StringUtils.EMPTY

18 files changed, 54 insertions, 41 deletions

diff --git a/juick-server/src/main/java/com/juick/configuration/DataConfiguration.java b/juick-server/src/main/java/com/juick/configuration/DataConfiguration.java
index efee4731..4258703d 100644
--- a/juick-server/src/main/java/com/juick/configuration/DataConfiguration.java
+++ b/juick-server/src/main/java/com/juick/configuration/DataConfiguration.java
@@ -3,6 +3,7 @@ package com.juick.configuration;
 import com.juick.database.MySqlUpdater;
 import com.juick.service.search.SearchService;
 import org.apache.commons.dbcp2.BasicDataSource;
+import org.apache.commons.lang3.StringUtils;
 import org.springframework.context.annotation.*;
 import org.springframework.core.env.Environment;
 import org.springframework.jdbc.core.JdbcTemplate;
@@ -34,8 +35,8 @@ public class DataConfiguration implements TransactionManagementConfigurer {
 
         dataSource.setDriverClassName(env.getProperty("datasource_driver", "com.mysql.jdbc.Driver"));
         dataSource.setUrl(env.getProperty("datasource_url"));
-        dataSource.setUsername(env.getProperty("datasource_user", ""));
-        dataSource.setPassword(env.getProperty("datasource_password", ""));
+        dataSource.setUsername(env.getProperty("datasource_user", StringUtils.EMPTY));
+        dataSource.setPassword(env.getProperty("datasource_password", StringUtils.EMPTY));
 
         dataSource.setValidationQuery("select 1");
 
diff --git a/juick-server/src/main/java/com/juick/configuration/SearchConfiguration.java b/juick-server/src/main/java/com/juick/configuration/SearchConfiguration.java
index 5f04ea4e..e6b446b6 100644
--- a/juick-server/src/main/java/com/juick/configuration/SearchConfiguration.java
+++ b/juick-server/src/main/java/com/juick/configuration/SearchConfiguration.java
@@ -3,6 +3,7 @@ package com.juick.configuration;
 import com.juick.service.search.SearchService;
 import com.juick.service.search.SphinxSearchServiceImpl;
 import org.apache.commons.dbcp2.BasicDataSource;
+import org.apache.commons.lang3.StringUtils;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.DependsOn;
@@ -28,8 +29,8 @@ public class SearchConfiguration {
 
         dataSource.setDriverClassName(env.getProperty("sphinx_driver", "com.mysql.jdbc.Driver"));
         dataSource.setUrl(env.getProperty("sphinx_url"));
-        dataSource.setUsername(env.getProperty("sphinx_user", ""));
-        dataSource.setPassword(env.getProperty("sphinx_password", ""));
+        dataSource.setUsername(env.getProperty("sphinx_user", StringUtils.EMPTY));
+        dataSource.setPassword(env.getProperty("sphinx_password", StringUtils.EMPTY));
 
         return dataSource;
     }
diff --git a/juick-server/src/main/java/com/juick/server/CrosspostQueries.java b/juick-server/src/main/java/com/juick/server/CrosspostQueries.java
index 827dad09..9d0b5f4c 100644
--- a/juick-server/src/main/java/com/juick/server/CrosspostQueries.java
+++ b/juick-server/src/main/java/com/juick/server/CrosspostQueries.java
@@ -18,6 +18,7 @@
 package com.juick.server;
 
 import com.juick.server.helpers.ApplicationStatus;
+import org.apache.commons.lang3.StringUtils;
 import org.apache.commons.lang3.tuple.Pair;
 import org.springframework.dao.EmptyResultDataAccessException;
 import org.springframework.jdbc.core.JdbcTemplate;
@@ -64,7 +65,7 @@ public class CrosspostQueries {
         try {
             return sql.queryForObject("SELECT uname FROM twitter WHERE user_id=?", String.class, uid);
         } catch (EmptyResultDataAccessException e) {
-            return "";
+            return StringUtils.EMPTY;
         }
     }
 
