Dynamic loading of class in RMI

I create a interface...and implement in SERVER ....
when i RUN client i got Exception CLASS DEF NOT FOUND....

FIRST I START WEB SERVER
1) ---> java NanoHTTPD 8080

then i start rmi registry
2) ---->RMIREGISTRY
then i start Server
3) ---->java -Djava.rmi.server.codebase=http://localhost:8080/ WarehouseServer
then i start client

4) ---->java WarehouseClient
when i run client then i got exception class name not found.....because i use Interface object in client code......

SO HOW DYNAMIC DOWNLOADING CLASS IS DONE???
if I Manually Copy CLASS file IN CLIENT directory then program successfully run.......
PLEAZE TELL ME HOW TO do a DYNAMIC DOWNLOADING CLASS.......

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