add test

hutool-core/src/main/java/org/dromara/hutool/core/exception/ExceptionUtil.java

@@ -421,12 +421,11 @@ public class ExceptionUtil {
 	 * @return 最尾端异常，传入null参数返回也为null
 	 */
 	public static Throwable getRootCause(final Throwable throwable) {
-		Throwable cause = throwable.getCause();
-		if (cause != null) {
-			return getRootCause(cause);
-		}else{
+		final Throwable cause = throwable.getCause();
+		if (null == cause) {
 			return throwable;
 		}
+		return getRootCause(cause);
 	}
 
 	/**

hutool-json/src/test/java/org/dromara/hutool/json/Issue3086Test.java

@@ -0,0 +1,70 @@
+/*
+ * 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.
+ */
+
+package org.dromara.hutool.json;
+
+import lombok.Data;
+import org.dromara.hutool.core.collection.ListUtil;
+import org.dromara.hutool.json.serialize.JSONObjectSerializer;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class Issue3086Test {
+
+	@Test
+	public void serializeTest() {
+		JSONUtil.putSerializer(TestBean.class, new TestBean());
+
+		final List<SimpleGrantedAuthority> strings = ListUtil.of(
+			new SimpleGrantedAuthority("ROLE_admin"),
+			new SimpleGrantedAuthority("ROLE_normal")
+		);
+		final TestBean testBean = new TestBean();
+		testBean.setAuthorities(strings);
+
+		Assertions.assertEquals("{\"authorities\":[\"ROLE_admin\",\"ROLE_normal\"]}",
+			JSONUtil.toJsonStr(testBean));
+	}
+
+	static class SimpleGrantedAuthority {
+		private final String role;
+
+		public SimpleGrantedAuthority(final String role) {
+			this.role = role;
+		}
+
+		public String getAuthority() {
+			return this.role;
+		}
+
+		public String toString() {
+			return this.role;
+		}
+	}
+
+	@Data
+	static class TestBean implements JSONObjectSerializer<TestBean> {
+		private Collection<SimpleGrantedAuthority> authorities = new ArrayList<>();
+
+		@Override
+		public void serialize(final JSONObject json, final TestBean testBean) {
+			final List<String> strings = testBean.getAuthorities()
+				.stream().map(SimpleGrantedAuthority::getAuthority).collect(Collectors.toList());
+			json.set("authorities",strings);
+		}
+	}
+}