I don't know what the correct fix is. The quickfix is to skip folders, but I
guess the correct fix would be to find a way to archive folders as well.

This can happen for example when the assembly plugin is used to produce an
exploded zip (i.e. a folder):

[INFO] ------------------------------------------------------------------------
[ERROR] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] /xxx/yyy/bbb/thing-1.0-SNAPSHOT.dir (Is a directory)
[INFO] ------------------------------------------------------------------------
[INFO] Trace
org.apache.maven.BuildFailureException: /xxx/yyy/bbb/thing-1.0-SNAPSHOT.dir (Is
a directory)
at
org.apache.maven.lifecycle.LifecycleExecutorInterceptor.execute(LifecycleExecutorInterceptor.java:50)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:334)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:125)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:280)
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.classworlds.Launcher.launchEnhanced(Launcher.java:315)
at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
at hudson.maven.agent.Main.launch(Main.java:133)
at hudson.maven.MavenBuilder.call(MavenBuilder.java:129)
at hudson.maven.MavenModuleSetBuild$Builder.call(MavenModuleSetBuild.java:528)
at hudson.maven.MavenModuleSetBuild$Builder.call(MavenModuleSetBuild.java:474)
at hudson.remoting.UserRequest.perform(UserRequest.java:69)
at hudson.remoting.UserRequest.perform(UserRequest.java:23)
at hudson.remoting.Request$2.run(Request.java:206)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.io.FileNotFoundException: /xxx/yyy/bbb/thing-1.0-SNAPSHOT.dir
(Is a directory)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(FileInputStream.java:106)
at hudson.FilePath$21.invoke(FilePath.java:738)
at hudson.FilePath$21.invoke(FilePath.java:736)
at hudson.FilePath.act(FilePath.java:315)
at hudson.FilePath.copyTo(FilePath.java:736)
at hudson.FilePath.copyTo(FilePath.java:724)
at
hudson.maven.reporters.MavenArtifactArchiver.postBuild(MavenArtifactArchiver.java:123)
at
hudson.maven.MavenModuleSetBuild$Builder.postModule(MavenModuleSetBuild.java:561)
at hudson.maven.MavenBuilder$Adapter.fireLeaveModule(MavenBuilder.java:261)
at hudson.maven.MavenBuilder$Adapter.postBuild(MavenBuilder.java:225)
at
org.apache.maven.lifecycle.LifecycleExecutorInterceptor.execute(LifecycleExecutorInterceptor.java:45)
... 22 more