[Java] Use localhost instead of public ip (#21462)

Use localhost ip address instead of public ip for avoid security popups on MacOS.
This also reverts This reverts commit e4542be0d1.

java/runtime/src/main/java/io/ray/runtime/config/RayConfig.java

@@ -19,6 +19,7 @@ import java.util.List;
 import java.util.Map;
 import java.util.UUID;
 import org.apache.commons.lang3.StringUtils;
+import org.apache.commons.lang3.SystemUtils;
 
 /** Configurations of Ray runtime. See `ray.default.conf` for the meaning of each field. */
 public class RayConfig {
@@ -111,8 +112,15 @@ public class RayConfig {
     if (config.hasPath("ray.node-ip")) {
       nodeIp = config.getString("ray.node-ip");
     } else {
+      if (SystemUtils.IS_OS_LINUX) {
         nodeIp = NetworkUtil.getIpAddress(null);
+      } else {
+        /// We use a localhost on MacOS or Windows to avid security popups.
+        /// See the related issue https://github.com/ray-project/ray/issues/18730
+        nodeIp = NetworkUtil.localhostIp();
       }
+    }
+
     // Job id.
     String jobId = config.getString("ray.job.id");
     if (!jobId.isEmpty()) {

java/runtime/src/main/java/io/ray/runtime/runner/RunManager.java

@@ -28,8 +28,6 @@ public class RunManager {
     command.add("--head");
     command.add("--redis-password");
     command.add(rayConfig.redisPassword);
-    command.add("--node-ip-address");
-    command.add(rayConfig.nodeIp);
     command.addAll(rayConfig.headArgs);
 
     String numGpus = System.getProperty("num-gpus");

java/runtime/src/main/java/io/ray/runtime/util/NetworkUtil.java

@@ -43,4 +43,8 @@ public class NetworkUtil {
 
     return "127.0.0.1";
   }
+
+  public static String localhostIp() {
+    return "127.0.0.1";
+  }
 }