@@ -72,7 +73,7 @@ public class CrosspostQueries {
         try {
             return sql.queryForObject("SELECT tg_name FROM telegram WHERE user_id=?", String.class, uid);
         } catch (EmptyResultDataAccessException e) {
-            return "";
+            return StringUtils.EMPTY;
         }
     }
 
diff --git a/juick-server/src/main/java/com/juick/server/MessagesQueries.java b/juick-server/src/main/java/com/juick/server/MessagesQueries.java
index cac36979..f3de1f9b 100644
--- a/juick-server/src/main/java/com/juick/server/MessagesQueries.java
+++ b/juick-server/src/main/java/com/juick/server/MessagesQueries.java
@@ -101,8 +101,8 @@ public class MessagesQueries {
 
         if (mid > 0) {
 
-            String tagsNames = "";
-            String tagsIDs = "";
+            String tagsNames = org.apache.commons.lang3.StringUtils.EMPTY;
+            String tagsIDs = org.apache.commons.lang3.StringUtils.EMPTY;
 
             for (int i = 0; i < tags.size(); i++) {
                 if (i > 0) {
diff --git a/juick-server/src/main/java/com/juick/server/UserQueries.java b/juick-server/src/main/java/com/juick/server/UserQueries.java
index e91cb6b3..7a669230 100644
--- a/juick-server/src/main/java/com/juick/server/UserQueries.java
+++ b/juick-server/src/main/java/com/juick/server/UserQueries.java
@@ -241,7 +241,7 @@ public class UserQueries {
         if (sql.update("INSERT INTO mail(user_id,hash) VALUES (?,?) ON DUPLICATE KEY UPDATE hash=?", user.getUid(), newHash, newHash) > 0) {
             return newHash;
         }
-        return "";
+        return org.apache.commons.lang3.StringUtils.EMPTY;
     }
 
     public static int getUserOptionInt(JdbcTemplate sql, int uid, String option, int defaultValue) {
@@ -481,7 +481,7 @@ public class UserQueries {
             return sql.queryForObject("SELECT hash FROM mail WHERE user_id=?", String.class, user.getUid())
                     + "@mail.juick.com";
         } catch (EmptyResultDataAccessException e) {
-            return "";
+            return org.apache.commons.lang3.StringUtils.EMPTY;
         }
     }
 }
diff --git a/juick-server/src/main/java/com/juick/server/protocol/JuickProtocol.java b/juick-server/src/main/java/com/juick/server/protocol/JuickProtocol.java
index a024a0eb..cd7a4bc1 100644
--- a/juick-server/src/main/java/com/juick/server/protocol/JuickProtocol.java
+++ b/juick-server/src/main/java/com/juick/server/protocol/JuickProtocol.java
@@ -8,6 +8,7 @@ import com.juick.server.helpers.TagStats;
 import com.juick.server.protocol.annotation.UserCommand;
 import com.juick.service.*;
 import com.juick.util.TagUtils;
+import org.apache.commons.lang3.StringUtils;
 import org.apache.commons.lang3.math.NumberUtils;
 
 import javax.inject.Inject;
@@ -110,7 +111,7 @@ public class JuickProtocol {
         bltags = tagService.getUserBLTags(user_from.getUid());
 
 
-        String txt = "";
+        String txt = StringUtils.EMPTY;
         if (bltags.size() > 0) {
             for (String bltag : bltags) {
                 txt += "*" + bltag + "\n";
diff --git a/juick-server/src/main/java/com/juick/server/protocol/annotation/UserCommand.java b/juick-server/src/main/java/com/juick/server/protocol/annotation/UserCommand.java
index af7c4924..42a9bb59 100644
--- a/juick-server/src/main/java/com/juick/server/protocol/annotation/UserCommand.java
+++ b/juick-server/src/main/java/com/juick/server/protocol/annotation/UserCommand.java
@@ -1,5 +1,7 @@
 package com.juick.server.protocol.annotation;
 
+import org.apache.commons.lang3.StringUtils;
+
 import java.lang.annotation.ElementType;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
@@ -15,7 +17,7 @@ public @interface UserCommand {
      *
      * @return a command pattern
      */
-    String pattern() default "";
+    String pattern() default StringUtils.EMPTY;
 
