diff --git a/src/main/scala/gitbucket/core/controller/FileUploadController.scala b/src/main/scala/gitbucket/core/controller/FileUploadController.scala
index d26434113..329690393 100644
--- a/src/main/scala/gitbucket/core/controller/FileUploadController.scala
+++ b/src/main/scala/gitbucket/core/controller/FileUploadController.scala
@@ -10,7 +10,6 @@ import gitbucket.core.util.Implicits._
 import org.eclipse.jgit.api.Git
 import org.eclipse.jgit.dircache.DirCache
 import org.eclipse.jgit.lib.{FileMode, Constants}
-import org.scalatra
 import org.scalatra._
 import org.scalatra.servlet.{MultipartConfig, FileUploadSupport, FileItem}
 import org.apache.commons.io.{IOUtils, FileUtils}
diff --git a/src/main/scala/gitbucket/core/controller/IndexController.scala b/src/main/scala/gitbucket/core/controller/IndexController.scala
index 6b4db67f2..bbe4da62b 100644
--- a/src/main/scala/gitbucket/core/controller/IndexController.scala
+++ b/src/main/scala/gitbucket/core/controller/IndexController.scala
@@ -5,7 +5,7 @@ import gitbucket.core.model.Account
 import gitbucket.core.service._
 import gitbucket.core.util.Implicits._
 import gitbucket.core.util.ControlUtil._
-import gitbucket.core.util.{Keys, LDAPUtil, ReferrerAuthenticator, StringUtil, UsersAuthenticator}
+import gitbucket.core.util.{Keys, LDAPUtil, ReferrerAuthenticator, UsersAuthenticator}
 import io.github.gitbucket.scalatra.forms._
 import org.scalatra.Ok
 
diff --git a/src/main/scala/gitbucket/core/controller/IssuesController.scala b/src/main/scala/gitbucket/core/controller/IssuesController.scala
index 6e982b521..5969cb443 100644
--- a/src/main/scala/gitbucket/core/controller/IssuesController.scala
+++ b/src/main/scala/gitbucket/core/controller/IssuesController.scala
@@ -2,7 +2,6 @@ package gitbucket.core.controller
 
 import gitbucket.core.issues.html
 import gitbucket.core.service.IssuesService._
-import gitbucket.core.service.RepositoryService.RepositoryInfo
 import gitbucket.core.service._
 import gitbucket.core.util.ControlUtil._
 import gitbucket.core.util.Implicits._
diff --git a/src/main/scala/gitbucket/core/controller/RepositoryViewerController.scala b/src/main/scala/gitbucket/core/controller/RepositoryViewerController.scala
index 3d59d71aa..b21b03f0d 100644
--- a/src/main/scala/gitbucket/core/controller/RepositoryViewerController.scala
+++ b/src/main/scala/gitbucket/core/controller/RepositoryViewerController.scala
@@ -18,7 +18,7 @@ import gitbucket.core.service.WebHookService._
 import gitbucket.core.view
 import gitbucket.core.view.helpers
 import io.github.gitbucket.scalatra.forms._
-import org.apache.commons.io.{FileUtils, IOUtils}
+import org.apache.commons.io.IOUtils
 import org.eclipse.jgit.api.{ArchiveCommand, Git}
 import org.eclipse.jgit.archive.{TgzFormat, ZipFormat}
 import org.eclipse.jgit.dircache.DirCache
diff --git a/src/main/scala/gitbucket/core/model/CommitStatus.scala b/src/main/scala/gitbucket/core/model/CommitStatus.scala
index 75ed26132..f10840366 100644
--- a/src/main/scala/gitbucket/core/model/CommitStatus.scala
+++ b/src/main/scala/gitbucket/core/model/CommitStatus.scala
@@ -1,6 +1,5 @@
 package gitbucket.core.model
 
