From d343fdb6022d9168fe6c813629b9a0634bfe935e Mon Sep 17 00:00:00 2001
From: xiruibin <xiruibin@xinyunlian.com>
Date: Mon, 22 Apr 2019 18:26:53 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E6=94=B9setAttribute=E6=96=B9?=
 =?UTF-8?q?=E6=B3=95=EF=BC=8C=E5=BD=93key=E5=80=BC=E4=B8=BAnull=E6=88=96?=
 =?UTF-8?q?=E8=80=85=E4=B8=8D=E5=AD=98=E5=9C=A8=E6=97=B6=EF=BC=8C=E8=AE=BE?=
 =?UTF-8?q?=E7=BD=AEvalue=E4=B8=BAnull=E5=AF=BC=E8=87=B4=E7=A9=BA=E6=8C=87?=
 =?UTF-8?q?=E9=92=88=E9=97=AE=E9=A2=98?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../java/com/radiadesign/catalina/session/RedisSession.java   | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/main/java/com/radiadesign/catalina/session/RedisSession.java b/src/main/java/com/radiadesign/catalina/session/RedisSession.java
index fde1fdff..1940bed0 100644
--- a/src/main/java/com/radiadesign/catalina/session/RedisSession.java
+++ b/src/main/java/com/radiadesign/catalina/session/RedisSession.java
@@ -53,6 +53,10 @@ public void setAttribute(String key, Object value) {
     }
 
     Object oldValue = getAttribute(key);
+    if (value == null && oldValue == null) {
+      return;
+    }
+    
     if ( value == null && oldValue != null
          || oldValue == null && value != null
          || !value.getClass().isInstance(oldValue)