Maxmind DatabaseReader Java堆空间

Question

我尝试在spring boot中使用GeoLite2-City.mmdb来获取位置数据。为此，我在配置文件中创建了一个类似以下内容的bean：

        @Bean   
        public static synchronized DatabaseReader mmdbReader() throws IOException { 

               if ( reader != null ) {
                   return reader;
               }

                ResourceLoader resourceLoader = new DefaultResourceLoader();

                Resource resource = resourceLoader.getResource("classpath:static/mmdb/GeoLite2-City.mmdb");
                InputStream database = resource.getInputStream();

               reader = new DatabaseReader.Builder(database).fileMode(com.maxmind.db.Reader.FileMode.MEMORY)
                       .withCache(new CHMCache()).build(); 

           return reader;
        }

我还创建了一个util函数来检索位置，如下所示：

     public static GeoLocation getLocation(HttpServletRequest request, DatabaseReader databaseReader) throws IOException, GeoIp2Exception{

      if(request.getRemoteAddr().equals("0:0:0:0:0:0:0:1") || request.getRemoteAddr().equals("127.0.0.1")) {
          return new GeoLocation("localhost", "Redmond", "USA", 47.673988, -122.121513);
      }

      InetAddress ipAddress = InetAddress.getByName(request.getRemoteAddr());

      CityResponse response = databaseReader.city(ipAddress);

      Country country = response.getCountry();
      City city = response.getCity();
      Location location = response.getLocation();

      return new GeoLocation(ipAddress.toString(), city.getName(), country.getName(), location.getLatitude(), location.getLongitude());
      }

但是，每次我部署应用程序时，我都会收到这个错误

 Caused by: java.lang.OutOfMemoryError: Java heap space
    at java.util.Arrays.copyOf(Arrays.java:3236)
    at java.io.ByteArrayOutputStream.grow(ByteArrayOutputStream.java:118)
    at java.io.ByteArrayOutputStream.ensureCapacity(ByteArrayOutputStream.java:93)
    at java.io.ByteArrayOutputStream.write(ByteArrayOutputStream.java:153)
    at com.maxmind.db.BufferHolder.<init>(BufferHolder.java:64)
    at com.maxmind.db.Reader.<init>(Reader.java:89)
    at com.maxmind.geoip2.DatabaseReader.<init>(DatabaseReader.java:64)
    at com.maxmind.geoip2.DatabaseReader.<init>(DatabaseReader.java:54)

    at com.maxmind.geoip2.DatabaseReader$Builder.build(DatabaseReader.java:160)
    at com.microsoft.apie.configuration.ApplicationConfiguration.mmdbReader(ApplicationConfiguration.java:104)

我的java设置是：

  -Xms512m -Xmx2048m

你能帮个忙吗？

Answer 1

我通过这样做解决了这个问题：

a.我从jar中删除了GeoLite2-City.mmdb文件，并将其放在与jar相同的文件夹中

b.我重构了方法，并这样做：

    @Bean  
    public static synchronized DatabaseReader mmdbReader() throws IOException { 

              if ( reader != null ) {
                  return reader;
              }

               /*ResourceLoader resourceLoader = new DefaultResourceLoader();

               Resource resource = resourceLoader.getResource("classpath:static/mmdb/GeoLite2-Country.mmdb");

               InputStream database = resource.getInputStream();
              */
               FileSystemResource resource = new FileSystemResource("/path/to/file/GeoLite2-City.mmdb");

              reader = new DatabaseReader.Builder(resource.getFile()).fileMode(com.maxmind.db.Reader.FileMode.MEMORY_MAPPED)
                      .withCache(new CHMCache()).build(); 

          return reader;
   }

c.重新打包应用程序，它可以正常工作！

感谢Strelok的建议