-import scala.slick.lifted.MappedTo
 import scala.slick.jdbc._
 
 trait CommitStatusComponent extends TemplateComponent { self: Profile =>
diff --git a/src/main/scala/gitbucket/core/model/ProtectedBranch.scala b/src/main/scala/gitbucket/core/model/ProtectedBranch.scala
index 4700a0430..9679faf99 100644
--- a/src/main/scala/gitbucket/core/model/ProtectedBranch.scala
+++ b/src/main/scala/gitbucket/core/model/ProtectedBranch.scala
@@ -1,8 +1,5 @@
 package gitbucket.core.model
 
-import scala.slick.lifted.MappedTo
-import scala.slick.jdbc._
-
 trait ProtectedBranchComponent extends TemplateComponent { self: Profile =>
   import profile.simple._
   import self._
diff --git a/src/main/scala/gitbucket/core/service/CommitStatusService.scala b/src/main/scala/gitbucket/core/service/CommitStatusService.scala
index ae613ffbb..1c491c95b 100644
--- a/src/main/scala/gitbucket/core/service/CommitStatusService.scala
+++ b/src/main/scala/gitbucket/core/service/CommitStatusService.scala
@@ -5,9 +5,6 @@ import profile.simple._
 
 import gitbucket.core.model.{CommitState, CommitStatus, Account}
 import gitbucket.core.util.Implicits._
-import gitbucket.core.util.StringUtil._
-import gitbucket.core.service.RepositoryService.RepositoryInfo
-import org.joda.time.LocalDateTime
 import gitbucket.core.model.Profile.dateColumnType
 
 trait CommitStatusService {
@@ -54,4 +51,4 @@ trait CommitStatusService {
   protected def byCommitStatues(userName: String, repositoryName: String, sha: String)(implicit s: Session) = 
     CommitStatuses.filter(t => t.byCommit(userName, repositoryName, sha)).sortBy(_.updatedDate desc)
 
-}
\ No newline at end of file
+}
diff --git a/src/main/scala/gitbucket/core/service/CommitsService.scala b/src/main/scala/gitbucket/core/service/CommitsService.scala
index 229519da9..36b30cd99 100644
--- a/src/main/scala/gitbucket/core/service/CommitsService.scala
+++ b/src/main/scala/gitbucket/core/service/CommitsService.scala
@@ -1,14 +1,11 @@
 package gitbucket.core.service
 
 import gitbucket.core.model.CommitComment
-import gitbucket.core.util.{StringUtil, Implicits}
+import gitbucket.core.util.Implicits
 
-import scala.slick.jdbc.{StaticQuery => Q}
-import Q.interpolation
 import gitbucket.core.model.Profile._
 import profile.simple._
 import Implicits._
-import StringUtil._
 
 
 trait CommitsService {
diff --git a/src/main/scala/gitbucket/core/service/IssuesService.scala b/src/main/scala/gitbucket/core/service/IssuesService.scala
index 6a9769da3..c75a120c9 100644
--- a/src/main/scala/gitbucket/core/service/IssuesService.scala
+++ b/src/main/scala/gitbucket/core/service/IssuesService.scala
@@ -111,7 +111,6 @@ trait IssuesService {
             pp.setInt(a._3)
           }
       }
-      import gitbucket.core.model.Profile.commitStateColumnType
       val query = Q.query[Seq[(String, String, Int)], (String, String, Int, Int, Int, Option[String], Option[CommitState], Option[String], Option[String])](s"""
         SELECT
           SUMM.USER_NAME,
diff --git a/src/main/scala/gitbucket/core/service/MergeService.scala b/src/main/scala/gitbucket/core/service/MergeService.scala
index d427d1714..d58a4ecbf 100644
--- a/src/main/scala/gitbucket/core/service/MergeService.scala
+++ b/src/main/scala/gitbucket/core/service/MergeService.scala
@@ -1,9 +1,7 @@
 package gitbucket.core.service
 
 import gitbucket.core.model.Account
-import gitbucket.core.util.LockUtil
 import gitbucket.core.util.Directory._
-import gitbucket.core.util.Implicits._
 import gitbucket.core.util.ControlUtil._
 
 import org.eclipse.jgit.merge.MergeStrategy
@@ -197,4 +195,4 @@ object MergeService{
 
     private def parseCommit(id:ObjectId) = using(new RevWalk( repository ))(_.parseCommit(id))
   }
-}
\ No newline at end of file
+}
diff --git a/src/main/scala/gitbucket/core/service/WebHookService.scala b/src/main/scala/gitbucket/core/service/WebHookService.scala
index 1fb181c20..ad3a30498 100644
--- a/src/main/scala/gitbucket/core/service/WebHookService.scala
+++ b/src/main/scala/gitbucket/core/service/WebHookService.scala
@@ -1,7 +1,5 @@
 package gitbucket.core.service
 
-import java.util.Date
-
 import fr.brouillard.oss.security.xhub.XHub
 import fr.brouillard.oss.security.xhub.XHub.{XHubConverter, XHubDigest}
 import gitbucket.core.api._
diff --git a/src/main/scala/gitbucket/core/servlet/ApiAuthenticationFilter.scala b/src/main/scala/gitbucket/core/servlet/ApiAuthenticationFilter.scala
index 871c29220..c3bd85c2a 100644
--- a/src/main/scala/gitbucket/core/servlet/ApiAuthenticationFilter.scala
+++ b/src/main/scala/gitbucket/core/servlet/ApiAuthenticationFilter.scala
@@ -7,8 +7,6 @@ import gitbucket.core.model.Account
 import gitbucket.core.service.SystemSettingsService.SystemSettings
 import gitbucket.core.service.{AccessTokenService, AccountService, SystemSettingsService}
 import gitbucket.core.util.{AuthUtil, Keys}
-import org.scalatra.servlet.ServletApiImplicits._
-import org.scalatra._
 
 
 class ApiAuthenticationFilter extends Filter with AccessTokenService with AccountService with SystemSettingsService {
diff --git a/src/main/scala/gitbucket/core/servlet/GitLfsTransferServlet.scala b/src/main/scala/gitbucket/core/servlet/GitLfsTransferServlet.scala
index acdb2f60b..4c3188444 100644
--- a/src/main/scala/gitbucket/core/servlet/GitLfsTransferServlet.scala
+++ b/src/main/scala/gitbucket/core/servlet/GitLfsTransferServlet.scala
@@ -4,7 +4,7 @@ import java.io.{File, FileInputStream, FileOutputStream}
 import java.text.MessageFormat
 import javax.servlet.http.{HttpServlet, HttpServletRequest, HttpServletResponse}
 
-import gitbucket.core.util.{Directory, FileUtil, StringUtil}
+import gitbucket.core.util.{FileUtil, StringUtil}
 import org.apache.commons.io.{FileUtils, IOUtils}
 import org.json4s.jackson.Serialization._
 import org.apache.http.HttpStatus
diff --git a/src/main/scala/gitbucket/core/servlet/GitRepositoryServlet.scala b/src/main/scala/gitbucket/core/servlet/GitRepositoryServlet.scala
index e52622591..5ca72be13 100644
--- a/src/main/scala/gitbucket/core/servlet/GitRepositoryServlet.scala
+++ b/src/main/scala/gitbucket/core/servlet/GitRepositoryServlet.scala
@@ -4,7 +4,7 @@ import java.io.File
 import java.util.Date
 
 import gitbucket.core.api
-import gitbucket.core.model.{Session, WebHook}
+import gitbucket.core.model.WebHook
 import gitbucket.core.plugin.{GitRepositoryRouting, PluginRegistry}
 import gitbucket.core.service.IssuesService.IssueSearchCondition
 import gitbucket.core.service.WebHookService._
@@ -337,4 +337,4 @@ object GitLfs {
     message: String
   )
 
-}
\ No newline at end of file
+}
diff --git a/src/main/scala/gitbucket/core/ssh/NoShell.scala b/src/main/scala/gitbucket/core/ssh/NoShell.scala
index 47347fc52..065bee0f5 100644
--- a/src/main/scala/gitbucket/core/ssh/NoShell.scala
+++ b/src/main/scala/gitbucket/core/ssh/NoShell.scala
@@ -1,6 +1,5 @@
 package gitbucket.core.ssh
 
-import gitbucket.core.service.SystemSettingsService
 import gitbucket.core.service.SystemSettingsService.SshAddress
 import org.apache.sshd.common.Factory
 import org.apache.sshd.server.{Environment, ExitCallback, Command}
diff --git a/src/main/scala/gitbucket/core/ssh/PublicKeyAuthenticator.scala b/src/main/scala/gitbucket/core/ssh/PublicKeyAuthenticator.scala
index 8ed2cfb99..cc7a90520 100644
--- a/src/main/scala/gitbucket/core/ssh/PublicKeyAuthenticator.scala
+++ b/src/main/scala/gitbucket/core/ssh/PublicKeyAuthenticator.scala
@@ -2,7 +2,6 @@ package gitbucket.core.ssh
 
 import java.security.PublicKey
 
-import gitbucket.core.model.SshKey
 import gitbucket.core.service.SshKeyService
 import gitbucket.core.servlet.Database
 import org.apache.sshd.server.auth.pubkey.PublickeyAuthenticator
diff --git a/src/main/scala/gitbucket/core/util/StringUtil.scala b/src/main/scala/gitbucket/core/util/StringUtil.scala
index f255b1dbc..0db3efe92 100644
--- a/src/main/scala/gitbucket/core/util/StringUtil.scala
+++ b/src/main/scala/gitbucket/core/util/StringUtil.scala
@@ -6,7 +6,7 @@ import org.mozilla.universalchardet.UniversalDetector
 import ControlUtil._
 import org.apache.commons.io.input.BOMInputStream
 import org.apache.commons.io.IOUtils
-import org.apache.commons.codec.binary.{Base64, StringUtils}
+import org.apache.commons.codec.binary.Base64
 
 import scala.util.control.Exception._
 
diff --git a/src/test/scala/gitbucket/core/service/ServiceSpecBase.scala b/src/test/scala/gitbucket/core/service/ServiceSpecBase.scala
index 673eae006..cfb3a3e7d 100644
--- a/src/test/scala/gitbucket/core/service/ServiceSpecBase.scala
+++ b/src/test/scala/gitbucket/core/service/ServiceSpecBase.scala
@@ -1,7 +1,7 @@
 package gitbucket.core.service
 
 import gitbucket.core.GitBucketCoreModule
-import gitbucket.core.util.{ControlUtil, DatabaseConfig, FileUtil}
+import gitbucket.core.util.{DatabaseConfig, FileUtil}
 import gitbucket.core.util.ControlUtil._
 import gitbucket.core.model._
 import gitbucket.core.model.Profile._
diff --git a/src/test/scala/gitbucket/core/view/AvatarImageProviderSpec.scala b/src/test/scala/gitbucket/core/view/AvatarImageProviderSpec.scala
index 99feeee99..d30eb7fc5 100644
--- a/src/test/scala/gitbucket/core/view/AvatarImageProviderSpec.scala
+++ b/src/test/scala/gitbucket/core/view/AvatarImageProviderSpec.scala
@@ -5,7 +5,7 @@ import java.util.Date
 import gitbucket.core.model.Account
 import gitbucket.core.service.{RequestCache, SystemSettingsService}
 import gitbucket.core.controller.Context
-import SystemSettingsService.{Lfs, SystemSettings}
+import SystemSettingsService.SystemSettings
 import javax.servlet.http.{HttpServletRequest, HttpSession}
 
 import play.twirl.api.Html