Thank you so much for your answer but i still get the same error, i'm affraid if i try the second code it wont work bc xmlrpc in android doesn't work well because i'm using a light weight library called aXMLRPC that was develppd by someone in github

Hi Hanane,

In your code Object Array should be define as follow:

Object[] l = new Object[]{ "is_company", "=", false};
Object[] filter = new Object[]{l};

You can try following working code for java :

package odoo.java;
import java.net.MalformedURLException;
import java.net.URL;
import org.apache.xmlrpc.XmlRpcException;
import org.apache.xmlrpc.client.XmlRpcClient;
import org.apache.xmlrpc.client.XmlRpcClientConfigImpl;
public class JavaOdoo {
	public static void main(String[] args){
		final XmlRpcClient client = new XmlRpcClient();
		Object[] emptyList = new Object[]{};
		final String url = "http://192.168.153.128:8069";
		final String db = "demo_80";
		final String username = "admin";
		final String password = "a";
		System.out.print("Hello World");
		final XmlRpcClientConfigImpl common_config = new XmlRpcClientConfigImpl();
		try {
			common_config.setServerURL(
				    new URL(String.format("%s/xmlrpc/2/common", url)));
				client.execute(common_config, "version", emptyList);
			int uid = (int)client.execute(
				    common_config, "authenticate", new Object[]{db, username, password, emptyList});
			System.out.print(uid);
			final XmlRpcClient models = new XmlRpcClient() {{
			    setConfig(new XmlRpcClientConfigImpl() {{
			        setServerURL(new URL(String.format("%s/xmlrpc/2/object", url)));
			    }});
			}};
			Object[] res = (Object[]) models.execute("execute_kw", new Object[]{
				    db, uid, password,
				    "res.partner", "search",
				    new Object[]{new Object[]{
				        new Object[]{"is_company", "=", false}}}
			});
                         // printing ids of partner which have is_company false.
			for(int i=0;i<res.length;i++){
				System.out.println(res[i]);
			}
		} catch (XmlRpcException | MalformedURLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

Regards,

Hardikgiri Goswami