[JDEV] peculiar Connection problem !

[Satish Plakote]

hi
I have hit upon a problem while making a connection to a jabber server..
I am trying to  establish a connection to a jabber server thro a servlet on my tomcat engine.I am doing this coz of restriction
placed by jvm on applets to make a connection.
I get this exception thrown when i try to make a connection.

java.lang.NoSuchMethodError: java.net.Socket: method setKeepAlive(Z)V not found
        at com.echomine.net.SocketConnector$_1.run(SocketConnector.java:280)
        at java.lang.Thread.run(Thread.java:479)

can anyone give me tips to handle this ?
Thnkx
Satish