code: public TLSARecord getTLSARecord(URL url) {
  
          String recordValue;
  
          int port = url.getPort();
          if (port == -1) {
              port = url.getDefaultPort();
          }
          String tlsaRecordName = String.format("_%s._tcp.%s", port, DNSUtil.ensureDot(url.getHost()));
          try {
              recordValue = this.dnssecResolver.resolve(tlsaRecordName, Type.TLSA);
          } catch (DNSSECException e) {
              return null;
          }
  
          if (recordValue.equals("")) return null;
  
          // Process TLSA Record
          String[] tlsaValues = recordValue.split(" ");
          if (tlsaValues.length != 4) return null;
          try {
              return new TLSARecord(
                      new Name(tlsaRecordName),
                      DClass.IN,
                      0,
                      Integer.parseInt(tlsaValues[0]),
                      Integer.parseInt(tlsaValues[1]),
                      Integer.parseInt(tlsaValues[2]),
                      BaseEncoding.base16().decode(tlsaValues[3])
              );
          } catch (TextParseException e) {
              return null;
          }
      }
docs: Handle DNSSEC resolution for the URL's associated TLSA record
  
  @param url URL to get TLSA record for
  @return TLSARecord is it exists or null