Fixed multi-threading issue

Author: ip2location-com

com/ip2location/Country.java

@@ -17,7 +17,7 @@
  * <p>
  *
  * @author IP2Location.com
- * @version 8.12.1
+ * @version 8.12.2
  */
 public class Country {
     private final Map<String, Map<String, String>> records = new HashMap<>();

com/ip2location/IP2Location.java

@@ -34,7 +34,7 @@
  * <p>
  *
  * @author IP2Location.com
- * @version 8.12.1
+ * @version 8.12.2
  */
 public class IP2Location {
     private static final Pattern pattern = Pattern.compile("^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$"); // IPv4
@@ -305,7 +305,7 @@ private void DestroyMappedBytes() {
         _MapDataBuffer = null;
     }
 
-    private void CreateMappedBytes() throws IOException {
+    private synchronized void CreateMappedBytes() throws IOException {
         try (RandomAccessFile aFile = new RandomAccessFile(IPDatabasePath, "r")) {
             final FileChannel inChannel = aFile.getChannel();
             CreateMappedBytes(inChannel);

com/ip2location/IP2LocationWebService.java

@@ -26,7 +26,7 @@
  * <p>
  *
  * @author IP2Location.com
- * @version 8.12.1
+ * @version 8.12.2
  */
 public class IP2LocationWebService {
     private static final Pattern pattern = Pattern.compile("^[\\dA-Z]{10}$");

com/ip2location/IPResult.java

@@ -7,7 +7,7 @@
  * <p>
  *
  * @author IP2Location.com
- * @version 8.12.1
+ * @version 8.12.2
  */
 public class IPResult {
     static final String NOT_SUPPORTED = "Not_Supported";
@@ -39,7 +39,7 @@ public class IPResult {
     String as;
     String status;
     boolean delay = false;
-    String version = "Version 8.12.1";
+    String version = "Version 8.12.2";
 
     IPResult(String ipstring) {
         ip_address = ipstring;

com/ip2location/IPTools.java

@@ -34,7 +34,7 @@
  * <p>
  *
  * @author IP2Location.com
- * @version 8.12.1
+ * @version 8.12.2
  */
 public class IPTools {
     private static final BigInteger MAX_IPV4_RANGE = new BigInteger("4294967295");

com/ip2location/Region.java

@@ -18,7 +18,7 @@
  * <p>
  *
  * @author IP2Location.com
- * @version 8.12.1
+ * @version 8.12.2
  */
 public class Region {
     private final Map<String, List<Map<String, String>>> records = new HashMap<>();