diff --git a/src/main/scala/service/RequestCache.scala b/src/main/scala/service/RequestCache.scala
index 0f0b0f0..3747e85 100644
--- a/src/main/scala/service/RequestCache.scala
+++ b/src/main/scala/service/RequestCache.scala
@@ -1,7 +1,6 @@
 package service
 
 import model._
-import service.SystemSettingsService.SystemSettings
 
 /**
  * This service is used for a view helper mainly.
@@ -9,28 +8,23 @@
  * It may be called many times in one request, so each method stores
  * its result into the cache which available during a request.
  */
-trait RequestCache {
-
-  def getSystemSettings()(implicit context: app.Context): SystemSettings =
-    context.cache("system_settings"){
-      new SystemSettingsService {}.loadSystemSettings()
-    }
+trait RequestCache extends SystemSettingsService with AccountService with IssuesService {
 
   def getIssue(userName: String, repositoryName: String, issueId: String)(implicit context: app.Context): Option[Issue] = {
     context.cache(s"issue.${userName}/${repositoryName}#${issueId}"){
-      new IssuesService {}.getIssue(userName, repositoryName, issueId)
+      super.getIssue(userName, repositoryName, issueId)
     }
   }
 
   def getAccountByUserName(userName: String)(implicit context: app.Context): Option[Account] = {
     context.cache(s"account.${userName}"){
-      new AccountService {}.getAccountByUserName(userName)
+      super.getAccountByUserName(userName)
     }
   }
 
   def getAccountByMailAddress(mailAddress: String)(implicit context: app.Context): Option[Account] = {
     context.cache(s"account.${mailAddress}"){
-      new AccountService {}.getAccountByMailAddress(mailAddress)
+      super.getAccountByMailAddress(mailAddress)
     }
   }
 }
diff --git a/src/main/scala/view/AvatarImageProvider.scala b/src/main/scala/view/AvatarImageProvider.scala
index bcc2d6b..1dff9ab 100644
--- a/src/main/scala/view/AvatarImageProvider.scala
+++ b/src/main/scala/view/AvatarImageProvider.scala
@@ -16,7 +16,7 @@
     val src = if(mailAddress.isEmpty){
       // by user name
       getAccountByUserName(userName).map { account =>
-        if(account.image.isEmpty && getSystemSettings().gravatar){
+        if(account.image.isEmpty && context.settings.gravatar){
           s"""https://www.gravatar.com/avatar/${StringUtil.md5(account.mailAddress.toLowerCase)}?s=${size}"""
         } else {
           s"""${context.path}/${account.userName}/_avatar"""
@@ -27,13 +27,13 @@
     } else {
       // by mail address
       getAccountByMailAddress(mailAddress).map { account =>
-        if(account.image.isEmpty && getSystemSettings().gravatar){
+        if(account.image.isEmpty && context.settings.gravatar){
           s"""https://www.gravatar.com/avatar/${StringUtil.md5(account.mailAddress.toLowerCase)}?s=${size}"""
         } else {
           s"""${context.path}/${account.userName}/_avatar"""
         }
       } getOrElse {
-        if(getSystemSettings().gravatar){
+        if(context.settings.gravatar){
           s"""https://www.gravatar.com/avatar/${StringUtil.md5(mailAddress.toLowerCase)}?s=${size}"""
         } else {
           s"""${context.path}/_unknown/_avatar"""
diff --git a/src/test/scala/view/AvatarImageProviderSpec.scala b/src/test/scala/view/AvatarImageProviderSpec.scala
index 003c00f..4a00c4f 100644
--- a/src/test/scala/view/AvatarImageProviderSpec.scala
+++ b/src/test/scala/view/AvatarImageProviderSpec.scala
@@ -10,53 +10,58 @@
 
 class AvatarImageProviderSpec extends Specification {
 
-  implicit val context = app.Context("", None, null)
-
   "getAvatarImageHtml" should {
     "show Gravatar image for no image account if gravatar integration is enabled" in {
-      val provider = new AvatarImageProviderImpl(Some(createAccount(None)), createSystemSettings(true))
+      implicit val context = app.Context(createSystemSettings(true), None, null)
+      val provider = new AvatarImageProviderImpl(Some(createAccount(None)))
 
       provider.toHtml("user", 20).toString mustEqual
         "<img src=\"https://www.gravatar.com/avatar/d41d8cd98f00b204e9800998ecf8427e?s=20\" class=\"avatar\" style=\"width: 20px; height: 20px;\" />"
     }
 
