Starting Jenkins via the war file and supplying a path as argument for the application, causes an exception and recursively deletes all files from the current folder.

Steps:
1. Download the jenkins.war file from https://jenkins-ci.org/
2. Start jenkins via: 'java -jar jenkins.war ./'
3. Stop the application with Ctrl+C

After step 3 check the current folder and notice that all files and sub folders have been deleted.

The exception I get is:

$ java -jar jenkins.war ./
Running from: /Volumes/data/jenkins/jenkins.war
webroot: $user.home/.jenkins
[Winstone 2011/12/07 17:09:05] - Beginning extraction from war file
[Winstone 2011/12/07 17:09:05] - Error initializing web application: prefix []
java.util.zip.ZipException: error in opening zip file
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java:127)
at java.util.jar.JarFile.<init>(JarFile.java:135)
at java.util.jar.JarFile.<init>(JarFile.java:99)
at winstone.HostConfiguration.getWebRoot(HostConfiguration.java:253)
at winstone.HostConfiguration.<init>(HostConfiguration.java:73)
at winstone.HostGroup.initHost(HostGroup.java:85)
at winstone.HostGroup.<init>(HostGroup.java:45)
at winstone.Launcher.<init>(Launcher.java:197)
at winstone.Launcher.main(Launcher.java:398)
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 Main._main(Main.java:268)
at Main.main(Main.java:96)

[Winstone 2011/12/07 17:09:05] - HTTP Listener started: port=8080
[Winstone 2011/12/07 17:09:05] - AJP13 Listener started: port=8009
[Winstone 2011/12/07 17:09:05] - Winstone Servlet Engine v0.9.10 running: controlPort=disabled

Whatever argument is specified it has to be handled gracefully and should not result in deleting whole folders on disk. I think that's a critical issue and that I was lucky to run the war file from a newly created 'jenkins' sub folder. Otherwise I would have wiped out my whole data partition.