如何为rmi设置日志级别？

我想屏蔽掉下面的日志信息，不知道该如何处理，请高手帮忙！
[20081125 15:45:59] 2008-11-25 15:45:59 sun.rmi.transport.tcp.TCPChannel$Reaper RMI ConnectionExpiration-[10.170.14.40:50018]: wake up
[20081125 15:45:59] 2008-11-25 15:45:59 sun.rmi.transport.tcp.TCPChannel RMI ConnectionExpiration-[10.170.14.40:50018]: connection timeout expired
[20081125 15:45:59] 2008-11-25 15:45:59 sun.rmi.transport.tcp.TCPConnection RMI ConnectionExpiration-[10.170.14.40:50018]: close connection
[20081125 15:45:59] 2008-11-25 15:45:59 sun.rmi.transport.tcp.TCPChannel$Reaper RMI ConnectionExpiration-[10.170.14.40:50018]: exit

[20081125 15:46:22] 2008-11-25 15:46:22 sun.rmi.server.UnicastRef RMI RenewClean-[10.170.14.40:50018]: get connection
[20081125 15:46:22] 2008-11-25 15:46:22 sun.rmi.transport.tcp.TCPChannel RMI RenewClean-[10.170.14.40:50018]: create connection
[20081125 15:46:22] 2008-11-25 15:46:22 sun.rmi.transport.tcp.TCPEndpoint RMI RenewClean-[10.170.14.40:50018]: opening socket to [10.170.14.40:50018]
[20081125 15:46:22] 2008-11-25 15:46:22 sun.rmi.transport.proxy.RMIMasterSocketFactory RMI RenewClean-[10.170.14.40:50018]: host: 10.170.14.40, port: 50018
[20081125 15:46:22] 2008-11-25 15:46:22 sun.rmi.transport.tcp.TCPChannel RMI RenewClean-[10.170.14.40:50018]: server suggested 10.170.14.40:51843
[20081125 15:46:22] 2008-11-25 15:46:22 sun.rmi.transport.tcp.TCPChannel RMI RenewClean-[10.170.14.40:50018]: using 10.170.14.40:0
[20081125 15:46:22] 2008-11-25 15:46:22 sun.rmi.server.UnicastRef RMI RenewClean-[10.170.14.40:50018]: create call context
[20081125 15:46:22] 2008-11-25 15:46:22 sun.rmi.server.UnicastRef RMI RenewClean-[10.170.14.40:50018]: outbound call: [endpoint:[10.170.14.40:50018]
(remote),objID:[0:0:0, 2]] : sun.rmi.transport.DGCImpl_Stub[0:0:0, 2]: void clean(java.rmi.server.ObjID[], long, java.rmi.dgc.VMID, boolean)
[20081125 15:46:22] 2008-11-25 15:46:22 sun.rmi.transport.StreamRemoteCall RMI RenewClean-[10.170.14.40:50018]: write remote call header...
[20081125 15:46:22] 2008-11-25 15:46:22 sun.rmi.transport.StreamRemoteCall RMI RenewClean-[10.170.14.40:50018]: getting output stream