code: protected void validate(X509Certificate [] certPath)
      throws ProxyPathValidatorException {
      validate(certPath,
           (TrustedCertificates)null,
           (CertificateRevocationLists)null);
      }
docs: Performs certificate path validation. Does <B>not</B> check
  the cert signatures but it performs all other checks like
  the extension checking, validity checking, restricted policy
  checking, CRL checking, etc.
  
  @param certPath the certificate path to validate.
  @exception ProxyPathValidatorException if certificate
  path validation fails.