L2J Server

Hello.
In L2j you have the ability to replace some .java files, run reload scripts (for example), new .java files will recompile at live server without restart.
How's that process or ability called ? I want to read about it, but don't even know what to google. And anyone knows if there is the same thing in C# ?

The reload command takes the files and compiles it using ECJ (Eclipse Compiler for Java), you can do the same on C# with CodeDom.

Thanks.