Fix datetime parser issue

Author: Jonathan Wenger

src/main/java/Avalara/SDK/JSON.java

@@ -13,7 +13,7 @@
 import java.time.LocalDate;
 import java.time.OffsetDateTime;
 import java.time.format.DateTimeFormatter;
-import Avalara.SDK.model.A1099.V2.*;
+import Avalara.SDK.model.A1099.V2.*;
 import Avalara.SDK.model.EInvoicing.V1.*;
 
 import okio.ByteString;
@@ -40,8 +40,7 @@ public class JSON {
 
     @SuppressWarnings("unchecked")
     public static GsonBuilder createGson() {
-        GsonFireBuilder fireBuilder = new GsonFireBuilder()
-        ;
+        GsonFireBuilder fireBuilder = new GsonFireBuilder();
         GsonBuilder builder = fireBuilder.createGsonBuilder();
         return builder;
     }
@@ -55,10 +54,13 @@ private static String getDiscriminatorValue(JsonElement readElement, String disc
     }
 
     /**
-     * Returns the Java class that implements the OpenAPI schema for the specified discriminator value.
+     * Returns the Java class that implements the OpenAPI schema for the specified
+     * discriminator value.
      *
-     * @param classByDiscriminatorValue The map of discriminator values to Java classes.
-     * @param discriminatorValue The value of the OpenAPI discriminator in the input data.
+     * @param classByDiscriminatorValue The map of discriminator values to Java
+     *                                  classes.
+     * @param discriminatorValue        The value of the OpenAPI discriminator in
+     *                                  the input data.
      * @return The Java class that implements the OpenAPI schema
      */
     private static Class getClassByDiscriminator(Map classByDiscriminatorValue, String discriminatorValue) {
@@ -71,12 +73,12 @@ private static Class getClassByDiscriminator(Map classByDiscriminatorValue, Stri
 
     public JSON() {
         gson = createGson()
-            .registerTypeAdapter(Date.class, dateTypeAdapter)
-            .registerTypeAdapter(java.sql.Date.class, sqlDateTypeAdapter)
-            .registerTypeAdapter(OffsetDateTime.class, offsetDateTimeTypeAdapter)
-            .registerTypeAdapter(LocalDate.class, localDateTypeAdapter)
-            .registerTypeAdapter(byte[].class, byteArrayAdapter)
-            .create();
+                .registerTypeAdapter(Date.class, dateTypeAdapter)
+                .registerTypeAdapter(java.sql.Date.class, sqlDateTypeAdapter)
+                .registerTypeAdapter(OffsetDateTime.class, offsetDateTimeTypeAdapter)
+                .registerTypeAdapter(LocalDate.class, localDateTypeAdapter)
+                .registerTypeAdapter(byte[].class, byteArrayAdapter)
+                .create();
     }
 
     /**
@@ -104,7 +106,8 @@ public JSON setGson(Gson gson) {
      *
      * @param lenientOnJson Set it to true to ignore some syntax errors
      * @return JSON
-     * @see <a href="https://www.javadoc.io/doc/com.google.code.gson/gson/2.8.5/com/google/gson/stream/JsonReader.html">https://www.javadoc.io/doc/com.google.code.gson/gson/2.8.5/com/google/gson/stream/JsonReader.html</a>
+     * @see <a href=
+     *      "https://www.javadoc.io/doc/com.google.code.gson/gson/2.8.5/com/google/gson/stream/JsonReader.html">https://www.javadoc.io/doc/com.google.code.gson/gson/2.8.5/com/google/gson/stream/JsonReader.html</a>
      */
     public JSON setLenientOnJson(boolean lenientOnJson) {
         isLenientOnJson = lenientOnJson;
@@ -134,7 +137,8 @@ public <T> T deserialize(String body, Type returnType) {
         try {
             if (isLenientOnJson) {
                 JsonReader jsonReader = new JsonReader(new StringReader(body));
-                // see https://www.javadoc.io/doc/com.google.code.gson/gson/2.8.5/com/google/gson/stream/JsonReader.html
+                // see
+                // https://www.javadoc.io/doc/com.google.code.gson/gson/2.8.5/com/google/gson/stream/JsonReader.html
                 jsonReader.setLenient(true);
                 return gson.fromJson(jsonReader, returnType);
             } else {
@@ -216,7 +220,13 @@ public OffsetDateTime read(JsonReader in) throws IOException {
                 default:
                     String date = in.nextString();
                     if (date.endsWith("+0000")) {
-                        date = date.substring(0, date.length()-5) + "Z";
+                        date = date.substring(0, date.length() - 5) + "Z";
+                    }
+                    // Handle datetime strings without timezone information by appending 'Z'
+                    // This addresses A1099 API responses that return local datetime strings
+                    // like '2025-05-06T23:33:25.358690' without timezone indicators
+                    else if (!date.endsWith("Z") && !date.matches(".*[+-]\\d{2}:?\\d{2}$")) {
+                        date = date + "Z";
                     }
                     return OffsetDateTime.parse(date, formatter);
             }
@@ -283,7 +293,8 @@ public static class SqlDateTypeAdapter extends TypeAdapter<java.sql.Date> {
 
         private DateFormat dateFormat;
 
-        public SqlDateTypeAdapter() {}
+        public SqlDateTypeAdapter() {
+        }
 
         public SqlDateTypeAdapter(DateFormat dateFormat) {
             this.dateFormat = dateFormat;
@@ -336,7 +347,8 @@ public static class DateTypeAdapter extends TypeAdapter<Date> {
 
         private DateFormat dateFormat;
 
-        public DateTypeAdapter() {}
+        public DateTypeAdapter() {
+        }
 
         public DateTypeAdapter(DateFormat dateFormat) {
             this.dateFormat = dateFormat;