Add overrides and null pointer checks

Author: stevenlagoy

src/main/java/core/FileOperations.java

@@ -91,6 +91,9 @@ public static Set<Path> listFiles(Path dir, FileExtension extension) throws IOEx
         }
         try (DirectoryStream<Path> stream = Files.newDirectoryStream(dir)) {
             for (Path path : stream) {
+                if (path == null || path.getFileName() == null) {
+                    continue; // Skip null paths
+                }
                 String fileName = path.getFileName().toString();
                 if (!Files.isDirectory(path) && !FilePaths.IGNORED_FILES.contains(fileName)
                         && fileName.endsWith(extension.getExtension())) {
@@ -99,7 +102,7 @@ public static Set<Path> listFiles(Path dir, FileExtension extension) throws IOEx
             }
             return pathSet;
         } catch (IOException e) {
-            System.out.println("Error accessing directory: " + dir);
+            System.err.println("Error accessing directory: " + dir + " - " + e.getMessage());
             throw e;
         }
     }

src/main/java/core/JSONObject.java

@@ -471,6 +471,7 @@ public int hashCode() {
      *
      * @see JSONObject#toString()
      */
+    @Override
     public boolean equals(JSONObject other) {
         return this.toString().equals(other.toString());
     }