[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building jgit-clean-bug 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- exec-maven-plugin:1.4.0:java (default-cli) @ jgit-clean-bug ---
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
[WARNING]
java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:293)
	at java.lang.Thread.run(Thread.java:745)
Caused by: org.eclipse.jgit.api.errors.JGitInternalException: Could not delete file /Users/matthaus/src/jgit-clean-bug/target/repos/outer-repo/inner-repo
	at org.eclipse.jgit.api.CleanCommand.call(CleanCommand.java:138)
	at jgitcleanbug.JgitCleanBug.cleanRepo(JgitCleanBug.java:28)
	at jgitcleanbug.JgitCleanBug.main(JgitCleanBug.java:50)
	... 6 more
Caused by: java.io.IOException: Could not delete file /Users/matthaus/src/jgit-clean-bug/target/repos/outer-repo/inner-repo
	at org.eclipse.jgit.util.FileUtils.delete(FileUtils.java:197)
	at org.eclipse.jgit.util.FileUtils.delete(FileUtils.java:125)
	at org.eclipse.jgit.api.CleanCommand.call(CleanCommand.java:125)
	... 8 more
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.696 s
[INFO] Finished at: 2016-07-22T10:29:48-07:00
[INFO] Final Memory: 11M/309M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.4.0:java (default-cli) on project jgit-clean-bug: An exception occured while executing the Java class. null: InvocationTargetException: Could not delete file /Users/matthaus/src/jgit-clean-bug/target/repos/outer-repo/inner-repo -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException