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                            1. 在出問題的服務器上部署一個 arthas，并啟動。
2. jad --source-only 類全限定名 >目錄/文件名,java
```
jad --source-only com. itheima.springbotclassfile,controller.Usercontroller > /opt/jvm/Usercontroller.java
```
jad 命令反編譯，然后可以用其它編譯器，比如 vim 來修改源碼
3. mc-c類加載器的hashcode 目錄/文件名,java -d 輸出目錄mc 命令用來編譯修改過的代碼, mc 命令來內存編譯修改過的代碼
```
sc -d com. itheima.springbotclassfile,controller.Usercontroller 
mc -c 類的hashcode值  /opt/jvm/Usercontroller.java -d /opt/jvm
```
4. retransform class文件所在目錄/xxx.class,用retransform 命令加載新的字節碼
```
retransform /opt/jvm/Usercontroller.java
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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