修复没有属性的对象转json字符串抛异常问题

hutool-json/src/test/java/Issue3051Test.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2023 looly(loolly@aliyun.com)
+ * Hutool is licensed under Mulan PSL v2.
+ * You can use this software according to the terms and conditions of the Mulan PSL v2.
+ * You may obtain a copy of Mulan PSL v2 at:
+ *          http://license.coscl.org.cn/MulanPSL2
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PSL v2 for more details.
+ */
+
+import cn.hutool.json.JSONConfig;
+import cn.hutool.json.JSONObject;
+import cn.hutool.json.JSONUtil;
+import lombok.Data;
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * https://github.com/dromara/hutool/issues/3051
+ */
+public class Issue3051Test {
+	@Test
+	public void parseTest() {
+		final JSONObject jsonObject = JSONUtil.parseObj(new EmptyBean(),
+			JSONConfig.create().setIgnoreError(true));
+
+		Assert.assertEquals("{}", jsonObject.toString());
+	}
+
+	@Test
+	public void parseTest2() {
+		final JSONObject jsonObject = JSONUtil.parseObj(new EmptyBean());
+
+		Assert.assertEquals("{}", jsonObject.toString());
+	}
+
+	@Data
+	static class EmptyBean {
+
+	}
+}