From cfb75078e0299d7569dc4a662c6842c66c646a20 Mon Sep 17 00:00:00 2001
From: "Darryl L. Pierce" <mcpierce@gmail.com>
Date: Fri, 13 Mar 2020 22:36:45 -0400
Subject: [PATCH] [Issue #178] Check that a directory has entries before
 searching it.

---
 .../org/comixed/service/file/FileService.java | 34 ++++++++++---------
 1 file changed, 18 insertions(+), 16 deletions(-)

diff --git a/comixed-services/src/main/java/org/comixed/service/file/FileService.java b/comixed-services/src/main/java/org/comixed/service/file/FileService.java
index 68508f3ce..3d8358b67 100644
--- a/comixed-services/src/main/java/org/comixed/service/file/FileService.java
+++ b/comixed-services/src/main/java/org/comixed/service/file/FileService.java
@@ -101,22 +101,24 @@ public List<FileDetails> getAllComicsUnder(final String rootDirectory) throws IO
   private void loadFilesUnder(final List<FileDetails> files, final File directory)
       throws IOException {
     this.logger.debug("Loading files in directory: {}", directory);
-    for (File file : directory.listFiles()) {
-      if (file.isDirectory()) {
-        this.loadFilesUnder(files, file);
-      } else {
-        if (ComicFileUtils.isComicFile(file)) {
-          final String filePath = file.getCanonicalPath();
-          final long fileSize = file.length();
-
-          final Comic comic = this.comicRepository.findByFilename(filePath);
-
-          if (comic != null) {
-            this.logger.debug("File already in the library: id={}", comic.getId());
-          } else {
-            this.logger.debug("Adding file: {} ({} bytes)", filePath, fileSize);
-
-            files.add(new FileDetails(filePath, fileSize));
+    if (directory.listFiles() != null) {
+      for (File file : directory.listFiles()) {
+        if (file.isDirectory()) {
+          this.loadFilesUnder(files, file);
+        } else {
+          if (ComicFileUtils.isComicFile(file)) {
+            final String filePath = file.getCanonicalPath();
+            final long fileSize = file.length();
+
+            final Comic comic = this.comicRepository.findByFilename(filePath);
+
+            if (comic != null) {
+              this.logger.debug("File already in the library: id={}", comic.getId());
+            } else {
+              this.logger.debug("Adding file: {} ({} bytes)", filePath, fileSize);
+
+              files.add(new FileDetails(filePath, fileSize));
+            }
           }
         }
       }