From 51842f7ff17ccd986381527116b40c182e97f22a Mon Sep 17 00:00:00 2001
From: hengyunabc <hengyunabc@gmail.com>
Date: Wed, 27 May 2020 19:49:32 +0800
Subject: [PATCH] fix redefine may throw NullPointerException problem. close
 #1215

---
 .../taobao/arthas/core/command/klass100/RedefineCommand.java   | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/core/src/main/java/com/taobao/arthas/core/command/klass100/RedefineCommand.java b/core/src/main/java/com/taobao/arthas/core/command/klass100/RedefineCommand.java
index 3a09c5d55..5bcdc2780 100644
--- a/core/src/main/java/com/taobao/arthas/core/command/klass100/RedefineCommand.java
+++ b/core/src/main/java/com/taobao/arthas/core/command/klass100/RedefineCommand.java
@@ -113,7 +113,8 @@ public class RedefineCommand extends AnnotatedCommand {
         List<ClassDefinition> definitions = new ArrayList<ClassDefinition>();
         for (Class<?> clazz : inst.getAllLoadedClasses()) {
             if (bytesMap.containsKey(clazz.getName())) {
-                if (hashCode != null && !Integer.toHexString(clazz.getClassLoader().hashCode()).equals(hashCode)) {
+                ClassLoader classLoader = clazz.getClassLoader();
+                if (classLoader != null && hashCode != null && !Integer.toHexString(classLoader.hashCode()).equals(hashCode)) {
                     continue;
                 }
                 definitions.add(new ClassDefinition(clazz, bytesMap.get(clazz.getName())));