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How to determine if tests are running local or on the remote server

According to this tutorial, I am able to upload files on the website while running my tests locally and on the remote server.
As in the tutorial is:
For those of you doing this locally, all you need to do is use the
sendKeys command to type the local path of the file in any file field.
This works like a charm in all drivers. When moving this test to a
remote server (such as, for example, our Selenium 2 Cloud), all you
need to do is use the setFileDetector method to let WebDriver know
that you’re uploading files from your local computer to a remote
server instead of just typing a path.
on the remote server I have to use:
driver.setFileDetector(new LocalFileDetector());
...
upload.sendKeys("/Path/to/image.jpg");
and local just:
upload.sendKeys("/Path/to/image.jpg");
And this all works fine. Only the problem is, that there is no information how to determine if my tests are running local or on the remote server.
I have tried to determine instance of the webDriver:
WebDriver proxiedWebDriver = ((WebDriverFacade) getDriver()).getProxiedDriver();
if (proxiedWebDriver instanceof RemoteWebDriver) {
((RemoteWebDriver)proxiedWebDriver).setFileDetector(new LocalFileDetector());
}
but it seems like both(local and remote) cases are using RemoteWebDriver while running, because in every case I'm passing if condition.
How can I determine if my tests are running local or remote?

To get the address of the remote server you can use HttpCommandExecutor like this:
HttpCommandExecutor ce = (HttpCommandExecutor) ((RemoteWebDriver)driver).getCommandExecutor();
String remoteAddress = ce.getAddressOfRemoteServer().toString();
String localAddress = null;
try (Socket socket = new Socket()) {
socket.connect(new InetSocketAddress("google.com", 80));
localAddress = socket.getLocalAddress().getHostAddress();
} catch (IOException e) {
e.printStackTrace();
}
if (remoteAddress.contains("localhost") || remoteAddress.contains(localAddress)) System.out.println("Local machine");
else System.out.println("Remote machine");
The above code gets the Remote Server address (HUB) and compares it with your public IP address. It should give you the information if you are running local or remote server

Can't connect to MYSQL server which hosted in google instance

I got a google cloud platform - compute engine instance, which I installed MySQL server on.
And now I can't get any signal of life our of the VM the sql installed on,
for exsample:
package com.company;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class Main {
public static void connection(){
try {
Class.forName("com.mysql.jdbc.Driver");
System.out.println("in conncection");
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
public static void connectToMySQL(){
connection();
String host = "jdbc:mysql://hotsIP:3306/DBname";
String user = "user";
String pass = "password";
try {
Connection connection = DriverManager.getConnection(host,user,pass);
System.out.println("???");
} catch (SQLException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
connectToMySQL();
}
}
It's take a few second like he trying to connect and the EXEPTION
in conncection
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
What I done to make it work:
in the my.conf:bind address = 0.0.0.0, skip-external-locking comment out
restart the server
looked if the server is active
looked if the server listening to the port
looked if its TCP
I don't know what to do anymore.

You have to make the following change to your my.cnf file
my.cnf
bind-address = www.000webhost.com (OR)
bind-address = xx.xx.xx.xx (IP Address)
You need to restart your MySQL service, once this setting is changed.
Also worth noting is the point that MAMP/ MAMP Pro sets MAMP_skip-networking_MAMP by default. You've to disable this line in your my.cnf
And if you don't have any user login issues, you should be able to connect to the MySQL Database from your Java code.

In my case the root cause was: Firewall. I was trying to run the application at work.
What was interesting is that the App Engine Standard running locally actually generated a non-error log in Google Cloud Platform Logs, making me discard the firewall hypotheses.
Solution: I found out bringing my notebook from home and connecting to company's network, did not work. When I connected to the shared connection in my mobile, worked perfectly.