     /**
      *
@@ -27,5 +29,5 @@ public @interface UserCommand {
      *
      * @return a string used in HELP command output. Basically, only 1 string
      */
-    String help() default "";
+    String help() default StringUtils.EMPTY;
 }
diff --git a/juick-server/src/main/java/com/juick/server/util/HttpBadRequestException.java b/juick-server/src/main/java/com/juick/server/util/HttpBadRequestException.java
index 5c0593ec..1ba1aecb 100644
--- a/juick-server/src/main/java/com/juick/server/util/HttpBadRequestException.java
+++ b/juick-server/src/main/java/com/juick/server/util/HttpBadRequestException.java
@@ -1,5 +1,6 @@
 package com.juick.server.util;
 
+import org.apache.commons.lang3.StringUtils;
 import org.springframework.http.HttpStatus;
 import org.springframework.web.bind.annotation.ResponseStatus;
 
@@ -9,6 +10,6 @@ import org.springframework.web.bind.annotation.ResponseStatus;
 @ResponseStatus(value = HttpStatus.BAD_REQUEST)
 public class HttpBadRequestException extends RuntimeException {
     public HttpBadRequestException() {
-        super("", null, false, false);
+        super(StringUtils.EMPTY, null, false, false);
     }
 }
diff --git a/juick-server/src/main/java/com/juick/server/util/HttpForbiddenException.java b/juick-server/src/main/java/com/juick/server/util/HttpForbiddenException.java
index a1004b41..733453ba 100644
--- a/juick-server/src/main/java/com/juick/server/util/HttpForbiddenException.java
+++ b/juick-server/src/main/java/com/juick/server/util/HttpForbiddenException.java
@@ -1,5 +1,6 @@
 package com.juick.server.util;
 
+import org.apache.commons.lang3.StringUtils;
 import org.springframework.http.HttpStatus;
 import org.springframework.web.bind.annotation.ResponseStatus;
 
@@ -9,7 +10,7 @@ import org.springframework.web.bind.annotation.ResponseStatus;
 @ResponseStatus(value = HttpStatus.FORBIDDEN)
 public class HttpForbiddenException extends RuntimeException {
     public HttpForbiddenException() {
-        super("", null, false, false);
+        super(StringUtils.EMPTY, null, false, false);
     }
 
 }
diff --git a/juick-server/src/main/java/com/juick/server/util/HttpNotFoundException.java b/juick-server/src/main/java/com/juick/server/util/HttpNotFoundException.java
index fd0f1cb0..942d90e2 100644
--- a/juick-server/src/main/java/com/juick/server/util/HttpNotFoundException.java
+++ b/juick-server/src/main/java/com/juick/server/util/HttpNotFoundException.java
@@ -1,5 +1,6 @@
 package com.juick.server.util;
 
+import org.apache.commons.lang3.StringUtils;
 import org.springframework.http.HttpStatus;
 import org.springframework.web.bind.annotation.ResponseStatus;
 
@@ -9,6 +10,6 @@ import org.springframework.web.bind.annotation.ResponseStatus;
 @ResponseStatus(value = HttpStatus.NOT_FOUND)
 public class HttpNotFoundException extends RuntimeException {
     public HttpNotFoundException() {
-        super("", null, false, false);
+        super(StringUtils.EMPTY, null, false, false);
     }
 }
diff --git a/juick-server/src/main/java/com/juick/server/util/HttpUtils.java b/juick-server/src/main/java/com/juick/server/util/HttpUtils.java
index fa0b2ec2..e54bef87 100644
--- a/juick-server/src/main/java/com/juick/server/util/HttpUtils.java
+++ b/juick-server/src/main/java/com/juick/server/util/HttpUtils.java
@@ -18,6 +18,7 @@
 package com.juick.server.util;
 
