Collection<? extends CRL> crls = null;
InputStream is = null;
try {
CertificateFactory cf = CertificateFactory.getInstance("X.509");
is = new FileInputStream(crlFile);
crls = cf.generateCRLs(is);
} catch(IOException iex) {
throw iex;
} catch(CRLException crle) {
throw crle;
} catch(CertificateException ce) {