- Increase the lower and upper limits for the Java Heap Size.

- Update the "ServerBaseURL" to the Public IP Address of the machine which is running the app.

build.gradle

@@ -55,6 +55,12 @@ dependencies {
     testImplementation "org.springframework.boot:spring-boot-starter-test"
 }
 
+// Set increased lower and upper limits for the java-execution.
+tasks.withType(JavaExec) {
+    jvmArgs = ['-Xms512m', '-Xmx8g']
+}
+
+
 configurations {
     // Eliminates slf4j-log4j12
     all*.exclude group: 'org.slf4j', module: 'slf4j-log4j12'

src/main/java/eu/openaire/urls_controller/util/UriBuilder.java

@@ -5,7 +5,11 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.core.env.Environment;
 
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
 import java.net.InetAddress;
+import java.net.MalformedURLException;
+import java.net.URL;
 
 public class UriBuilder {
 
@@ -24,7 +28,10 @@ public class UriBuilder {
         baseUrl += sslEnabled.equals("true") ? "s" : "";
         baseUrl += "://";
 
-        String hostName = InetAddress.getLoopbackAddress().getHostName();   // Non-null.
+        String hostName = getPublicIP();
+        if ( hostName == null )
+            hostName = InetAddress.getLoopbackAddress().getHostName();   // Non-null.
+
         baseUrl += hostName;
         String serverPort = environment.getProperty("server.port");
         if (serverPort == null) { // This is unacceptable!
@@ -34,11 +41,11 @@ public class UriBuilder {
         baseUrl += ":" + serverPort;
 
         String baseInternalPath = environment.getProperty("server.servlet.context-path");
-        if (baseInternalPath != null) {
-            if (!baseInternalPath.startsWith("/"))
+        if ( baseInternalPath != null ) {
+            if ( !baseInternalPath.startsWith("/") )
                 baseUrl += "/";
             baseUrl += baseInternalPath;
-            if (!baseInternalPath.endsWith("/"))
+            if ( !baseInternalPath.endsWith("/") )
                 baseUrl += "/";
         } else {
             logger.warn("No property \"server.servlet.context-path\" was found in \"application.properties\"!");    // Yes it's expected.
@@ -48,6 +55,25 @@ public class UriBuilder {
         logger.debug("ServerBaseURL: " + baseUrl);
     }
 
+    private static String getPublicIP()
+    {
+        String publicIpAddress = "";
+        URL url_name;
+        try {
+            url_name = new URL("https://api.ipify.org/");
+        } catch (MalformedURLException mue) {
+            logger.warn(mue.getMessage());
+            return null;
+        }
+        try (BufferedReader bf = new BufferedReader(new InputStreamReader(url_name.openStream()))) {
+            publicIpAddress = bf.readLine().trim();
+        } catch (Exception e) {
+            logger.warn("Cannot get the publicIP address for this machine!", e);
+            return null;
+        }
+        return publicIpAddress;
+    }
+
     public static String getBaseUrl() {
         return baseUrl;
     }