The Slide WebDAV client, specifically class WebdavResource, opens input streams 
but doesn't close them. This results in errors if many files are consecutively 
copied with putMethod(). If input streams are not closed, the system resources 
will be freed only at garbage collection time.

I would suggest to change WebdavResource as follows.

Instead of doing 
	method.setRequestBody(new FileInputStream(file));

do

	FileInputStream fin=new FileInputStream(file);
	method.setRequestBody(fin);
	fin.close();

Example stack trace after copying multiple files:

java.io.FileNotFoundException: 
(Insufficient system resources exist to complete the requested service)
	at java.io.FileInputStream.open(Native Method)
	at java.io.FileInputStream.<init>(Unknown Source)
	at org.apache.webdav.lib.WebdavResource.putMethod
(WebdavResource.java:2553)