     "show uploaded image even if gravatar integration is enabled" in {
-      val provider = new AvatarImageProviderImpl(Some(createAccount(Some("icon.png"))), createSystemSettings(true))
+      implicit val context = app.Context(createSystemSettings(true), None, null)
+      val provider = new AvatarImageProviderImpl(Some(createAccount(Some("icon.png"))))
 
       provider.toHtml("user", 20).toString mustEqual
         "<img src=\"/user/_avatar\" class=\"avatar\" style=\"width: 20px; height: 20px;\" />"
     }
 
     "show local image for no image account if gravatar integration is disabled" in {
-      val provider = new AvatarImageProviderImpl(Some(createAccount(None)), createSystemSettings(false))
+      implicit val context = app.Context(createSystemSettings(false), None, null)
+      val provider = new AvatarImageProviderImpl(Some(createAccount(None)))
 
       provider.toHtml("user", 20).toString mustEqual
         "<img src=\"/user/_avatar\" class=\"avatar\" style=\"width: 20px; height: 20px;\" />"
     }
 
     "show Gravatar image for specified mail address if gravatar integration is enabled" in {
-      val provider = new AvatarImageProviderImpl(None, createSystemSettings(true))
+      implicit val context = app.Context(createSystemSettings(true), None, null)
+      val provider = new AvatarImageProviderImpl(None)
 
       provider.toHtml("user", 20, "hoge@hoge.com").toString mustEqual
         "<img src=\"https://www.gravatar.com/avatar/4712f9b0e63f56ad952ad387eaa23b9c?s=20\" class=\"avatar\" style=\"width: 20px; height: 20px;\" />"
     }
 
     "show unknown image for unknown user if gravatar integration is enabled" in {
-      val provider = new AvatarImageProviderImpl(None, createSystemSettings(true))
+      implicit val context = app.Context(createSystemSettings(true), None, null)
+      val provider = new AvatarImageProviderImpl(None)
 
       provider.toHtml("user", 20).toString mustEqual
         "<img src=\"/_unknown/_avatar\" class=\"avatar\" style=\"width: 20px; height: 20px;\" />"
     }
 
     "show unknown image for specified mail address if gravatar integration is disabled" in {
-      val provider = new AvatarImageProviderImpl(None, createSystemSettings(false))
+      implicit val context = app.Context(createSystemSettings(false), None, null)
+      val provider = new AvatarImageProviderImpl(None)
 
       provider.toHtml("user", 20, "hoge@hoge.com").toString mustEqual
         "<img src=\"/_unknown/_avatar\" class=\"avatar\" style=\"width: 20px; height: 20px;\" />"
     }
 
     "add tooltip if it's enabled" in {
-      val provider = new AvatarImageProviderImpl(None, createSystemSettings(false))
+      implicit val context = app.Context(createSystemSettings(false), None, null)
+      val provider = new AvatarImageProviderImpl(None)
 
       provider.toHtml("user", 20, "hoge@hoge.com", true).toString mustEqual
         "<img src=\"/_unknown/_avatar\" class=\"avatar\" style=\"width: 20px; height: 20px;\" data-toggle=\"tooltip\" title=\"user\"/>"
@@ -80,7 +85,7 @@
 
   private def createSystemSettings(useGravatar: Boolean) =
     SystemSettings(
-      baseUrl                  = None,
+      baseUrl                  = Some(""),
       allowAccountRegistration = false,
       gravatar                 = useGravatar,
       notification             = false,
@@ -93,15 +98,13 @@
   /**
    * Adapter to test AvatarImageProviderImpl.
    */
-  class AvatarImageProviderImpl(account: Option[Account], settings: SystemSettings)
-      extends AvatarImageProvider with RequestCache {
+  class AvatarImageProviderImpl(account: Option[Account]) extends AvatarImageProvider with RequestCache {
 
     def toHtml(userName: String, size: Int,  mailAddress: String = "", tooltip: Boolean = false)
               (implicit context: app.Context): Html = getAvatarImageHtml(userName, size, mailAddress, tooltip)
 
     override def getAccountByMailAddress(mailAddress: String)(implicit context: app.Context): Option[Account] = account
     override def getAccountByUserName(userName: String)(implicit context: app.Context): Option[Account] = account
-    override def getSystemSettings()(implicit context: app.Context): SystemSettings = settings
   }
 
 }