 import org.apache.commons.codec.digest.DigestUtils;
+import org.apache.commons.lang3.StringUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.web.multipart.MultipartFile;
@@ -58,7 +59,7 @@ public class HttpUtils {
                 }
             }
         }
-        return "";
+        return StringUtils.EMPTY;
     }
     public static String downloadImage(URL url) throws Exception {
         String attachmentFName = null;
diff --git a/juick-server/src/main/java/com/juick/service/CrosspostServiceImpl.java b/juick-server/src/main/java/com/juick/service/CrosspostServiceImpl.java
index 0f043292..df748526 100644
--- a/juick-server/src/main/java/com/juick/service/CrosspostServiceImpl.java
+++ b/juick-server/src/main/java/com/juick/service/CrosspostServiceImpl.java
@@ -1,6 +1,7 @@
 package com.juick.service;
 
 import com.juick.server.helpers.ApplicationStatus;
+import org.apache.commons.lang3.StringUtils;
 import org.apache.commons.lang3.tuple.Pair;
 import org.springframework.jdbc.core.JdbcTemplate;
 import org.springframework.stereotype.Repository;
@@ -96,7 +97,7 @@ public class CrosspostServiceImpl extends BaseJdbcService implements CrosspostSe
                 uid);
 
         return list.isEmpty() ?
-                "" : list.get(0);
+                StringUtils.EMPTY : list.get(0);
     }
 
     @Transactional(readOnly = true)
@@ -108,7 +109,7 @@ public class CrosspostServiceImpl extends BaseJdbcService implements CrosspostSe
                 uid);
 
         return list.isEmpty() ?
-                "" : list.get(0);
+                StringUtils.EMPTY : list.get(0);
     }
 
     @Transactional(readOnly = true)
diff --git a/juick-server/src/main/java/com/juick/service/MessagesServiceImpl.java b/juick-server/src/main/java/com/juick/service/MessagesServiceImpl.java
index 88167be8..1ad29d00 100644
--- a/juick-server/src/main/java/com/juick/service/MessagesServiceImpl.java
+++ b/juick-server/src/main/java/com/juick/service/MessagesServiceImpl.java
@@ -107,7 +107,7 @@ public class MessagesServiceImpl extends BaseJdbcService implements MessagesServ
         int mid = holder.getKey().intValue();
 
         if (mid > 0) {
-            String tagsNames = "";
+            String tagsNames = StringUtils.EMPTY;
 
