From c93fb9d59bea079fd9c834f8d9a70875f202ba0d Mon Sep 17 00:00:00 2001
From: hengyunabc <hengyunabc@gmail.com>
Date: Mon, 18 Feb 2019 00:15:22 +0800
Subject: [PATCH] redefine command check class if loaded.

---
 .../arthas/core/command/klass100/RedefineCommand.java       | 6 ++++++
 1 file changed, 6 insertions(+)

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 2be886ad1..39ee41e91 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
@@ -120,6 +120,12 @@ public class RedefineCommand extends AnnotatedCommand {
         }
 
         try {
+            if (definitions.isEmpty()) {
+                process.write("These classes are not found in the JVM and may not be loaded: " + bytesMap.keySet()
+                                + "\n");
+                process.end();
+                return;
+            }
             inst.redefineClasses(definitions.toArray(new ClassDefinition[0]));
             process.write("redefine success, size: " + definitions.size() + "\n");
         } catch (Exception e) {