Merge pull request binance-exchange#21 from xezon/warnings

Fix Java compile warnings.

Author: joaopsilva

src/main/java/com/binance/api/client/BinanceApiRestClient.java

@@ -20,7 +20,6 @@
 import com.binance.api.client.domain.market.OrderBook;
 import com.binance.api.client.domain.market.TickerPrice;
 import com.binance.api.client.domain.market.TickerStatistics;
-import retrofit2.Call;
 
 import java.util.List;
 

src/main/java/com/binance/api/client/BinanceApiWebSocketClient.java

@@ -4,7 +4,6 @@
 import com.binance.api.client.domain.event.CandlestickEvent;
 import com.binance.api.client.domain.event.DepthEvent;
 import com.binance.api.client.domain.event.UserDataUpdateEvent;
-import com.binance.api.client.domain.market.Candlestick;
 import com.binance.api.client.domain.market.CandlestickInterval;
 
 /**

src/main/java/com/binance/api/client/domain/account/NewOrder.java

@@ -7,8 +7,6 @@
 import org.apache.commons.lang3.builder.ToStringBuilder;
 import org.apache.commons.lang3.builder.ToStringStyle;
 
-import java.math.BigDecimal;
-
 /**
  * A trade order to enter or exit a position.
  */

src/main/java/com/binance/api/client/domain/account/Order.java

@@ -8,8 +8,6 @@
 import org.apache.commons.lang3.builder.ToStringBuilder;
 import org.apache.commons.lang3.builder.ToStringStyle;
 
-import java.math.BigDecimal;
-
 /**
  * Trade order information.
  */

src/main/java/com/binance/api/client/exception/BinanceApiException.java

@@ -7,7 +7,8 @@
  */
 public class BinanceApiException extends RuntimeException {
 
-  /**
+    private static final long serialVersionUID = 3788669840036201041L;
+/**
    * Error response object returned by Binance API.
    */
   private BinanceApiError error;

src/main/java/com/binance/api/client/security/AuthenticationInterceptor.java

@@ -60,10 +60,10 @@ public Response intercept(Chain chain) throws IOException {
      *
      * @return request body as a string
      */
+    @SuppressWarnings("unused")
     private static String bodyToString(RequestBody request) {
-        try {
+        try (final Buffer buffer = new Buffer()) {
             final RequestBody copy = request;
-            final Buffer buffer = new Buffer();
             if (copy != null) {
                 copy.writeTo(buffer);
             } else {

src/test/java/com/binance/api/examples/AggTradesCacheExample.java

@@ -4,8 +4,6 @@
 import com.binance.api.client.BinanceApiRestClient;
 import com.binance.api.client.BinanceApiWebSocketClient;
 import com.binance.api.client.domain.market.AggTrade;
-import com.binance.api.client.domain.market.Candlestick;
-import com.binance.api.client.domain.market.CandlestickInterval;
 
 import java.util.HashMap;
 import java.util.List;

src/test/java/com/binance/api/examples/GeneralEndpointsExampleAsync.java

@@ -2,7 +2,6 @@
 
 import com.binance.api.client.BinanceApiAsyncRestClient;
 import com.binance.api.client.BinanceApiClientFactory;
-import com.binance.api.client.domain.general.ExchangeInfo;
 import com.binance.api.client.domain.general.FilterType;
 import com.binance.api.client.domain.general.SymbolFilter;
 import com.binance.api.client.domain.general.SymbolInfo;

src/test/java/com/binance/api/examples/MarketDataEndpointsExample.java

@@ -2,7 +2,6 @@
 
 import com.binance.api.client.BinanceApiClientFactory;
 import com.binance.api.client.BinanceApiRestClient;
-import com.binance.api.client.domain.account.Account;
 import com.binance.api.client.domain.market.AggTrade;
 import com.binance.api.client.domain.market.BookTicker;
 import com.binance.api.client.domain.market.Candlestick;

src/test/java/com/binance/api/examples/MarketDataEndpointsExampleAsync.java

@@ -2,7 +2,6 @@
 
 import com.binance.api.client.BinanceApiAsyncRestClient;
 import com.binance.api.client.BinanceApiClientFactory;
-import com.binance.api.client.domain.account.Account;
 import com.binance.api.client.domain.market.AggTrade;
 import com.binance.api.client.domain.market.Candlestick;
 import com.binance.api.client.domain.market.CandlestickInterval;