From d1be7b91d99e270173a37c3b71c3ab10144646f1 Mon Sep 17 00:00:00 2001
From: Jerry Lee <oldratlee@gmail.com>
Date: Sat, 18 Sep 2021 10:51:22 +0800
Subject: [PATCH] expt: fix #293

---
 src/main/java/com/alibaba/ttl/TransmittableThreadLocal.java | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/main/java/com/alibaba/ttl/TransmittableThreadLocal.java b/src/main/java/com/alibaba/ttl/TransmittableThreadLocal.java
index d062504af..9957de03e 100644
--- a/src/main/java/com/alibaba/ttl/TransmittableThreadLocal.java
+++ b/src/main/java/com/alibaba/ttl/TransmittableThreadLocal.java
@@ -227,7 +227,8 @@ private void removeThisFromHolder() {
     }
 
     private static void doExecuteCallback(boolean isBefore) {
-        for (TransmittableThreadLocal<Object> threadLocal : holder.get().keySet()) {
+        WeakHashMap<TransmittableThreadLocal<Object>, ?> h = new WeakHashMap<TransmittableThreadLocal<Object>, Object>(holder.get());
+        for (TransmittableThreadLocal<Object> threadLocal : h.keySet()) {
             try {
                 if (isBefore) threadLocal.beforeExecute();
                 else threadLocal.afterExecute();