getMessage refactoring

14 files changed, 77 insertions, 78 deletions

diff --git a/src/main/java/com/juick/server/CommandsManager.java b/src/main/java/com/juick/server/CommandsManager.java
index e564f18e..2eb58188 100644
--- a/src/main/java/com/juick/server/CommandsManager.java
+++ b/src/main/java/com/juick/server/CommandsManager.java
@@ -76,7 +76,7 @@ public class CommandsManager {
     @Inject
     private ImagesService imagesService;
 
-    public CommandResult processCommand(User user, String data, @Nonnull URI attachment) throws Exception {
+    public CommandResult processCommand(@Nonnull User user, String data, @Nonnull URI attachment) throws Exception {
         if (!user.isAnonymous()) {
             userService.updateLastSeen(user);
         }
@@ -126,7 +126,7 @@ public class CommandsManager {
             String fname = String.format("%d.%s", mid, attachmentType);
             imagesService.saveImageWithPreviews(attachmentFName, fname);
         }
-        Message msg = messagesService.getMessage(mid);
+        Message msg = messagesService.getMessage(mid).orElseThrow(IllegalStateException::new);
         subscriptionService.subscribeMessage(msg, user);
 
         applicationEventPublisher.publishEvent(new MessageReadEvent(this, user, msg));
@@ -294,17 +294,17 @@ public class CommandsManager {
     public CommandResult commandRecommend(User user, URI attachment, String... arguments) {
         int mid = NumberUtils.toInt(arguments[0], 0);
         if (mid > 0) {
-            com.juick.Message msg = messagesService.getMessage(mid);
-            if (msg != null) {
-                if (msg.getUser() == user) {
+            Optional<com.juick.Message> msg = messagesService.getMessage(mid);
+            if (msg.isPresent()) {
+                if (msg.get().getUser() == user) {
                     return CommandResult.fromString("You can't recommend your own messages.");
                 }
                 MessagesService.RecommendStatus status = messagesService.recommendMessage(mid, user.getUid());
                 switch (status) {
                     case Added:
-                        applicationEventPublisher.publishEvent(new LikeEvent(this, user, msg,
+                        applicationEventPublisher.publishEvent(new LikeEvent(this, user, msg.get(),
                                 subscriptionService.getUsersSubscribedToUserRecommendations(
-                                        user.getUid(), msg)));
+                                        user.getUid(), msg.get())));
                         return CommandResult.fromString("Message is added to your recommendations");
                     case Deleted:
                         return CommandResult.fromString("Message deleted from your recommendations.");
@@ -356,15 +356,15 @@ public class CommandsManager {
     }
     @UserCommand(pattern = "^(s|u)\\s+#(\\d+)$", help = "S #1234 - subscribe to comments" +
             "\nU #1234 - unsubscribe from comments", patternFlags = Pattern.CASE_INSENSITIVE)
-    public CommandResult commandSubscribeMessage(User user, URI attachment, String... args) {
+    public CommandResult commandSubscribeMessage(@Nonnull User user, URI attachment, String... args) {
         boolean subscribe = args[0].equalsIgnoreCase("s");
         int mid = NumberUtils.toInt(args[1], 0);
-        Message msg = messagesService.getMessage(mid);
-        if (msg != null) {
+        Optional<Message> msg = messagesService.getMessage(mid);
+        if (msg.isPresent()) {
             if (subscribe) {
-                if (subscriptionService.subscribeMessage(msg, user)) {
+                if (subscriptionService.subscribeMessage(msg.get(), user)) {
                     applicationEventPublisher.publishEvent(
-                            new MessageReadEvent(this, user, msg));
+                            new MessageReadEvent(this, user, msg.get()));
                     return CommandResult.fromString("Subscribed");
                 }
             } else {
@@ -406,23 +406,23 @@ public class CommandsManager {
         return CommandResult.fromString("User not found");
     }
     @UserCommand(pattern = "^#(\\d+)(\\+?)$", help = "#1234 - Show message (#1234+ - message with replies)")
-    public CommandResult commandShow(User user, URI attachment, String... arguments) {
+    public CommandResult commandShow(@Nonnull User user, URI attachment, String... arguments) {
         boolean showReplies = arguments[1].length() > 0;
         int mid = NumberUtils.toInt(arguments[0], 0);
         if (mid == 0) {
             return CommandResult.fromString("Error");
         }
-        com.juick.Message msg = messagesService.getMessage(mid);
-        if (msg != null) {
+        Optional<com.juick.Message> msg = messagesService.getMessage(mid);
+        if (msg.isPresent()) {
             if (showReplies) {
                 List<com.juick.Message> replies = messagesService.getReplies(user, mid);
                 applicationEventPublisher.publishEvent(
-                        new MessageReadEvent(this, user, msg));
