remove exception handling

persistence-modules/spring-boot-persistence-mongodb/src/main/java/com/baeldung/mongodb/services/PhotoService.java

@@ -1,7 +1,6 @@
 package com.baeldung.mongodb.services;
 
 import java.io.IOException;
-import java.util.Optional;
 
 import org.bson.BsonBinarySubType;
 import org.bson.types.Binary;
@@ -19,20 +18,13 @@ public class PhotoService {
     private PhotoRepository photoRepo;
 
     public Photo getPhoto(String id) {
-        Optional<Photo> result = photoRepo.findById(id);
-        return result.isPresent() ? result.get() : null;
+        return photoRepo.findById(id).get();
     }
 
-    public String addPhoto(String title, MultipartFile file) {
-        String id = null;
-        try {
+    public String addPhoto(String title, MultipartFile file) throws IOException {
         Photo photo = new Photo(title);
         photo.setImage(new Binary(BsonBinarySubType.BINARY, file.getBytes()));
         photo = photoRepo.insert(photo);
-            id = photo.getId();
-        } catch (IOException e) {
-            return null;
-        }
-        return id;
+        return photo.getId();
     }
 }

persistence-modules/spring-boot-persistence-mongodb/src/main/java/com/baeldung/mongodb/services/VideoService.java

@@ -25,31 +25,19 @@ public class VideoService {
     @Autowired
     private GridFsOperations operations;
 
-    public Video getVideo(String id) {
-        Video video = null;
+    public Video getVideo(String id) throws IllegalStateException, IOException {
         GridFSFile file = gridFsTemplate.findOne(new Query(Criteria.where("_id").is(id)));
-        if (file != null) {
-            video = new Video();
+        Video video = new Video();
         video.setTitle(file.getMetadata().get("title").toString());
-            try {
         video.setStream(operations.getResource(file).getInputStream());
-            } catch (IOException e) {
-                return null;
-            }
-        }
         return video;
     }
 
-    public String addVideo(String title, MultipartFile file) {
+    public String addVideo(String title, MultipartFile file) throws IOException {
         DBObject metaData = new BasicDBObject();
         metaData.put("type", "video");
         metaData.put("title", title);
-        ObjectId id;
-        try {
-            id = gridFsTemplate.store(file.getInputStream(), file.getName(), file.getContentType(), metaData);
-        } catch (IOException e) {
-            return null;
-        }
+        ObjectId id = gridFsTemplate.store(file.getInputStream(), file.getName(), file.getContentType(), metaData);
         return id.toString();
     }
 

persistence-modules/spring-boot-persistence-mongodb/src/main/java/com/baeldung/mongodb/web/PhotoController.java

@@ -1,5 +1,6 @@
 package com.baeldung.mongodb.web;
 
+import java.io.IOException;
 import java.util.Base64;
 
 import org.springframework.beans.factory.annotation.Autowired;
@@ -23,14 +24,10 @@ public class PhotoController {
     @GetMapping("/photos/{id}")
     public String getPhoto(@PathVariable String id, Model model) {
         Photo photo = photoService.getPhoto(id);
-        if (photo != null) {
         model.addAttribute("title", photo.getTitle());
         model.addAttribute("image", Base64.getEncoder().encodeToString(photo.getImage().getData()));
         return "photos";
     }
-        model.addAttribute("message", "Photo not found");
-        return "index";
-    }
 
     @GetMapping("/photos/upload")
     public String uploadPhoto(Model model) {
@@ -39,12 +36,8 @@ public class PhotoController {
     }
 
     @PostMapping("/photos/add")
-    public String addPhoto(@RequestParam("title") String title, @RequestParam("image") MultipartFile image, Model model) {
+    public String addPhoto(@RequestParam("title") String title, @RequestParam("image") MultipartFile image, Model model) throws IOException {
         String id = photoService.addPhoto(title, image);
-        if (id == null) {
-            model.addAttribute("message", "Error Occurred");
-            return "index";
-        }
         return "redirect:/photos/" + id;
     }
 }

persistence-modules/spring-boot-persistence-mongodb/src/main/java/com/baeldung/mongodb/web/VideoController.java

@@ -24,29 +24,17 @@ public class VideoController {
     private VideoService videoService;
 
     @GetMapping("/videos/{id}")
-    public String getVideo(@PathVariable String id, Model model) {
+    public String getVideo(@PathVariable String id, Model model) throws IllegalStateException, IOException {
         Video video = videoService.getVideo(id);
-        if (video != null) {
         model.addAttribute("title", video.getTitle());
         model.addAttribute("url", "/videos/stream/" + id);
         return "videos";
     }
-        model.addAttribute("message", "Video not found");
-        return "index";
-    }
 
     @GetMapping("/videos/stream/{id}")
-    public void streamVideo(@PathVariable String id, HttpServletResponse response) {
+    public void streamVideo(@PathVariable String id, HttpServletResponse response) throws IllegalStateException, IOException {
         Video video = videoService.getVideo(id);
-        if (video != null) {
-            try {
         FileCopyUtils.copy(video.getStream(), response.getOutputStream());
-            } catch (IOException e) {
-                response.setStatus(500);
-            }
-        } else {
-            response.setStatus(404);
-        }
     }
 
     @GetMapping("/videos/upload")
@@ -56,12 +44,8 @@ public class VideoController {
     }
 
     @PostMapping("/videos/add")
-    public String addVideo(@RequestParam("title") String title, @RequestParam("file") MultipartFile file, Model model) {
+    public String addVideo(@RequestParam("title") String title, @RequestParam("file") MultipartFile file, Model model) throws IOException {
         String id = videoService.addVideo(title, file);
-        if (id == null) {
-            model.addAttribute("message", "Error Occurred");
-            return "index";
-        }
         return "redirect:/videos/" + id;
     }
 }