Improve comments

src/main/java/org/parabot/core/desc/ServerProviderInfo.java

@@ -164,16 +164,22 @@ public class ServerProviderInfo {
         return settings;
     }
 
+    /**
+     * Gets the URL to download the Randoms JAR from.
+     * @return The provided URL in the server config JSON (denoted by 'randoms:') or, fallback to the default BDN URL.
+     */
     public URL getRandoms() {
         try {
             String randomsUrl = properties.getProperty("randoms_jar");
             if (randomsUrl == null || randomsUrl.length() == 0) {
+                // Fallback to default BDN URL if there is no 'randoms' specified in the server JSON configuration.
                 randomsUrl = Configuration.GET_RANDOMS + (Configuration.BOT_VERSION.isNightly() ? Configuration.NIGHTLY_APPEND : "");
             }
             return new URL(randomsUrl);
         } catch (MalformedURLException e) {
             e.printStackTrace();
         }
+        // Will never return null, unless the BDN URL is changed. It shouldn't be.
         return null;
     }
 }

src/main/java/org/parabot/core/parsers/randoms/PublicRandoms.java

@@ -27,7 +27,7 @@ public class PublicRandoms extends RandomParser {
         final File destination = new File(Directories.getCachePath() + File.separator + fileName);
         final URL overrideDownload = Context.getInstance().getServerProviderInfo().getRandoms();
         if (overrideDownload == null) {
-            throw new NullPointerException("randoms() URL is null - expected to default to BDN URL!");
+            throw new NullPointerException("Unable to grab URL for Randoms jar. Default URL for BDN randoms must have changed!");
         }
 
         Core.verbose(String.format("[%s] Destination: %s | dl: %s", getClass().getName(), destination, overrideDownload));