhost:8082/myrepo")
And then declare your credentials in `USER_HOME/.grails/settings.groovy`:
    grails.project.dependency.authentication = {
        credentials {
            id = "myrepo"
            username = "admin"
            password = "password"
        }
    }
#### Authentication with Ivy If your repository requires authentication you can configure this using a `credentials` block:
    credentials {
        realm = ".."
        host = "localhost"
        username = "myuser"
        password = "mypass"
    }
This can be placed in your `USER_HOME/.grails/settings.groovy` file using the `grails.project.ivy.authentication` setting:
    grails.project.ivy.authentication = {
        credentials {
            realm = ".."
            host = "localhost"
            username = "myuser"
            password = "mypass"
        }
    }
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