-                replies.add(0, msg);
+                        new MessageReadEvent(this, user, msg.get()));
+                replies.add(0, msg.get());
                 return CommandResult.fromString(String.join("\n",
                         replies.stream().map(PlainTextFormatter::formatPostSummary).collect(Collectors.toList())));
             }
-            return CommandResult.fromString(PlainTextFormatter.formatPost(msg));
+            return CommandResult.fromString(PlainTextFormatter.formatPost(msg.get()));
         }
         return CommandResult.fromString("Message not found");
     }
@@ -453,9 +453,9 @@ public class CommandsManager {
     @UserCommand(pattern = "^D #(\\d+)$", help = "D #1234 - Delete post", patternFlags = Pattern.CASE_INSENSITIVE)
     public CommandResult commandDeletePost(User user, URI attachment, String... args) {
         int mid = Integer.valueOf(args[0]);
-        Message message = messagesService.getMessage(mid);
-        if (message != null && messagesService.deleteMessage(user.getUid(), mid)) {
-            applicationEventPublisher.publishEvent(new DeleteMessageEvent(this, message));
+        Optional<Message> message = messagesService.getMessage(mid);
+        if (message.isPresent() && messagesService.deleteMessage(user.getUid(), mid)) {
+            applicationEventPublisher.publishEvent(new DeleteMessageEvent(this, message.get()));
             return CommandResult.fromString("Message deleted");
         }
         return CommandResult.fromString("This is not your message");
@@ -494,11 +494,11 @@ public class CommandsManager {
     }
     @UserCommand(pattern = "^(#|\\.)(\\d+)((\\.|\\-|\\/)(\\d+))?\\s([\\s\\S]+)?",
             help = "#1234 *tag *tag2 - edit tags\n#1234 text - reply to message")
-    public CommandResult EditOrReply(User user, @Nonnull URI attachment, String... args) throws Exception {
+    public CommandResult EditOrReply(@Nonnull User user, @Nonnull URI attachment, String... args) throws Exception {
         int mid = NumberUtils.toInt(args[1]);
         int rid = NumberUtils.toInt(args[4], 0);
         String txt = StringUtils.defaultString(args[5]);
-        Message msg = messagesService.getMessage(mid);
+        Message msg = messagesService.getMessage(mid).orElseThrow(IllegalStateException::new);
         Pair<String, List<Tag>> messageTags = tagService.fromString(txt);
         if (messageTags.getRight().size() > 0) {
             if (user.getUid() != msg.getUser().getUid()) {
@@ -528,7 +528,7 @@ public class CommandsManager {
             }
             applicationEventPublisher.publishEvent(
                     new MessageReadEvent(this, user, msg));
-            Message original = messagesService.getMessage(mid);
+            Message original = messagesService.getMessage(mid).orElseThrow(IllegalStateException::new);
             subscriptionService.subscribeMessage(original, user);
             Message reply = messagesService.getReply(mid, newrid);
             applicationEventPublisher.publishEvent(new MessageEvent(this, reply, subscriptionService.getUsersSubscribedToComments(original, reply)));
diff --git a/src/main/java/com/juick/server/EmailManager.java b/src/main/java/com/juick/server/EmailManager.java
index 1cdafac6..af4ed416 100644
--- a/src/main/java/com/juick/server/EmailManager.java
+++ b/src/main/java/com/juick/server/EmailManager.java
@@ -55,7 +55,7 @@ public class EmailManager implements NotificationListener {
                 emailNotify(email, subject, msg);
             });
         } else if (MessageUtils.isReply(msg)) {
-            Message originalMessage = messagesService.getMessage(msg.getMid());
+            Message originalMessage = messagesService.getMessage(msg.getMid()).orElseThrow(IllegalStateException::new);
             String subject = String.format("New reply to %s", originalMessage.getUser().getName());
             subscribedUsers.stream()
                     .flatMap(user -> emailService.getEmails(user.getUid(), true).stream())
@@ -103,7 +103,7 @@ public class EmailManager implements NotificationListener {
                 Message replyto = messagesService.getReply(msg.getMid(), msg.getReplyto());
                 headers.put("In-Reply-To", String.format("<%d.%d@juick.com>", replyto.getMid(), replyto.getRid()));
             } else {
-                Message original = messagesService.getMessage(msg.getMid());
+                Message original = messagesService.getMessage(msg.getMid()).orElseThrow(IllegalStateException::new);
                 headers.put("In-Reply-To", String.format("<%d.%d@juick.com>", original.getMid(), original.getRid()));
             }
         }
diff --git a/src/main/java/com/juick/server/ServerManager.java b/src/main/java/com/juick/server/ServerManager.java
index ef848526..586d5962 100644
--- a/src/main/java/com/juick/server/ServerManager.java
+++ b/src/main/java/com/juick/server/ServerManager.java
@@ -140,7 +140,6 @@ public class ServerManager implements NotificationListener {
         try {
 
