at java.io.FileInputStream.<init>(FileInputStream.java:121)
	at java.io.FileInputStream.<init>(FileInputStream.java:79)
	at sun.net.www.protocol.file.FileURLConnection.connect(FileURLConnection.java:70)
	at sun.net.www.protocol.file.FileURLConnection.initializeHeaders(FileURLConnection.java:90)
	at sun.net.www.protocol.file.FileURLConnection.getHeaderField(FileURLConnection.java:126)
	at sun.net.www.protocol.jar.JarURLConnection.getHeaderField(JarURLConnection.java:203)
	at java.net.URLConnection.getHeaderFieldDate(URLConnection.java:603)
	at java.net.URLConnection.getLastModified(URLConnection.java:532)
	at org.kohsuke.stapler.Stapler.serveStaticResource(Stapler.java:241)
	at org.kohsuke.stapler.Stapler.serveStaticResource(Stapler.java:252)
	at org.kohsuke.stapler.ResponseImpl.serveFile(ResponseImpl.java:132)
	at org.kohsuke.stapler.framework.adjunct.AdjunctManager.doDynamic(AdjunctManager.java:129)
	at sun.reflect.GeneratedMethodAccessor276.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)