Pb ds le lancement de la commande rmiregistry

Bonjour,
je travail sur RMi dans ubunto et lors de lancement de la commande rmiregistry &, le terminal m'affiche :
[1] 8099
root@Ubuntu_vir3:# java.rmi.server.ExportException: Port already in use: 1099; nested exception is:
java.net.BindException: Address already in use
at sun.rmi.transport.tcp.TCPTransport.listen(TCPTransport.java:328)
at sun.rmi.transport.tcp.TCPTransport.exportObject(TCPTransport.java:236)
at sun.rmi.transport.tcp.TCPEndpoint.exportObject(TCPEndpoint.java:411)
at sun.rmi.transport.LiveRef.exportObject(LiveRef.java:147)
at sun.rmi.server.UnicastServerRef.exportObject(UnicastServerRef.java:207)
at sun.rmi.registry.RegistryImpl.setup(RegistryImpl.java:110)
at sun.rmi.registry.RegistryImpl.<init>(RegistryImpl.java:96)
at sun.rmi.registry.RegistryImpl.main(RegistryImpl.java:340)
Caused by: java.net.BindException: Address already in use
at java.net.PlainSocketImpl.socketBind(Native Method)
at java.net.AbstractPlainSocketImpl.bind(AbstractPlainSocketImpl.java:336)
at java.net.ServerSocket.bind(ServerSocket.java:336)
at java.net.ServerSocket.<init>(ServerSocket.java:202)
at java.net.ServerSocket.<init>(ServerSocket.java:114)
at sun.rmi.transport.proxy.RMIDirectSocketFactory.createServerSocket(RMIDirectSocketFactory.java:45)
at sun.rmi.transport.proxy.RMIMasterSocketFactory.createServerSocket(RMIMasterSocketFactory.java:351)
at sun.rmi.transport.tcp.TCPEndpoint.newServerSocket(TCPEndpoint.java:667)
at sun.rmi.transport.tcp.TCPTransport.listen(TCPTransport.java:317)
... 7 more

si qq a une idée, m'aide à trouver une sol