Add public SSL certificate of random site to your JKS

openssl s_client -connect server.example.com:443 

$JAVA_HOME/bin/keytool -import -alias server -file server.crt  -keystore /path/to/store.jks -storepass ******

java -Djavax.net.ssl.trustStore=/path/to/store.jks SSLPoke  server.example.com 443

import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import java.io.*;
/** Establish a SSL connection to a host and port, writes a byte and
 * prints the response. See
 * http://confluence.atlassian.com/display/JIRA/Connecting+to+SSL+services
 */
public class SSLPoke {
    public static void main(String[] args) {
                if (args.length != 2) {
                        System.out.println("Usage: "+SSLPoke.class.getName()+" <host> <port>");
                        System.exit(1);
                }
                try {
                        SSLSocketFactory sslsocketfactory = (SSLSocketFactory) SSLSocketFactory.getDefault();
                        SSLSocket sslsocket = (SSLSocket) sslsocketfactory.createSocket(args[0], Integer.parseInt(args[1]));
                        InputStream in = sslsocket.getInputStream();
                        OutputStream out = sslsocket.getOutputStream();
                        // Write a test byte to get a reaction :)
                        out.write(1);
                        while (in.available() > 0) {
                                System.out.print(in.read());
                        }
                        System.out.println("Successfully connected");
                } catch (Exception exception) {
                        exception.printStackTrace();
                }
        }
}

javac SSLPOKE.java