diff --git a/src/main/scala/app/PullRequestsController.scala b/src/main/scala/app/PullRequestsController.scala
index d4787e1..b4cb72c 100644
--- a/src/main/scala/app/PullRequestsController.scala
+++ b/src/main/scala/app/PullRequestsController.scala
@@ -338,12 +338,12 @@
       using(Git.open(getRepositoryDir(requestUserName, requestRepositoryName))) { git =>
         val remoteRefName = s"refs/heads/${branch}"
         val tmpRefName = s"refs/merge-check/${userName}/${branch}"
-
-        withTmpRefSpec(new RefSpec(s"${remoteRefName}:${tmpRefName}").setForceUpdate(true), git) { ref =>
+        val refSpec = new RefSpec(s"${remoteRefName}:${tmpRefName}").setForceUpdate(true)
+        try {
           // fetch objects from origin repository branch
           git.fetch
              .setRemote(getRepositoryDir(userName, repositoryName).toURI.toString)
-             .setRefSpecs(ref)
+             .setRefSpecs(refSpec)
              .call
 
           // merge conflict check
@@ -355,6 +355,10 @@
           } catch {
             case e: NoMergeBaseException =>  true
           }
+        } finally {
+          val refUpdate = git.getRepository.updateRef(refSpec.getDestination)
+          refUpdate.setForceUpdate(true)
+          refUpdate.delete()
         }
       }
     }
diff --git a/src/main/scala/app/WikiController.scala b/src/main/scala/app/WikiController.scala
index aaa88a8..704ce20 100644
--- a/src/main/scala/app/WikiController.scala
+++ b/src/main/scala/app/WikiController.scala
@@ -188,16 +188,16 @@
 
   private def conflictForNew: Constraint = new Constraint(){
     override def validate(name: String, value: String, messages: Messages): Option[String] = {
-      optionIf(targetWikiPage.nonEmpty){
-        Some("Someone has created the wiki since you started. Please reload this page and re-apply your changes.")
+      targetWikiPage.map { _ =>
+        "Someone has created the wiki since you started. Please reload this page and re-apply your changes."
       }
     }
   }
 
   private def conflictForEdit: Constraint = new Constraint(){
     override def validate(name: String, value: String, messages: Messages): Option[String] = {
-      optionIf(targetWikiPage.map(_.id != params("id")).getOrElse(false)){
-        Some("Someone has edited the wiki since you started. Please reload this page and re-apply your changes.")
+      targetWikiPage.filter(_.id != params("id")).map{ _ =>
+        "Someone has edited the wiki since you started. Please reload this page and re-apply your changes."
       }
     }
   }
diff --git a/src/main/scala/service/WikiService.scala b/src/main/scala/service/WikiService.scala
index 4b8a05c..0988ad2 100644
--- a/src/main/scala/service/WikiService.scala
+++ b/src/main/scala/service/WikiService.scala
@@ -59,11 +59,11 @@
    */
   def getWikiPage(owner: String, repository: String, pageName: String): Option[WikiPageInfo] = {
     using(Git.open(Directory.getWikiRepositoryDir(owner, repository))){ git =>
-      optionIf(!JGitUtil.isEmpty(git)){
+      if(!JGitUtil.isEmpty(git)){
         JGitUtil.getFileList(git, "master", ".").find(_.name == pageName + ".md").map { file =>
           WikiPageInfo(file.name, new String(git.getRepository.open(file.id).getBytes, "UTF-8"), file.committer, file.time, file.commitId)
         }
-      }
+      } else None
     }
   }
 
@@ -72,7 +72,7 @@
    */
   def getFileContent(owner: String, repository: String, path: String): Option[Array[Byte]] =
     using(Git.open(Directory.getWikiRepositoryDir(owner, repository))){ git =>
-      optionIf(!JGitUtil.isEmpty(git)){
+      if(!JGitUtil.isEmpty(git)){
         val index = path.lastIndexOf('/')
         val parentPath = if(index < 0) "."  else path.substring(0, index)
         val fileName   = if(index < 0) path else path.substring(index + 1)
@@ -80,7 +80,7 @@
         JGitUtil.getFileList(git, "master", parentPath).find(_.name == fileName).map { file =>
           git.getRepository.open(file.id).getBytes
         }
-      }
+      } else None
     }
 
