runtime/local_jetty12_ee10/src/main/java/com/google/appengine/tools/development/jetty/ee10/JettyContainerService.java [425:462]:
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  protected void startHotDeployScanner() throws Exception {
    String fullScanInterval = System.getProperty("appengine.fullscan.seconds");
    if (fullScanInterval != null) {
      try {
        int interval = Integer.parseInt(fullScanInterval);
        if (interval < 1) {
          log.info("Full scan of the web app for changes is disabled.");
          return;
        }
        log.info("Full scan of the web app in place every " + interval + "s.");
        fullWebAppScanner(interval);
        return;
      } catch (NumberFormatException ex) {
        log.log(Level.WARNING, "appengine.fullscan.seconds property is not an integer:", ex);
        log.log(Level.WARNING, "Using the default scanning method.");
      }
    }
    scanner = new Scanner();
    scanner.setReportExistingFilesOnStartup(false);
    scanner.setScanInterval(SCAN_INTERVAL_SECONDS);
    scanner.setScanDirs(ImmutableList.of(getScanTarget().toPath()));
    scanner.setFilenameFilter(
        new FilenameFilter() {
          @Override
          public boolean accept(File dir, String name) {
            try {
              if (name.equals(getScanTarget().getName())) {
                return true;
              }
              return false;
            } catch (Exception e) {
              return false;
            }
          }
        });
    scanner.addListener(new ScannerListener());
    scanner.start();
  }
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runtime/local_jetty12/src/main/java/com/google/appengine/tools/development/jetty/JettyContainerService.java [417:454]:
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  protected void startHotDeployScanner() throws Exception {
    String fullScanInterval = System.getProperty("appengine.fullscan.seconds");
    if (fullScanInterval != null) {
      try {
        int interval = Integer.parseInt(fullScanInterval);
        if (interval < 1) {
          log.info("Full scan of the web app for changes is disabled.");
          return;
        }
        log.info("Full scan of the web app in place every " + interval + "s.");
        fullWebAppScanner(interval);
        return;
      } catch (NumberFormatException ex) {
        log.log(Level.WARNING, "appengine.fullscan.seconds property is not an integer:", ex);
        log.log(Level.WARNING, "Using the default scanning method.");
      }
    }
    scanner = new Scanner();
    scanner.setReportExistingFilesOnStartup(false);
    scanner.setScanInterval(SCAN_INTERVAL_SECONDS);
    scanner.setScanDirs(ImmutableList.of(getScanTarget().toPath()));
    scanner.setFilenameFilter(
        new FilenameFilter() {
          @Override
          public boolean accept(File dir, String name) {
            try {
              if (name.equals(getScanTarget().getName())) {
                return true;
              }
              return false;
            } catch (Exception e) {
              return false;
            }
          }
        });
    scanner.addListener(new ScannerListener());
    scanner.start();
  }
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