After applying the following quick fix:
            try {
                t.transform(source, result);
            } finally {
                if (result.getOutputStream() != null)
<quick fix is here>                    result.getOutputStream().close();
            }

the code looks like this:
            try {
                t.transform(source, result);
            }catch (IOException ex) {
    Exceptions.printStackTrace(ex);
}
 finally {
                if (result.getOutputStream() != null)
                    result.getOutputStream().close();
            }
which is wrong because I wanted another try/catch pair *inside* the finally block