             String json = jsonMapper.writeValueAsString(jmsg);
-            com.juick.Message op = messagesService.getMessage(jmsg.getMid());
             List<Integer> threadUsers =
                     subscribedUsers
                             .stream().map(User::getUid).collect(Collectors.toList());
@@ -187,10 +186,10 @@ public class ServerManager implements NotificationListener {
             onJuickPM(jmsg.getTo(), jmsg);
         } else if (!MessageUtils.isReply(jmsg)) {
             // to get full message with attachment, etc.
-            onJuickMessagePost(messagesService.getMessage(jmsg.getMid()), subscribedUsers);
+            onJuickMessagePost(messagesService.getMessage(jmsg.getMid()).orElseThrow(IllegalStateException::new), subscribedUsers);
         } else {
             // to get quote and attachment
-            Message op = messagesService.getMessage(jmsg.getMid());
+            Message op = messagesService.getMessage(jmsg.getMid()).orElseThrow(IllegalStateException::new);
             com.juick.Message reply = messagesService.getReply(jmsg.getMid(), jmsg.getRid());
             subscriptionService.getUsersSubscribedToComments(op, reply, true).stream()
                     .filter(u -> userService.isReplyToBL(u, reply))
diff --git a/src/main/java/com/juick/server/TelegramBotManager.java b/src/main/java/com/juick/server/TelegramBotManager.java
index 8e8d0104..82114fb5 100644
--- a/src/main/java/com/juick/server/TelegramBotManager.java
+++ b/src/main/java/com/juick/server/TelegramBotManager.java
@@ -349,7 +349,6 @@ public class TelegramBotManager implements NotificationListener {
             telegramService.getTelegramIdentifiers(Collections.singletonList(jmsg.getTo()))
                     .forEach(c -> telegramNotify(c, formatPost(jmsg, true), jmsg));
         } else if (MessageUtils.isReply(jmsg)) {
-            com.juick.Message op = messagesService.getMessage(jmsg.getMid());
             String fmsg = String.format("[%s](%s) %s", MSG_LINK, msgUrl, formatPost(jmsg, true));
             telegramService.getTelegramIdentifiers(
                     subscribedUsers
diff --git a/src/main/java/com/juick/server/TopManager.java b/src/main/java/com/juick/server/TopManager.java
index e5c00242..fe3d605d 100644
--- a/src/main/java/com/juick/server/TopManager.java
+++ b/src/main/java/com/juick/server/TopManager.java
@@ -42,7 +42,7 @@ public class TopManager {
     @Scheduled(fixedRate = 3600000)
     public void updateTop() {
         messagesService.getPopularCandidates().forEach(m -> {
-            Message jmsg = messagesService.getMessage(m);
+            Message jmsg = messagesService.getMessage(m).orElseThrow(IllegalStateException::new);
             logger.info("added {} to popular", m);
             messagesService.setMessagePopular(m, 1);
             List<String> tags = jmsg.getTags().stream().map(Tag::getName).map(String::toLowerCase).collect(Collectors.toList());
diff --git a/src/main/java/com/juick/server/XMPPConnection.java b/src/main/java/com/juick/server/XMPPConnection.java
index 5ea105af..0adc7796 100644
--- a/src/main/java/com/juick/server/XMPPConnection.java
+++ b/src/main/java/com/juick/server/XMPPConnection.java
@@ -288,7 +288,7 @@ public class XMPPConnection implements StanzaListener, NotificationListener {
         for (User user : users) {
             jids.addAll(userService.getJIDsbyUID(user.getUid()));
         }
-        com.juick.Message fullMsg = messagesService.getMessage(jmsg.getMid());
+        com.juick.Message fullMsg = messagesService.getMessage(jmsg.getMid()).orElseThrow(IllegalStateException::new);
         String txt = "@" + jmsg.getUser().getName() + ":" + MessageUtils.getTagsString(fullMsg) + "\n";
         String attachmentUrl = MessageUtils.attachmentUrl(fullMsg);
         if (StringUtils.isNotEmpty(attachmentUrl)) {
@@ -325,7 +325,7 @@ public class XMPPConnection implements StanzaListener, NotificationListener {
         String replyTo;
 
