MyLookupServiceImpl.java

public class MyLookupServiceImpl implements ApplicationContextAware {
  private com.maxmind.geoip.LookupService lookupService;
  private String dataPath; // classpath location of .dat file, e.g GeoIPCity.dat
  
  private ApplicationContext context;
  
  // constructor that allows us to inject a LookupService, e.g. for testing
  public MyLookupServiceImpl(com.maxmind.geoip.LookupService lookupService) {
    this.lookupService = lookupService;
  }
  
  ...
  
  public void setApplicationContext(ApplicationContext applicationContext) {
        this.context = applicationContext;
        
        if (this.lookupService == null) {
            if (this.dataPath == null) { LOG.warn("dataPath not set."); return; }
            final Resource resource = this.context.getResource("classpath:" + this.dataPath);
            if (resource != null) {
                try {
                    final File f = resource.getFile();
                    // instantiate MaxMind LookupService
                    this.lookupService = new com.maxmind.geoip.LookupService(f, com.maxmind.geoip.LookupService.GEOIP_MEMORY_CACHE);
                } catch (Exception e) {
                    LOG.error(String.format("Could not create service. %s", e.getMessage()), e);
                }
            } else {
                LOG.warn(String.format("Could not find classpath resource: [%s]. ", path));
            }
        }
  }
  ...
}