Java RMI call slow first time

I'm working on a personal project for school where I have to user RMI to communicate between server and client.
Project info
The goal of my project is to retrieve stock info (from NYSE) for each day on the server at a specific time (after NYSE is closed). Each stock object is saved in a database. The information is retrieved over http and has nothing to do with RMI.
For the client it is also possible to fetch the stocks. When a user wants to fetch the stock object for the current day, it is directly fetched from the 3th party service. When a user, for example, wants to fetch Google's stock from last month, it is requested on the server over RMI. The server will the look for the stock object in the database and retrieve a Stock object and send it to the client.
Problem
When I start the client application, I have to login. The client will create a User object containing the username and password.
When I press the login button, it will take around 2 minutes before the main screen will be shown.
Below the source code where I setup the RMI connection.
Server (main.java)
public static void main(String[] args) throws UnknownHostException {
InetAddress IP= InetAddress.getLocalHost();
System.out.println("IP of my system is := "+IP.getHostAddress());
if(args.length == 1 && args[0].toLowerCase().equals("local")) {
System.out.println("Running on localhost");
System.setProperty("java.rmi.server.hostname", IP.getHostAddress());
} else {
System.out.println("rmi hostname is set to 37.97.223.70");
System.setProperty("java.rmi.server.hostname", "37.97.223.70");
}
try {
Registry reg = LocateRegistry.createRegistry(1099);
StockAppServer server = StockAppServer.getInstance();
reg.rebind("StockApp", server);
System.out.println("StockApp bound for StockAppServer object.");
} catch (RemoteException e) {
e.printStackTrace();
}
}
Based on the arguments that are passed to the application when it starts, I set the RMI hostname to my current IP address, or to the remote server address. The remote server address is a static IP, so this won't change.
Server (StockAppServer.java)
This class implements the interfaces that is used by the client to call methods on the server. So this class extends UnicastRemoteObject. When I start the server, registerStockTask() will be called. This method will fetch the ticker symbols (What are ticker symbols?) and then schedule a task to fetch all stock objects at a specific time.
private static StockAppServer _instance;
private List<User> loggedInUsers;
private List<Group> activeGroups;
private List<Notification> registeredNotifications;
private StockAppServer() throws IOException {
_instance = this;
this.loggedInUsers = new ArrayList<>();
this.activeGroups = new ArrayList<>();
this.registeredNotifications = new ArrayList<>();
this.registerStockTask();
clearActiveGroups();
checkForCompletedNotifications();
// Start the restful framework to allow incoming connections from the NodeJS server to manage new notification
Router.getInstance();
}
public static StockAppServer getInstance() {
try{
return _instance == null ? new StockAppServer() : _instance;
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
Client (main.java)
public static void main(String[] arguments) throws Exception {
args = arguments;
Application.launch();
}
#Override
public void start(Stage primaryStage) throws Exception {
InetAddress IP= InetAddress.getLocalHost();
System.out.println("IP of my system is := "+IP.getHostAddress());
if(args.length == 1 && args[0].toLowerCase().equals("local")) {
// Program started with local command, expect that server is running on local host
reg = LocateRegistry.getRegistry(IP.getHostAddress(), 1099);
System.out.println("Attempting to connect to RMI server over 127.0.0.1");
} else {
// Program started without additional commands. Except that "the server" is available;
reg = LocateRegistry.getRegistry("37.97.223.70", 1099);
System.out.println("Attempting to connect to RMI server over 37.97.223.70");
}
try {
StockApp.getInstance().setServerInterfaces((IStockSend) reg.lookup("StockApp"), (IUserHandling) reg.lookup("StockApp"));
} catch(RemoteException e) {
AlertMessage.showException("Unable to connect to server.", e);
} catch (NotBoundException e) {
AlertMessage.showException("No server has been found with the name \"StockApp\" on the remote host.\nPlease try again later", e);
}
LoginController.showMenu();
//FileNotFoundException e = new FileNotFoundException("Couldn't find file blabla.txt");
//AlertMessage.showException("Something went wrong. Please try again later.", e);
}
How I tried to solve my problem
When I test my applications local, there is no problem. The login method will be finished within a few milliseconds and I will be represented the main screen.
I started by turning of my firewall on my macbook. No result, login method still takes around 2 seconds.
I turned off the firewall om my Ubuntu server. No result, both firewalls on server and macbook are turned off. Login method still takes around 2 seconds.
On the server runs (thanks to jenkins) another (unrelated) program. This program uses sockets instead of RMI. When this program is not running, the login method still takes around 2 minutes.
In StockAppServer.java, I called the following method:
super(1099);
This has the same outcome as the above steps I took.
I don't know what else I can try to solve my problem.
I tried to give as much code as possible for the RMI part. I you need any other source code, just ask and I can update this question. Also, the source code is available via github: https://github.com/juleskreutzer/GSO-Maatwerk. Make sure to run the program with -remote param.
Update 1 (9-1-2017)
As yanys requested in the comments, I should run the following command:
dscacheutil -q host -a name localhost
this returns the following output:
Mac:
name: localhost
ip_address: 127.0.0.1
Ubuntu:
dscacheutil: command not found
Update 2 (9-1-2017)
I checked with the provider of my VPS where I run the java server on. On their side everything should be OK. According to them, it shouldn't be a dns problem. After some research, I found out that RMI uses both DNS and reverse DNS. It this case, reverse DNS was the issue. Please see my answer on how I solved my problem.

