DateFormat throws exception if used by multiple threads concurrently

XStream should be thread safe, but some of the converters use DateFormat.. which isn't.

Here's something that exposes it....

final DateFormat df = new SimpleDateFormat("yyyy-MM-dd kk:mm:ss.sss");

Runnable r = new Runnable() {
public void run() {
for (int i = 0; i < 100; i++) {
try

{ df.parse("2004-05-05 17:40:23.126"); }

catch (ParseException e)

{ e.printStackTrace(); }

//Object o = xStreamMarshaller.unmarshal(s);
}
System.out.println("done");
}
};

for(int i = 0; i < 100; i++)

{ new Thread(r).start(); }