Fix ETH feeHistory (#1834)

* fix fee

Author: gtebrean

core/src/main/java/org/web3j/protocol/core/Ethereum.java

@@ -111,9 +111,22 @@ public interface Ethereum {
 
     Request<?, EthMaxPriorityFeePerGas> ethMaxPriorityFeePerGas();
 
+    @Deprecated
+    /**
+     * Method receives wrong type parameter int for blockCount, according to documentation the type
+     * should be String which is the encoded hex of the blocks number. This is kept for backward
+     * compatibility
+     *
+     * @param blockCount Requested range of blocks
+     * @param newestBlock Highest block of the requested range.
+     * @param rewardPercentiles A monotonically increasing list of percentile values.
+     */
     Request<?, EthFeeHistory> ethFeeHistory(
             int blockCount, DefaultBlockParameter newestBlock, List<Double> rewardPercentiles);
 
+    Request<?, EthFeeHistory> ethFeeHistory(
+            String blockCount, DefaultBlockParameter newestBlock, List<Double> rewardPercentiles);
+
     Request<?, EthAccounts> ethAccounts();
 
     Request<?, EthBlockNumber> ethBlockNumber();

core/src/main/java/org/web3j/protocol/core/JsonRpc2_0Web3j.java

@@ -233,6 +233,7 @@ public Request<?, EthMaxPriorityFeePerGas> ethMaxPriorityFeePerGas() {
     }
 
     @Override
+    @Deprecated
     public Request<?, EthFeeHistory> ethFeeHistory(
             int blockCount, DefaultBlockParameter newestBlock, List<Double> rewardPercentiles) {
         return new Request<>(
@@ -242,6 +243,16 @@ public Request<?, EthFeeHistory> ethFeeHistory(
                 EthFeeHistory.class);
     }
 
+    @Override
+    public Request<?, EthFeeHistory> ethFeeHistory(
+            String blockCount, DefaultBlockParameter newestBlock, List<Double> rewardPercentiles) {
+        return new Request<>(
+                "eth_feeHistory",
+                Arrays.asList(blockCount, newestBlock.getValue(), rewardPercentiles),
+                web3jService,
+                EthFeeHistory.class);
+    }
+
     @Override
     public Request<?, EthAccounts> ethAccounts() {
         return new Request<>(

core/src/test/java/org/web3j/protocol/core/RequestTest.java

@@ -156,10 +156,14 @@ public void testEthMaxPriorityFeePerGas() throws Exception {
 
     @Test
     public void testEthFeeHistory() throws Exception {
-        web3j.ethFeeHistory(1, DefaultBlockParameterName.LATEST, null).send();
+        web3j.ethFeeHistory(
+                        Numeric.toHexStringWithPrefixZeroPadded(BigInteger.valueOf(1), 1),
+                        DefaultBlockParameterName.LATEST,
+                        null)
+                .send();
 
         verifyResult(
-                "{\"jsonrpc\":\"2.0\",\"method\":\"eth_feeHistory\",\"params\":[1,\"latest\",null],\"id\":1}");
+                "{\"jsonrpc\":\"2.0\",\"method\":\"eth_feeHistory\",\"params\":[\"0x1\",\"latest\",null],\"id\":1}");
     }
 
     @Test