As EJP pointed out in the comments on the question, it was an DNS problem.
I contacted the support of my hosting provider to see if I had some wrong settings. They helped me a lot in solving this problem.
First we tested the speed of my VPS, this is around 1000mbit download and upload speed. After we checked this, they said there was nothing wrong on their side.
After doing some research, I found out that RMI uses both DNS and Reverse DNS. The problem was that I didn't setup the reverse DNS on my server. I already have a domain name to use for reverse DNS.
I than did the following:
Create a A-record on my website that points to the IP address of the server. I named it vps.mydomain.com
Add the reverse DNS in the control panel of my server
Change the hostname of my server to vps.mydomain.com*
*My server runs Ubuntu 16.04, on ubuntu machines with systemd, you can use the command
sudo hostnamectl set-hostname new-name
to change the hostname

Java Socket connecting to a public ip-address

I need to make a server and client that connects to the server.
Problem: "the server works. the client can only connect to localhost, it cannot connect to a server on the internet. I want the client to connect to the server, via a public ip-address that the server is hosted on."
First of all, I have made sure that the port is forwarded and reachable i have tested the port, secondly i have disabled firewall completely from the server machine.
below is the test code i am using:
The Server: nothing fancy just simple - terminates if a client is connected, else just awaits a connection.
public class Server {
public static void main(String args[]) {
try {
ServerSocket srvr = new ServerSocket(52000);
srvr.accept();
}
catch(Exception e) {
e.printStackTrace();
}
}
}
The Client: I have used no-ip.com to mask the ip of the server to "biogenserver2.noip.me".
Using .getCanonicalHostName(); will return the ip.
public class Client {
public static void main(String args[]) {
try {
String ip = Inet4Address.getByName("somets.noip.com").getCanonicalHostName();
InetSocketAddress sa = new InetSocketAddress(ip, 52000);
//Socket skt = new Socket("0.0.0.0", 52000); //local - this works fine.
Socket skt = new Socket();
skt.connect(sa);
}
catch(Exception e) {
e.printStackTrace();
}
}
}
When i run this the server connects fine, but the client returns a "connection timeout" exception
Any help will be appreciated. Thanks.

Answer:
"Just for clarity: You have checked the port is open via public IP as returned by no-ip and the server will quit without exception when you run that little testclient (on a machine that is not the server machine) - is that correct?" – Fildor
TL:DR
Don't run the client and server on the same machine and the same network trying to connect to your server through your public ip then to your own local network will result in a client timeout exception
I was running the client and server on the same machine and also the same network. This caused the client timeout exception. I tried running the Client on a different machine and a different network and i was able to connect successfully.

What version of IP protocol your application uses? On linux, you may figure it out with netstat -tunap | grep 52000 and watching whether first field is tcp or tcp6. If latter, then it is possible that problem with IPv6 connectivity exists and you may want to prefer using IPv4 to IPv6 by specifying -Djava.net.preferIPv4Stack=true to JVM.

Issues with connecting to remote windows machine using Jsch

I am currently working on making one Java application which will execute commands (from command prompt) of remotely located Windows machine.
For developing this I have tried following:
Used Jsch library, the application worked well when connected to Unix machines, I was able to get list of processes using 'prstat -a' command, but when I tried with Windows machine, it gave me ConnectException(Timed out)
private final static String HOSTNAME = "SOMECOMPUTERNAME.XXX.XXX.XXX.COM";//
private final static String USERNAME = "SOMEUSERNAME";
private final static String PASSWORD = "SOMEPASSWORD";
private final static int PORT = 22;
public static void main(String[] args) {
JSch jscc = new JSch();
try {
Session session = jscc.getSession(USERNAME, HOSTNAME, PORT);
session.setPassword(PASSWORD);
Properties localProperties = new Properties();
localProperties.put("StrictHostKeyChecking", "no");
session.setConfig(localProperties);
session.connect(60000);
System.out.println("Session connected");
} catch (JSchException e) {
e.printStackTrace();
}
}
The target machine info:
Windows x64 workstation
Latest version of Java installed
Doesn't use any encryption
Please guide into this, Can it be done with Jsch library, if not that which method you can recommend.
Following things you can assume:
I don't want any code in target machine. So a Java application which resides in my workstation and just executes some simple window commands, like dir or start applicationName in the target window machine
I have username and corresponding passwords
I don't have the ipaddress, just a full computer name in format as shown in the code above(HOSTNAME)
Any suggestions are welcomed.
Regards,
icr

Windows does not have SSH installed by default. You will need a SSH client for windows.
I prefer OpenSSH....its free and works perfectly