             if (CollectionUtils.isNotEmpty(tags)) {
                 StringBuilder tasNamesBuilder = new StringBuilder();
@@ -364,7 +364,7 @@ public class MessagesServiceImpl extends BaseJdbcService implements MessagesServ
         return getNamedParameterJdbcTemplate().queryForList(
                 "SELECT m.message_id FROM messages m WHERE " +
                         (before > 0 ?
-                                " m.message_id < :before AND " : "") +
+                                " m.message_id < :before AND " : StringUtils.EMPTY) +
                         " m.hidden = 0 AND (m.privacy > 0" +
                         (visitorUid > 1 ?
                                 " OR m.user_id = :visitorUid) AND NOT EXISTS (" +
@@ -389,7 +389,7 @@ public class MessagesServiceImpl extends BaseJdbcService implements MessagesServ
                         "ON ((tags.synonym_id = :tid OR tags.tag_id = :tid) AND tags.tag_id = messages_tags.tag_id)) " +
                         "INNER JOIN messages USING(message_id) WHERE " +
                         (before > 0 ?
-                                " messages.message_id < :before AND " : "") +
+                                " messages.message_id < :before AND " : StringUtils.EMPTY) +
                         "(messages.privacy > 0 OR messages.user_id = :visitorUid) ORDER BY message_id DESC LIMIT :cnt",
                 sqlParameterSource,
                 Integer.class);
@@ -407,7 +407,7 @@ public class MessagesServiceImpl extends BaseJdbcService implements MessagesServ
                 "SELECT messages.message_id FROM messages_tags " +
                         "INNER JOIN messages USING(message_id) WHERE messages_tags.tag_id IN (" + tids + ") " +
                         (before > 0 ?
-                                " AND messages.message_id < :before " : "") +
+                                " AND messages.message_id < :before " : StringUtils.EMPTY) +
                         " AND (messages.privacy > 0 OR messages.user_id = :visitorUid) " +
                         "ORDER BY messages.message_id DESC LIMIT :cnt",
                 sqlParameterSource,
@@ -425,7 +425,7 @@ public class MessagesServiceImpl extends BaseJdbcService implements MessagesServ
         return getNamedParameterJdbcTemplate().queryForList(
                 "SELECT message_id FROM messages WHERE place_id = :placeId " +
                         (before > 0 ?
-                                " AND message_id < :before " : "") +
+                                " AND message_id < :before " : StringUtils.EMPTY) +
                         " AND (privacy > 0 OR user_id = :visitorUid) ORDER BY message_id DESC LIMIT 20",
                 sqlParameterSource,
                 Integer.class);
@@ -443,13 +443,13 @@ public class MessagesServiceImpl extends BaseJdbcService implements MessagesServ
                         " INNER JOIN subscr_users ON (subscr_users.suser_id = :uid AND subscr_users.user_id = messages.user_id) " +
                         " WHERE " +
                         (before > 0 ?
-                                " message_id < :before AND " : "") +
+                                " message_id < :before AND " : StringUtils.EMPTY) +
                         " (privacy >= 0 OR (privacy >= -2 AND privacy <= -1" +
                         " AND EXISTS (SELECT 1 FROM wl_users w WHERE w.wl_user_id = :uid and w.user_id = messages.user_id)))) " +
                         " UNION " +
                         " (SELECT message_id FROM messages WHERE user_id=:uid " +
                         (before > 0 ?
-                                " AND message_id < :before " : "") +
+                                " AND message_id < :before " : StringUtils.EMPTY) +
                         ") ORDER BY message_id DESC LIMIT 20",
                 sqlParameterSource,
                 Integer.class);
@@ -467,7 +467,7 @@ public class MessagesServiceImpl extends BaseJdbcService implements MessagesServ
         return getNamedParameterJdbcTemplate().queryForList
                 ("SELECT message_id FROM messages WHERE user_id = :uid AND privacy < 0" +
                                 (before > 0 ?
-                                        " AND message_id < :before " : "") +
+                                        " AND message_id < :before " : StringUtils.EMPTY) +
                                 "ORDER BY message_id DESC LIMIT 20",
                         sqlParameterSource,
                         Integer.class);
@@ -500,7 +500,7 @@ public class MessagesServiceImpl extends BaseJdbcService implements MessagesServ
                 "SELECT f.message_id FROM favorites f WHERE " +
                         "EXISTS (SELECT 1 FROM subscr_users s WHERE s.suser_id = :uid and f.user_id = s.user_id)" +
                         (before > 0 ?
-                                " AND f.message_id < :before " : "") +
+                                " AND f.message_id < :before " : StringUtils.EMPTY) +
                         "ORDER BY f.message_id DESC LIMIT 20",
                 sqlParameterSource,
                 Integer.class);
@@ -516,7 +516,7 @@ public class MessagesServiceImpl extends BaseJdbcService implements MessagesServ
         return getNamedParameterJdbcTemplate().queryForList(
                 "SELECT m.message_id FROM messages m WHERE m.privacy > 0 " +
                         (before > 0 ?
-                                " AND m.message_id < :before " : "") +
