when i compile the idl file with your IDL compiler (idl.bat) ,the 
RuntimeException is occured.But when i compile it with the idl-to-java
compiler(idlj.exe) ,it can be compiled normally.
  

the idl file is :

module demo{
		interface top{
				const string Class="top";
		};
		
		interface subnetwork : top{
				const string Class="subnetwork";
		};
};