Do you want to know how to create a proxy in WSO2 ESB without using UI. Here is a sample code
that will help you to understand how to use an admin service to achieve the task.

package org.wso2.test;

import org.apache.axis2.AxisFault;
import org.wso2.carbon.proxyadmin.stub.ProxyServiceAdminProxyAdminException;
import org.wso2.carbon.proxyadmin.stub.ProxyServiceAdminStub;
import org.wso2.carbon.proxyadmin.stub.types.carbon.ProxyData;
import org.wso2.carbon.utils.CarbonUtils;

import java.rmi.RemoteException;

public class TestProxy {

    public static void main(String[] args)
            throws RemoteException, ProxyServiceAdminProxyAdminException {

        String userName = "admin";
        String password = "admin";
        // Add the service URL
        String serviceEndPoint="http://localhost:8281/services/echo" ;
        // Proxy Admin service's endpoing URL
        String endPoint = "https://localhost:9444/services/" +"ProxyServiceAdmin";

        // Set client trust store
        System.setProperty("javax.net.ssl.trustStore", "/media/data/wso2/products/wso2/esb/" +
                                                       "wso2esb-4.5.0/repository/resources/security" +
                                                       "/client-truststore.jks");
        System.setProperty("javax.net.ssl.trustStorePassword", "wso2carbon");
        System.setProperty("javax.net.ssl.trustStoreType","JKS");

        ProxyServiceAdminStub proxyServiceAdminStub = new ProxyServiceAdminStub(endPoint);

        CarbonUtils.setBasicAccessSecurityHeaders(userName, password,
                                                  proxyServiceAdminStub._getServiceClient());

        //Set proxy configuration data
        String[] transport = {"http", "https"};
        ProxyData data = new ProxyData();
        data.setName("TestProxy2");
        data.setWsdlURI("http://localhost:8281/services/echo?wsdl");
        data.setTransports(transport);
        data.setStartOnLoad(true);
        data.setEndpointXML("<endpoint http:="http:" ns="ns" synapse="synapse" ws.apache.org="ws.apache.org" xmlns="\"><address serviceendpoint="serviceendpoint" uri="\">
</address>
</endpoint>");
        data.setEnableSecurity(true);

        proxyServiceAdminStub.addProxy(data);
    }
}