Always use random hub port to support multiple local grids in a commo…

…n environment.

client/src/main/java/com/paypal/selion/internal/platform/grid/LocalHub.java

@@ -16,6 +16,7 @@
 package com.paypal.selion.internal.platform.grid;
 
 import org.openqa.selenium.net.NetworkUtils;
+import org.openqa.selenium.net.PortProber;
 
 import com.paypal.selion.configuration.Config;
 import com.paypal.selion.configuration.Config.ConfigProperty;
@@ -44,7 +45,12 @@ synchronized LocalHub getLocalServerComponent() {
             instance = new LocalHub();
 
             instance.setHost(new NetworkUtils().getIpOfLoopBackIp4());
-            instance.setPort(Integer.parseInt(Config.getConfigProperty(ConfigProperty.SELENIUM_PORT)));
+
+            // Choose a random port for local hub.
+            int hubPort = PortProber.findFreePort();
+            // Set ConfigProperty.SELENIUM_PORT so that the local nodes can register to it.
+            instance.setPort(hubPort);
+            Config.setConfigProperty(ConfigProperty.SELENIUM_PORT, Integer.toString(hubPort));
 
             LauncherOptions launcherOptions = new LauncherOptionsImpl()
                     .setFileDownloadCheckTimeStampOnInvocation(false).setFileDownloadCleanupOnInvocation(false);
@@ -75,4 +81,5 @@ public void shutdown() {
         super.shutdown();
         LOGGER.exiting();
     }
+
 }