+                                " AND m.message_id < :before " : StringUtils.EMPTY) +
                         " AND m.popular > 0 AND NOT EXISTS (SELECT 1 FROM bl_users b WHERE b.user_id = :vid and b.bl_user_id = m.user_id) " +
                         " ORDER BY m.message_id DESC LIMIT 20",
                 sqlParameterSource,
@@ -533,7 +533,7 @@ public class MessagesServiceImpl extends BaseJdbcService implements MessagesServ
         return getNamedParameterJdbcTemplate().queryForList(
                 "SELECT m.message_id FROM messages m WHERE (m.privacy > 0 OR m.user_id = :vid) " +
                         (before > 0 ?
-                                " AND m.message_id < :before " : "") +
+                                " AND m.message_id < :before " : StringUtils.EMPTY) +
                         " AND m.attach IS NOT NULL " +
                         " AND NOT EXISTS (SELECT 1 from users u WHERE u.banned = 1 and u.id = m.user_id) " +
                         " AND NOT EXISTS (SELECT 1 FROM bl_users b WHERE b.user_id = :vid and b.bl_user_id = m.user_id) " +
@@ -566,7 +566,7 @@ public class MessagesServiceImpl extends BaseJdbcService implements MessagesServ
         return getNamedParameterJdbcTemplate().queryForList(
                 "SELECT message_id FROM messages WHERE user_id = :uid" +
                         (before > 0 ?
-                                " AND message_id < :before" : "") +
+                                " AND message_id < :before" : StringUtils.EMPTY) +
                         " AND privacy >= :privacy ORDER BY message_id DESC LIMIT 20",
                 sqlParameterSource,
                 Integer.class);
@@ -585,7 +585,7 @@ public class MessagesServiceImpl extends BaseJdbcService implements MessagesServ
                 "SELECT messages.message_id FROM messages_tags INNER JOIN messages " +
                         " USING (message_id) WHERE messages.user_id = :uid AND messages_tags.tag_id = :tid " +
                         (before > 0 ?
-                                " AND messages.message_id < :before " : "") +
+                                " AND messages.message_id < :before " : StringUtils.EMPTY) +
                         " AND messages.privacy >= :privacy ORDER BY messages.message_id DESC LIMIT 20",
                 sqlParameterSource,
                 Integer.class);
@@ -602,7 +602,7 @@ public class MessagesServiceImpl extends BaseJdbcService implements MessagesServ
                 "SELECT message_id FROM favorites " +
                         " WHERE user_id = :uid " +
                         (before > 0 ?
-                                " AND message_id < :before " : "") +
+                                " AND message_id < :before " : StringUtils.EMPTY) +
                         " ORDER BY message_id DESC LIMIT 20",
                 sqlParameterSource,
                 Integer.class);
@@ -619,7 +619,7 @@ public class MessagesServiceImpl extends BaseJdbcService implements MessagesServ
         return getNamedParameterJdbcTemplate().queryForList(
                 "SELECT message_id FROM messages WHERE user_id = :uid " +
                         (before > 0 ?
-                                " AND message_id < :before " : "") +
+                                " AND message_id < :before " : StringUtils.EMPTY) +
                         " AND privacy >= :privacy AND attach IS NOT NULL ORDER BY message_id DESC LIMIT 20",
                 sqlParameterSource,
                 Integer.class);
diff --git a/juick-server/src/main/java/com/juick/service/SubscriptionServiceImpl.java b/juick-server/src/main/java/com/juick/service/SubscriptionServiceImpl.java
index decfe59d..4082e1ef 100644
--- a/juick-server/src/main/java/com/juick/service/SubscriptionServiceImpl.java
+++ b/juick-server/src/main/java/com/juick/service/SubscriptionServiceImpl.java
@@ -3,6 +3,7 @@ package com.juick.service;
 import com.juick.Tag;
 import com.juick.User;
 import com.juick.server.helpers.NotifyOpts;
+import org.apache.commons.lang3.StringUtils;
 import org.springframework.jdbc.core.JdbcTemplate;
 import org.springframework.jdbc.core.namedparam.MapSqlParameterSource;
 import org.springframework.stereotype.Repository;
@@ -47,7 +48,7 @@ public class SubscriptionServiceImpl extends BaseJdbcService implements Subscrip
                 "SELECT jids.jid FROM subscr_users INNER JOIN jids " +
                         "ON (subscr_users.user_id = :uid AND subscr_users.suser_id = jids.user_id) WHERE jids.active = 1 " +
                         (friendsonly ?
-                                " AND EXISTS (SELECT 1 FROM wl_users w WHERE w.user_id = :uid and jids.user_id = w.wl_user_id)" : ""),
+                                " AND EXISTS (SELECT 1 FROM wl_users w WHERE w.user_id = :uid and jids.user_id = w.wl_user_id)" : StringUtils.EMPTY),
                 new MapSqlParameterSource("uid", uid),
                 String.class);
     }
diff --git a/juick-server/src/main/java/com/juick/service/UserServiceImpl.java b/juick-server/src/main/java/com/juick/service/UserServiceImpl.java
index b3430254..f226b402 100644
--- a/juick-server/src/main/java/com/juick/service/UserServiceImpl.java
+++ b/juick-server/src/main/java/com/juick/service/UserServiceImpl.java
@@ -357,7 +357,7 @@ public class UserServiceImpl extends BaseJdbcService implements UserService {
             if (ret > 0)
                 return newHash;
         }
-        return "";
+        return StringUtils.EMPTY;
     }
 
