Main.java

import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.List;
import java.util.Map;

import com.google.gson.Gson;
import com.google.gson.annotations.SerializedName;

public class Main {

    static final String JSON =
        "{\n"
        + "    asset: \n"
        + "        {\n"
        + "            'name': name,\n"
        + "            'desc': {\n"
        + "                'country': country,\n"
        + "                'city': city,\n"
        + "                'postal': postal,\n"
        + "                'street': street,\n"
        + "                'substreet': substreet,\n"
        + "                'year': year,\n"
        + "                'sqm': sqm\n"
        + "            },\n"
        + "            'owner': [owner],\n"
        + "            'manager': [manager],\n"
        + "            'lease': {\n"
        + "                'leasee': [\n"
        + "                    {\n"
        + "                        'userId': leaseeId,\n"
        + "                        'start': leaseeStart,\n"
        + "                        'end': leaseeeEnd\n"
        + "                    }\n"
        + "                ],\n"
        + "                'expire': leaseExpire,\n"
        + "                'percentIncrease': leasePercentIncrease,\n"
        + "                'dueDate': dueDate\n"
        + "            },\n"
        + "            'deposit': {\n"
        + "                'bank': 'Sample Bank',\n"
        + "                'description': 'This is a bank'\n"
        + "            }\n"
        + "        }\n"
        + "}\n"
        ;

    public static void main(String[] args) throws FileNotFoundException, IOException {
        Gson gson = new Gson();
        Root root = (Root)gson.fromJson(JSON, Root.class);
        System.out.println(root);
        String s = gson.toJson(root);
        System.out.println(s);
    }

    static class Root {
        private Asset asset;
    }

    static class Asset {

        public String mId;

        @SerializedName("name")
        public String mName;

        @SerializedName("desc")
        public Map<String, Object> mDesc;

        public String mCountry;

        public String mCity;

        public String mPostal;

        public String mStreet;

        public String mSubstreet;

        public int mYear;

        public int mSqm;

        @SerializedName("owner")
        public List<String> mOwners;

        @SerializedName("manager")
        public List<String> mManagers;

        public int mPercentIncrease;

        public int mDueDate;

        public String mDepositBank;

        public String mDepositDescription;
        }
}