re introduce custom Deserializer for BaseFee/BaseFeeDrops because Bas…

…eFee is hex and BaseFeeDrops is decimal

xrpl4j-core/src/main/java/org/xrpl/xrpl4j/model/jackson/modules/BaseFeeDropsDeserializer.java

@@ -0,0 +1,53 @@
+package org.xrpl.xrpl4j.model.jackson.modules;
+
+/*-
+ * ========================LICENSE_START=================================
+ * xrpl4j :: model
+ * %%
+ * Copyright (C) 2020 - 2022 XRPL Foundation and its contributors
+ * %%
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * =========================LICENSE_END==================================
+ */
+
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
+import com.google.common.primitives.UnsignedLong;
+import org.xrpl.xrpl4j.model.transactions.XrpCurrencyAmount;
+
+import java.io.IOException;
+
+/**
+ * Custom Jackson deserializer for {@link XrpCurrencyAmount}s.
+ */
+public class BaseFeeDropsDeserializer extends StdDeserializer<XrpCurrencyAmount> {
+
+  /**
+   * No-args constructor.
+   */
+  public BaseFeeDropsDeserializer() {
+    super(XrpCurrencyAmount.class);
+  }
+
+  @Override
+  public XrpCurrencyAmount deserialize(JsonParser jsonParser, DeserializationContext ctxt) throws IOException {
+    // Pre-XRPFees SetFee transactions serialize `BaseFee` to a hex string. Post XRPFees SetFee transactions
+    // have a `BaseFeeDrops` field which is a decimal string.
+    if (jsonParser.currentName().equals("BaseFee")) {
+      return XrpCurrencyAmount.of(UnsignedLong.valueOf(jsonParser.getText(), 16));
+    } else {
+      return XrpCurrencyAmount.ofDrops(jsonParser.getValueAsLong());
+    }
+  }
+}

xrpl4j-core/src/main/java/org/xrpl/xrpl4j/model/transactions/SetFee.java

@@ -28,6 +28,7 @@
 import com.google.common.primitives.UnsignedInteger;
 import org.immutables.value.Value;
 import org.xrpl.xrpl4j.model.client.common.LedgerIndex;
+import org.xrpl.xrpl4j.model.jackson.modules.BaseFeeDropsDeserializer;
 
 import java.util.Optional;
 import javax.annotation.Nullable;
@@ -77,6 +78,7 @@ default String baseFee() {
    */
   @JsonProperty("BaseFeeDrops")
   @JsonAlias("BaseFee")
+  @JsonDeserialize(using = BaseFeeDropsDeserializer.class)
   XrpCurrencyAmount baseFeeDrops();
 
   /**