From 7e7b9a22c6bec0baf3d5b05e2b0c2de4d4d953ee Mon Sep 17 00:00:00 2001
From: niu-dali <112364662+niu-dali@users.noreply.github.com>
Date: Fri, 21 Apr 2023 22:27:46 +0800
Subject: [PATCH] fix  NullPointerException

fix "NullPointerException throw by maybeReadTimeOut() that can cause Eureka cluster registration inconsistency"

https://github.com/Netflix/eureka/issues/1497
---
 .../eureka/cluster/ReplicationTaskProcessor.java     | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/eureka-core/src/main/java/com/netflix/eureka/cluster/ReplicationTaskProcessor.java b/eureka-core/src/main/java/com/netflix/eureka/cluster/ReplicationTaskProcessor.java
index 961385b31a..01e28fc32e 100644
--- a/eureka-core/src/main/java/com/netflix/eureka/cluster/ReplicationTaskProcessor.java
+++ b/eureka-core/src/main/java/com/netflix/eureka/cluster/ReplicationTaskProcessor.java
@@ -193,11 +193,13 @@ private static boolean isNetworkConnectException(Throwable e) {
     private static boolean maybeReadTimeOut(Throwable e) {
         do {
             if (IOException.class.isInstance(e)) {
-            	String message = e.getMessage().toLowerCase();
-            	Matcher matcher = READ_TIME_OUT_PATTERN.matcher(message);
-            	if(matcher.find()) {
-            		return true;
-            	}
+            	String message = e.getMessage();
+                if (message != null) {
+                    Matcher matcher = READ_TIME_OUT_PATTERN.matcher(message.toLowerCase());
+                    if(matcher.find()) {
+                        return true;
+                    }
+                }
             }
             e = e.getCause();
         } while (e != null);