         com.juick.Message replyMessage = jmsg.getReplyto() > 0 ? messagesService.getReply(jmsg.getMid(), jmsg.getReplyto())
-                : messagesService.getMessage(jmsg.getMid());
+                : messagesService.getMessage(jmsg.getMid()).orElseThrow(IllegalStateException::new);
         replyTo = replyMessage.getUser().getName();
         com.juick.Message fullReply = messagesService.getReply(jmsg.getMid(), jmsg.getRid());
         replyQuote = StringUtils.defaultString(fullReply.getReplyQuote());
@@ -594,13 +594,14 @@ public class XMPPConnection implements StanzaListener, NotificationListener {
             if (jmsg != null) {
                 if (MessageUtils.isReply(jmsg)) {
                     // to get quote and attachment
-                    com.juick.Message original = messagesService.getMessage(jmsg.getMid());
+                    com.juick.Message original = messagesService.getMessage(jmsg.getMid()).orElseThrow(IllegalStateException::new);
                     com.juick.Message reply = messagesService.getReply(jmsg.getMid(), jmsg.getRid());
                     applicationEventPublisher.publishEvent(new MessageEvent(this, reply,
                             subscriptionService.getUsersSubscribedToComments(original, reply)));
                 } else if (!MessageUtils.isPM(jmsg)) {
                     applicationEventPublisher.publishEvent(new MessageEvent(this,
-                            messagesService.getMessage(jmsg.getMid()), subscriptionService.getSubscribedUsers(jmsg.getUser().getUid(), jmsg)));
+                            messagesService.getMessage(jmsg.getMid()).orElseThrow(IllegalStateException::new),
+                            subscriptionService.getSubscribedUsers(jmsg.getUser().getUid(), jmsg)));
                 }
             } else {
                 URI attachment = URI.create(StringUtils.EMPTY);
diff --git a/src/main/java/com/juick/server/api/Messages.java b/src/main/java/com/juick/server/api/Messages.java
index 4f0009dd..f7485d55 100644
--- a/src/main/java/com/juick/server/api/Messages.java
+++ b/src/main/java/com/juick/server/api/Messages.java
@@ -39,10 +39,7 @@ import org.springframework.web.bind.annotation.*;
 
 import javax.inject.Inject;
 import java.io.IOException;
-import java.util.Collections;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Objects;
+import java.util.*;
 
 /**
  * @author ugnich
@@ -163,8 +160,9 @@ public class Messages {
     public ResponseEntity<List<com.juick.Message>> getThread(
             @RequestParam(defaultValue = "0") int mid) {
         User visitor = UserUtils.getCurrentUser();
-        com.juick.Message msg = messagesService.getMessage(mid);
-        if (msg != null) {
+        Optional<Message> message = messagesService.getMessage(mid);
+        if (message.isPresent()) {
+            Message msg = message.get();
             if (!messagesService.canViewThread(mid, visitor.getUid())) {
                 return FORBIDDEN;
             } else {
@@ -189,7 +187,7 @@ public class Messages {
         User visitor = UserUtils.getCurrentUser();
         if (!visitor.isAnonymous()) {
             messagesService.setLastReadComment(visitor, mid, rid);
-            Message msg = messagesService.getMessage(mid);
+            Message msg = messagesService.getMessage(mid).orElseThrow(IllegalStateException::new);
             userService.updateLastSeen(visitor);
             applicationEventPublisher.publishEvent(
                     new MessageReadEvent(this, visitor, msg));
diff --git a/src/main/java/com/juick/server/api/Notifications.java b/src/main/java/com/juick/server/api/Notifications.java
index 62275f5a..2971a07d 100644
--- a/src/main/java/com/juick/server/api/Notifications.java
+++ b/src/main/java/com/juick/server/api/Notifications.java
@@ -82,26 +82,23 @@ public class Notifications {
         } else {
             if (mid > 0) {
                 // reply
-                Message msg = messagesService.getMessage(mid);
-                if (msg != null) {
-                    List<User> users;
-                    if (rid > 0) {
-                        Message op = messagesService.getMessage(mid);
-                        Message reply = messagesService.getReply(mid, rid);
-                        users = subscriptionService.getUsersSubscribedToComments(op, reply);
-                    } else {
-                        users = subscriptionService.getSubscribedUsers(msg.getUser().getUid(), msg);
-                    }
-
-                    return ResponseEntity.ok(users.stream().map(User::getUid)
-                            .map(this::collectTokens).collect(Collectors.toList()));
+                Message msg = messagesService.getMessage(mid).orElseThrow(IllegalStateException::new);
+                List<User> users;
+                if (rid > 0) {
+                    Message op = messagesService.getMessage(mid).orElseThrow(IllegalStateException::new);
+                    Message reply = messagesService.getReply(mid, rid);
+                    users = subscriptionService.getUsersSubscribedToComments(op, reply);
+                } else {
+                    users = subscriptionService.getSubscribedUsers(msg.getUser().getUid(), msg);
                 }
+
+                return ResponseEntity.ok(users.stream().map(User::getUid)
+                        .map(this::collectTokens).collect(Collectors.toList()));
             } else {
                 // read
                 return ResponseEntity.ok(Collections.singletonList(collectTokens(uid)));
             }
         }
-        throw new HttpBadRequestException();
     }
 
     @ApiIgnore
diff --git a/src/main/java/com/juick/server/api/Post.java b/src/main/java/com/juick/server/api/Post.java
index 2c7346b3..d49ec332 100644
--- a/src/main/java/com/juick/server/api/Post.java
+++ b/src/main/java/com/juick/server/api/Post.java
@@ -41,6 +41,7 @@ import javax.validation.constraints.NotNull;
 import java.net.URI;
 import java.net.URL;
 import java.util.List;
+import java.util.Optional;
 
 /**
  * Created by vt on 24/11/2016.
@@ -114,11 +115,13 @@ public class Post {
         if (mid == 0) {
             throw new HttpBadRequestException();
         }
-        com.juick.Message msg = messagesService.getMessage(mid);
-        if (msg == null) {
+        Optional<Message> message = messagesService.getMessage(mid);
+        if (!message.isPresent()) {
             throw new HttpNotFoundException();
         }
 
+        Message msg = message.get();
+
         com.juick.Message reply = null;
         if (rid > 0) {
             reply = messagesService.getReply(mid, rid);
@@ -158,10 +161,11 @@ public class Post {
         if (visitor.isAnonymous()) {
             throw new HttpForbiddenException();
         }
-        com.juick.Message msg = messagesService.getMessage(mid);
-        if (msg == null) {
+        Optional<com.juick.Message> message = messagesService.getMessage(mid);
+        if (!message.isPresent()) {
             throw new HttpNotFoundException();
         }
+        Message msg = message.get();
         if (msg.getUser().getUid() == visitor.getUid()) {
             throw new HttpForbiddenException();
         }
@@ -177,10 +181,11 @@ public class Post {
         if (visitor.isAnonymous()) {
             throw new HttpForbiddenException();
         }
-        com.juick.Message msg = messagesService.getMessage(mid);
-        if (msg == null) {
+        Optional<com.juick.Message> message = messagesService.getMessage(mid);
+        if (!message.isPresent()) {
             throw new HttpNotFoundException();
         }
+        Message msg = message.get();
         if (msg.getUser().getUid() == visitor.getUid()) {
             throw new HttpForbiddenException();
         }
@@ -205,10 +210,11 @@ public class Post {
         if (visitor.isAnonymous()) {
             throw new HttpForbiddenException();
         }
-        com.juick.Message msg = messagesService.getMessage(mid);
-        if (msg == null) {
+        Optional<com.juick.Message> message = messagesService.getMessage(mid);
+        if (!message.isPresent()) {
             throw new HttpNotFoundException();
         }
+        Message msg = message.get();
         if (msg.getUser().getUid() == visitor.getUid()) {
             throw new HttpForbiddenException();
         }
@@ -228,7 +234,7 @@ public class Post {
         User author = rid == 0 ? messagesService.getMessageAuthor(mid) : messagesService.getReply(mid, rid).getUser();
         if (visitor.equals(author)) {
             if (messagesService.updateMessage(mid, rid, body)) {
-                Message result = rid == 0 ? messagesService.getMessage(mid) : messagesService.getReply(mid, rid);
+                Message result = rid == 0 ? messagesService.getMessage(mid).orElseThrow(IllegalStateException::new) : messagesService.getReply(mid, rid);
                 return CommandResult.build(result, "Message updated", StringUtils.EMPTY);
             }
             throw new HttpBadRequestException();
diff --git a/src/main/java/com/juick/server/api/activity/Profile.java b/src/main/java/com/juick/server/api/activity/Profile.java
index 10390ea1..f4160eab 100644
--- a/src/main/java/com/juick/server/api/activity/Profile.java
+++ b/src/main/java/com/juick/server/api/activity/Profile.java
@@ -250,7 +250,7 @@ public class Profile {
                     messagesService.getReply(mid, rid)));
         }
         return Context.build(activityPubManager.makeNote(
-                messagesService.getMessage(mid)));
+                messagesService.getMessage(mid).orElseThrow(IllegalStateException::new)));
     }
 
     @PostMapping(value = "/api/inbox", consumes = {Context.LD_JSON_MEDIA_TYPE, Context.ACTIVITYSTREAMS_PROFILE_MEDIA_TYPE})
diff --git a/src/main/java/com/juick/server/www/controllers/MessagesWWW.java b/src/main/java/com/juick/server/www/controllers/MessagesWWW.java
index 0708e27f..77ee6e15 100644
--- a/src/main/java/com/juick/server/www/controllers/MessagesWWW.java
+++ b/src/main/java/com/juick/server/www/controllers/MessagesWWW.java
@@ -496,12 +496,14 @@ public class MessagesWWW {
             throw new HttpForbiddenException();
         }
 
-        com.juick.Message msg = messagesService.getMessage(mid);
+        Optional<com.juick.Message> message = messagesService.getMessage(mid);
 
-        if (msg == null || msg.getUser().isBanned()) {
+        if (!message.isPresent() || message.get().getUser().isBanned()) {
             throw new HttpNotFoundException();
         }
 
+        Message msg = message.get();
+
         com.juick.User user = userService.getUserByName(uname);
         if (user.isAnonymous() || !msg.getUser().equals(user)) {
             return String.format("redirect:/%s/%d", msg.getUser().getName(), mid);
diff --git a/src/main/java/com/juick/service/MessagesService.java b/src/main/java/com/juick/service/MessagesService.java
index 362501b5..fb2b3d95 100644
--- a/src/main/java/com/juick/service/MessagesService.java
+++ b/src/main/java/com/juick/service/MessagesService.java
@@ -23,10 +23,7 @@ import com.juick.User;
 import com.juick.model.ResponseReply;
 
 import java.net.URI;
-import java.util.Collection;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
+import java.util.*;
 
 /**
  * Created by aalexeev on 11/13/16.
@@ -63,7 +60,7 @@ public interface MessagesService {
 
     int getMessagePrivacy(int mid);
 
-    com.juick.Message getMessage(int mid);
+    Optional<Message> getMessage(int mid);
 
     com.juick.Message getReply(int mid, int rid);
 
diff --git a/src/main/java/com/juick/service/MessagesServiceImpl.java b/src/main/java/com/juick/service/MessagesServiceImpl.java
index efe480c0..145d42c3 100644
--- a/src/main/java/com/juick/service/MessagesServiceImpl.java
+++ b/src/main/java/com/juick/service/MessagesServiceImpl.java
@@ -343,7 +343,7 @@ public class MessagesServiceImpl extends BaseJdbcService implements MessagesServ
 
     @Transactional(readOnly = true)
     @Override
-    public com.juick.Message getMessage(final int mid) {
+    public Optional<com.juick.Message> getMessage(final int mid) {
 
         List<com.juick.Message> list = getJdbcTemplate().query(
                 "SELECT messages.message_id as mid, 0 as rid, 0 as replyto, "
@@ -369,9 +369,9 @@ public class MessagesServiceImpl extends BaseJdbcService implements MessagesServ
             Map<Integer, Set<Reaction>> reactionStats = updateReactionsFor(Collections.singletonList(mid));
             message.setReactions(reactionStats.get(message.getMid()));
             message.setEntities(MessageUtils.getEntities(message));
-            return message;
+            return Optional.of(message);
         }
-        return null;
+        return Optional.empty();
     }
 
     @Transactional(readOnly = true)
diff --git a/src/main/java/com/juick/service/component/MessageReadEvent.java b/src/main/java/com/juick/service/component/MessageReadEvent.java
index b070c8cb..b2af4a08 100644
--- a/src/main/java/com/juick/service/component/MessageReadEvent.java
+++ b/src/main/java/com/juick/service/component/MessageReadEvent.java
@@ -4,7 +4,7 @@ import com.juick.Message;
 import com.juick.User;
 import org.springframework.context.ApplicationEvent;
 
-import java.util.List;
+import javax.annotation.Nonnull;
 
 public class MessageReadEvent extends ApplicationEvent {
     private User user;
@@ -14,7 +14,7 @@ public class MessageReadEvent extends ApplicationEvent {
      *
      * @param source the object on which the event initially occurred (never {@code null})
      */
-    public MessageReadEvent(Object source, User user, Message message) {
+    public MessageReadEvent(Object source, @Nonnull User user, Message message) {
         super(source);
         this.user = user;
         this.message = message;