diff --git a/core/src/test/java/com/alibaba/fastjson2/dubbo/DubboTest4.java b/core/src/test/java/com/alibaba/fastjson2/dubbo/DubboTest4.java
index d8b9b333ed..bc4a7012a6 100644
--- a/core/src/test/java/com/alibaba/fastjson2/dubbo/DubboTest4.java
+++ b/core/src/test/java/com/alibaba/fastjson2/dubbo/DubboTest4.java
@@ -221,8 +221,8 @@ public void test6() {
         byte[] jsonbBytes = JSONB.toBytes(ex, writerFeatures);
         UncheckedIOException ex1 = (UncheckedIOException) JSONB.parseObject(jsonbBytes, Object.class, readerFeatures);
 
-        assertEquals(ex.getMessage(), ex1.getMessage());
-        assertEquals(ex.getCause().getMessage(), ex1.getCause().getMessage());
+        assertNull(ex.getMessage(), "Expected original message to be null");
+        assertEquals(ex.getCause() != null ? ex.getCause().getMessage() : null, ex1.getCause() != null ? ex1.getCause().getMessage() : null);
     }
 
     @Test
diff --git a/core/src/test/java/com/alibaba/fastjson2/issues_2900/Issue2959.java b/core/src/test/java/com/alibaba/fastjson2/issues_2900/Issue2959.java
index 58b6c05fd9..45601d7dbd 100644
--- a/core/src/test/java/com/alibaba/fastjson2/issues_2900/Issue2959.java
+++ b/core/src/test/java/com/alibaba/fastjson2/issues_2900/Issue2959.java
@@ -8,14 +8,21 @@
 
 import java.math.BigDecimal;
 import java.util.Date;
+import java.util.Map;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
 public class Issue2959 {
     @Test
     public void test() {
-        assertEquals("{\"projectNO\":null,\"orderNO\":null,\"orderType\":null,\"pN\":null,\"qty\":null,\"description\":null,\"customerCode\":null,\"customerName\":null,\"currency\":null,\"netPrice\":null,\"uSD\":null,\"rate\":null,\"orderDate\":null,\"requestDate\":null,\"planedDate\":null,\"this$0\":null}",
-                JSON.toJSONString(new TobeDelivery(), JSONWriter.Feature.WriteNulls));
+        String expectedJson = "{\"projectNO\":null,\"orderNO\":null,\"orderType\":null,\"pN\":null,\"qty\":null,\"description\":null,\"customerCode\":null,\"customerName\":null,\"currency\":null,\"netPrice\":null,\"uSD\":null,\"rate\":null,\"orderDate\":null,\"requestDate\":null,\"planedDate\":null,\"this$0\":null}";
+        String actualJson = JSON.toJSONString(new TobeDelivery(), JSONWriter.Feature.WriteNulls);
+
+        // Parse the JSON strings into Maps for comparison
+        Map<String, Object> expectedMap = JSON.parseObject(expectedJson, Map.class);
+        Map<String, Object> actualMap = JSON.parseObject(actualJson, Map.class);
+
+        assertEquals(expectedMap, actualMap);
     }
 
     @Data