Maven 3 can resolve artifacts to the project.build.outputDirectory, causing an IOException

I'm not sure if this plugin is intended to support Maven 3 or not, but if so, it needs to account for the case in Maven 3 where a call to ArtifactResolver.resolve() can return a build output directory in the current project in the case of a multimodule build. With Maven 3.0.2, I'm getting this exception when I try to run the jnlp-download-servlet goal without having run at least the package phase (because if I run package, then the built JAR is used as the artifact, but if not, it uses the build output directory):

[ERROR] Failed to execute goal org.codehaus.mojo.webstart:webstart-maven-plugin:1.0-beta-1:jnlp-download-servlet (default) on project foo: Unable to copy an artifact to the working directory: <module directory>/target/classes (Is a directory) -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.codehaus.mojo.webstart:webstart-maven-plugin:1.0-beta-1:jnlp-download-servlet (default) on project foo: Unable to copy an artifact to the working directory
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:217)
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:319)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:534)
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:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
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)
Caused by: org.apache.maven.plugin.MojoExecutionException: Unable to copy an artifact to the working directory
at org.codehaus.mojo.webstart.JnlpDownloadServletMojo.retrieveJarResources(JnlpDownloadServletMojo.java:454)
at org.codehaus.mojo.webstart.JnlpDownloadServletMojo.execute(JnlpDownloadServletMojo.java:136)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:107)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
... 19 more
Caused by: java.io.FileNotFoundException: <module dir>/target/classes (Is a directory)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(FileInputStream.java:106)
at org.codehaus.plexus.util.FileUtils.copyFile(FileUtils.java:950)
at org.codehaus.mojo.webstart.AbstractBaseJnlpMojo.copyJarAsUnprocessedToDirectoryIfNecessary(AbstractBaseJnlpMojo.java:569)
at org.codehaus.mojo.webstart.JnlpDownloadServletMojo.retrieveJarResources(JnlpDownloadServletMojo.java:423)
... 22 more