How do you specify relative local files?

[Sebastien Diot]

The example in the wiki only shows an absolute path for a local file. How do you specify a relative path, to where Maven is running?

Something like:

<downloadUrl>
file://./lib/{groupId}/{artifactId}.jar
</downloadUrl>

Gives me this error:

[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building jMonkeyEngine3 jme3-3.0rc2
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-external-dependency-plugin:0.5:resolve-external (default-cli) @ jMonkeyEngine3 ---
[INFO] starting to resolve external dependencies
[INFO] attempting to resolve external artifact: android:android:0.0.1-SNAPSHOT:jar
[INFO] downloading artifact from URL: file://./lib/android/android.jar
[ERROR]
java.net.UnknownHostException: .
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:178)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:157)
        at java.net.Socket.connect(Socket.java:579)
        at java.net.Socket.connect(Socket.java:528)
        at sun.net.ftp.impl.FtpClient.doConnect(FtpClient.java:943)
        at sun.net.ftp.impl.FtpClient.tryConnect(FtpClient.java:903)
        at sun.net.ftp.impl.FtpClient.connect(FtpClient.java:998)
        at sun.net.ftp.impl.FtpClient.connect(FtpClient.java:984)
        at sun.net.www.protocol.ftp.FtpURLConnection.connect(FtpURLConnection.java:294)
        at sun.net.www.protocol.ftp.FtpURLConnection.getInputStream(FtpURLConnection.java:393)
        at java.net.URL.openStream(URL.java:1037)
        at org.codehaus.plexus.util.io.URLInputStreamFacade.getInputStream(URLInputStreamFacade.java:77)
        at org.codehaus.plexus.util.FileUtils.copyStreamToFile(FileUtils.java:1057)
        at org.codehaus.plexus.util.FileUtils.copyURLToFile(FileUtils.java:1018)
        at com.savage7.maven.plugin.dependency.ResolveExternalDependencyMojo.execute(ResolveExternalDependencyMojo.java:155)
        at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:601)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
        at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
        at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)