java docs

Author: hoangtien2k3

src/main/java/io/hoangtien2k3/commons/factory/ModelMapperFactory.java

@@ -17,7 +17,7 @@
 import org.modelmapper.ModelMapper;
 
 public class ModelMapperFactory {
-  private static ModelMapper modelMapper = new ModelMapper();
+  private static final ModelMapper modelMapper = new ModelMapper();
 
   public static ModelMapper getInstance() {
     return modelMapper;