1. import the service provider certificate in ur trust store.
2. set below properties in ur web services client program:
System.setProperty("java.protocol.handler.pkgs","com.ibm.net.ssl.internal.www.protocol");
Security.addProvider(new JSSEProvider());
System.setProperty("javax.net.ssl.trustStore","mykeystore.ks");
System.setProperty("javax.net.ssl.trustStorePassword", "mystorepassword");
// if u behind a firewall proxy then set below
System.setProperty("http.proxyHost", "140.4236.2435.47");
System.setProperty("http.proxyPort", "31248");