   /**
@@ -239,7 +239,7 @@
           }
         }
 
-        optionIf(created || updated || removed){
+        if(created || updated || removed){
           builder.add(JGitUtil.createDirCacheEntry(newPageName + ".md", FileMode.REGULAR_FILE, inserter.insert(Constants.OBJ_BLOB, content.getBytes("UTF-8"))))
           builder.finish()
           val newHeadId = JGitUtil.createNewCommit(git, inserter, headId, builder.getDirCache.writeTree(inserter), committer.fullName, committer.mailAddress,
@@ -256,7 +256,7 @@
             })
 
           Some(newHeadId)
-        }
+        } else None
       }
     }
   }
diff --git a/src/main/scala/servlet/GitRepositoryServlet.scala b/src/main/scala/servlet/GitRepositoryServlet.scala
index a00a928..ed1dfd7 100644
--- a/src/main/scala/servlet/GitRepositoryServlet.scala
+++ b/src/main/scala/servlet/GitRepositoryServlet.scala
@@ -97,17 +97,17 @@
         val newCommits = if(commits.size > 1000){
           val existIds = getAllCommitIds(owner, repository)
           commits.flatMap { commit =>
-            optionIf(!existIds.contains(commit.id)){
+            if(!existIds.contains(commit.id)){
               createIssueComment(commit)
               Some(commit)
-            }
+            } else None
           }
         } else {
           commits.flatMap { commit =>
-            optionIf(!existsCommitId(owner, repository, commit.id)){
+            if(!existsCommitId(owner, repository, commit.id)){
               createIssueComment(commit)
               Some(commit)
-            }
+            } else None
           }
         }
 
diff --git a/src/main/scala/util/ControlUtil.scala b/src/main/scala/util/ControlUtil.scala
index 17958c1..02d7fd1 100644
--- a/src/main/scala/util/ControlUtil.scala
+++ b/src/main/scala/util/ControlUtil.scala
@@ -40,22 +40,14 @@
     try f(treeWalk) finally treeWalk.release()
 
 
-  def withTmpRefSpec[T](ref: RefSpec, git: Git)(f: RefSpec => T): T = {
-    try {
-      f(ref)
-    } finally {
-      val refUpdate = git.getRepository.updateRef(ref.getDestination)
-      refUpdate.setForceUpdate(true)
-      refUpdate.delete()
-    }
-  }
+//  def withTmpRefSpec[T](ref: RefSpec, git: Git)(f: RefSpec => T): T = {
+//    try {
+//      f(ref)
+//    } finally {
+//      val refUpdate = git.getRepository.updateRef(ref.getDestination)
+//      refUpdate.setForceUpdate(true)
+//      refUpdate.delete()
+//    }
+//  }
 
-  def executeIf(condition: => Boolean)(action: => Unit): Boolean =
-    if(condition){
-      action
-      true
-    } else false
-
-  def optionIf[T](condition: => Boolean)(action: => Option[T]): Option[T] =
-    if(condition) action else None
 }
diff --git a/src/main/scala/util/JGitUtil.scala b/src/main/scala/util/JGitUtil.scala
index 9286362..742641e 100644
--- a/src/main/scala/util/JGitUtil.scala
+++ b/src/main/scala/util/JGitUtil.scala
@@ -79,9 +79,9 @@
     }
 
     val description = defining(fullMessage.trim.indexOf("\n")){ i =>
-      optionIf(i >= 0){
+      if(i >= 0){
         Some(fullMessage.trim.substring(i).trim)
-      }
+      } else None
     }
   }
 
diff --git a/src/main/scala/util/LDAPUtil.scala b/src/main/scala/util/LDAPUtil.scala
index 3f19b28..b6859d2 100644
--- a/src/main/scala/util/LDAPUtil.scala
+++ b/src/main/scala/util/LDAPUtil.scala
@@ -130,8 +130,8 @@
 
   private def findMailAddress(conn: LDAPConnection, userDN: String, mailAttribute: String): Option[String] =
     defining(conn.search(userDN, LDAPConnection.SCOPE_BASE, null, Array[String](mailAttribute), false)){ results =>
-      optionIf (results.hasMore) {
+      if(results.hasMore) {
         Option(results.next.getAttribute(mailAttribute)).map(_.getStringValue)
-      }
+      } else None
     }
 }