🎨 #3628【企业微信】修复更新用户接口重置用户直属领导字段的问题

weixin-java-cp/src/main/java/me/chanjar/weixin/cp/util/json/WxCpUserGsonAdapter.java

@@ -281,7 +281,12 @@ public class WxCpUserGsonAdapter implements JsonDeserializer<WxCpUser>, JsonSeri
     }
     addProperty(o, MAIN_DEPARTMENT, user.getMainDepartment());
 
-    addArrayProperty(o, DIRECT_LEADER, user.getDirectLeader());
+    // Special handling for directLeader: include empty arrays to support WeChat Work API reset functionality
+    if (user.getDirectLeader() != null) {
+      JsonArray directLeaderArray = new JsonArray();
+      Arrays.stream(user.getDirectLeader()).forEach(directLeaderArray::add);
+      o.add(DIRECT_LEADER, directLeaderArray);
+    }
 
     if (!user.getExtAttrs().isEmpty()) {
       JsonArray attrsJsonArray = new JsonArray();

weixin-java-cp/src/test/java/me/chanjar/weixin/cp/util/json/WxCpUserGsonAdapterTest.java

@@ -180,4 +180,31 @@ public class WxCpUserGsonAdapterTest {
       "{\"type\":2,\"name\":\"测试app\"," +
       "\"miniprogram\":{\"appid\":\"wx8bd80126147df384\",\"pagepath\":\"/index\",\"title\":\"my miniprogram\"}}]}}");
   }
+
+  /**
+   * Test directLeader empty array serialization.
+   * This test verifies that empty directLeader arrays are included in JSON as "direct_leader":[]
+   * instead of being omitted, which is required for WeChat Work API to reset user direct leaders.
+   */
+  @Test
+  public void testDirectLeaderEmptyArraySerialization() {
+    WxCpUser user = new WxCpUser();
+    user.setUserId("testuser");
+    user.setName("Test User");
+    
+    // Test with empty array - should be serialized as "direct_leader":[]
+    user.setDirectLeader(new String[]{});
+    String json = user.toJson();
+    assertThat(json).contains("\"direct_leader\":[]");
+    
+    // Test with null - should not include direct_leader field
+    user.setDirectLeader(null);
+    json = user.toJson();
+    assertThat(json).doesNotContain("direct_leader");
+    
+    // Test with non-empty array - should be serialized normally
+    user.setDirectLeader(new String[]{"leader1", "leader2"});
+    json = user.toJson();
+    assertThat(json).contains("\"direct_leader\":[\"leader1\",\"leader2\"]");
+  }
 }