获取字段有序

mybatis-plus-core/src/main/java/com/baomidou/mybatisplus/core/toolkit/ReflectionKit.java

@@ -25,7 +25,6 @@ import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
 import static java.util.function.Function.identity;
-import static java.util.stream.Collectors.toCollection;
 import static java.util.stream.Collectors.toMap;
 
 /**
@@ -232,7 +231,11 @@ public class ReflectionKit {
      */
     public static Map<String, Field> excludeOverrideSuperField(Field[] fields, List<Field> superFieldList) {
         // 子类属性
-        Map<String, Field> fieldMap = Stream.of(fields).collect(toMap(Field::getName, identity()));
+        Map<String, Field> fieldMap = Stream.of(fields).collect(toMap(Field::getName, identity(),
+            (u, v) -> {
+                throw new IllegalStateException(String.format("Duplicate key %s", u));
+            },
+            LinkedHashMap::new));
         superFieldList.stream().filter(field -> !fieldMap.containsKey(field.getName()))
             .forEach(f -> fieldMap.put(f.getName(), f));
         return fieldMap;