> 
> **Possible Duplicate:**  
> 
> [Updating .class file in jar](https://stackoverflow.com/questions/1667153/updating-class-file-in-jar) 
> 
> 
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I want to selectively update an existing jar file (outside the workspace) adding/updating some .class files (scattered throughout the hierarchy in build folder) generated in my eclipse workspace. The existing jar file can have some different classes (than the workspace), so I can't simply do an 'export'. Is there any tool/plugin/easy way to achieve this?