1. A method of modifying a virtual machine functionality, the method comprising: receiving one or more archive files each including at least a class file; storing the one or more archive files within the virtual machine, wherein the virtual machine runs on a host system and neither the virtual machine nor the host system are restarted in response to the receiving or storing of the one or more archive files; scanning files of the host system to find one or more class files that are not included in a class path for the virtual machine; copying the one or more class files to a class path for the virtual machine, wherein neither the virtual machine nor the host system are restarted in response to the copying of the one or more class files; and registering one or more classes corresponding to the one or more class files in the virtual machine in response to the copying of the one or more class files to the class path, wherein neither the virtual machine nor the host system are restarted in response to the registration of the one or more classes.