From abb815917dda52788ac62d67eedfaa4f0e79c4d8 Mon Sep 17 00:00:00 2001
From: wuwen <wuwen.55@aliyun.com>
Date: Sun, 8 Oct 2023 16:31:26 +0800
Subject: [PATCH] fixes GitHub Issue 462 (Internal class issues in the Java 21)

---
 src/main/javassist/bytecode/ConstPool.java | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/main/javassist/bytecode/ConstPool.java b/src/main/javassist/bytecode/ConstPool.java
index e8434dce..796ba9c9 100644
--- a/src/main/javassist/bytecode/ConstPool.java
+++ b/src/main/javassist/bytecode/ConstPool.java
@@ -672,6 +672,8 @@ public String getStringInfo(int index)
     public String getUtf8Info(int index)
     {
         Utf8Info utf = (Utf8Info)getItem(index);
+        if (utf == null)
+            return null;
         return utf.string;
     }