Some jar file was opened on Windows host by java.util.jar.JarFile(..) (or java.util.zip.ZipFile(..)) with OPEN_DELETE flag. According to the specification it should be removed. But if the jarFile is located on the Mapped Network Drive (from some Solaris host with Samba) it will not be removed. In that time it will be removed if the test's work dir is some local directory.
Specification doesn't contains any restrictions for mapped network drives via Samba.