     @Transactional(readOnly = true)
@@ -649,7 +649,7 @@ public class UserServiceImpl extends BaseJdbcService implements UserService {
                 "SELECT hash FROM mail WHERE user_id = ?",
                 String.class,
                 user.getUid());
-        return list.isEmpty() ? "" : list.get(0) + "@mail.juick.com";
+        return list.isEmpty() ? StringUtils.EMPTY : list.get(0) + "@mail.juick.com";
     }
 
     @Transactional
diff --git a/juick-server/src/main/java/com/juick/service/search/SphinxSearchServiceImpl.java b/juick-server/src/main/java/com/juick/service/search/SphinxSearchServiceImpl.java
index de0a101f..161e0fb2 100644
--- a/juick-server/src/main/java/com/juick/service/search/SphinxSearchServiceImpl.java
+++ b/juick-server/src/main/java/com/juick/service/search/SphinxSearchServiceImpl.java
@@ -49,7 +49,7 @@ public class SphinxSearchServiceImpl implements SearchService {
         return namedParameterSearchJdbcTemplate.queryForList(
                 "SELECT id AS message_id FROM messages WHERE MATCH(:search) " +
                         (messageIdBefore > 0 ?
-                                " AND id < :before " : "") +
+                                " AND id < :before " : StringUtils.EMPTY) +
                         " ORDER BY id DESC LIMIT :limit",
                 sqlParameterSource,
                 Integer.class);
@@ -69,7 +69,7 @@ public class SphinxSearchServiceImpl implements SearchService {
         return namedParameterSearchJdbcTemplate.queryForList(
                 "SELECT id AS message_id FROM messages WHERE user_id = :userId AND MATCH(:search) " +
                         (messageIdBefore > 0 ?
-                                " AND id < :before " : "") +
+                                " AND id < :before " : StringUtils.EMPTY) +
                         " ORDER BY id DESC LIMIT :limit",
                 sqlParameterSource,
                 Integer.class);
diff --git a/juick-server/src/main/java/com/juick/service/security/deprecated/CookieSimpleHashRememberMeServices.java b/juick-server/src/main/java/com/juick/service/security/deprecated/CookieSimpleHashRememberMeServices.java
index ec44baa0..1fb2c6a3 100644
--- a/juick-server/src/main/java/com/juick/service/security/deprecated/CookieSimpleHashRememberMeServices.java
+++ b/juick-server/src/main/java/com/juick/service/security/deprecated/CookieSimpleHashRememberMeServices.java
@@ -104,6 +104,6 @@ public class CookieSimpleHashRememberMeServices extends AbstractRememberMeServic
 
     @Override
     protected String encodeCookie(String[] cookieTokens) {
-        return cookieTokens != null && cookieTokens.length > 0 ? cookieTokens[0] : "";
+        return cookieTokens != null && cookieTokens.length > 0 ? cookieTokens[0] : StringUtils.EMPTY;
     }
 }
diff --git a/juick-server/src/main/java/com/juick/util/TagUtils.java b/juick-server/src/main/java/com/juick/util/TagUtils.java
index 157522ab..fec59f29 100644
--- a/juick-server/src/main/java/com/juick/util/TagUtils.java
+++ b/juick-server/src/main/java/com/juick/util/TagUtils.java
@@ -2,6 +2,7 @@ package com.juick.util;
 
 import com.juick.Tag;
 import org.apache.commons.collections4.CollectionUtils;
+import org.apache.commons.lang3.StringUtils;
 
 import java.util.List;
 import java.util.stream.Collectors;
@@ -16,7 +17,7 @@ public class TagUtils {
 
     public static String toString(final List<Tag> tags) {
         if (CollectionUtils.isEmpty(tags))
-            return "";
+            return StringUtils.EMPTY;
 
         return tags.stream().map(t -> " *" + t.getName())
                 .collect(Collectors.joining());