final NvdCve12Handler cve12Handler = new NvdCve12Handler();
saxParser.parse(oldVersion, cve12Handler);
final Map<String, List<VulnerableSoftware>> prevVersionVulnMap = cve12Handler.getVulnerabilities();
final NvdCve20Handler cve20Handler = new NvdCve20Handler();
cve20Handler.setCveDB(cveDB);
cve20Handler.setPrevVersionVulnMap(prevVersionVulnMap);
saxParser.parse(file, cve20Handler);
}