diff --git a/src/main/scala/de/tobias/playpad/server/PlayPadServer.scala b/src/main/scala/de/tobias/playpad/server/PlayPadServer.scala
index d38f16983184b4b380a9b455e43b16b8cb6c932e..d7a1a4e0a7c89455993e1c0f0f36703cd2f89a8e 100644
--- a/src/main/scala/de/tobias/playpad/server/PlayPadServer.scala
+++ b/src/main/scala/de/tobias/playpad/server/PlayPadServer.scala
@@ -2,14 +2,12 @@ package de.tobias.playpad.server
 
 import java.nio.file.{Files, Paths}
 import java.sql.DriverManager
-import java.util.UUID
 
 import com.j256.ormlite.dao.{Dao, DaoManager}
 import com.j256.ormlite.jdbc.JdbcConnectionSource
 import com.j256.ormlite.table.TableUtils
 import de.tobias.playpad.server.account.{Account, Session}
 import de.tobias.playpad.server.plugin.Plugin
-import de.tobias.playpad.server.project.{Design, Pad, Page, Project}
 import de.tobias.playpad.server.server.account._
 import de.tobias.playpad.server.server.plugin.{PluginGet, PluginList}
 import de.tobias.playpad.server.server.project._
@@ -33,7 +31,7 @@ object PlayPadServer extends App {
 
 	private val settings = settingsLoader.load(settingsPath)
 
-	private val databaseUrl = "jdbc:mysql://" + settings.db_host + ":" + settings.db_port + "/" + settings.db_database + "?autoReconnect=true&wait_timeout=24"
+	private val databaseUrl = s"jdbc:mysql://${settings.db_host}:${settings.db_port}/${settings.db_database}?autoReconnect=true&wait_timeout=24"
 	var connectionSource = new JdbcConnectionSource(databaseUrl)
 	connectionSource.setUsername(settings.db_username)
 	connectionSource.setPassword(settings.db_password)
@@ -80,7 +78,7 @@ object PlayPadServer extends App {
 	// DEBUG
 	exception(classOf[Exception], (exception, _, _) => {
 		exception.printStackTrace()
-		halt(500, "internal error: " + exception.getLocalizedMessage)
+		halt(500, s"internal error: ${exception.getLocalizedMessage}")
 	})
 
 	RouteOverview.enableRouteOverview()
diff --git a/src/main/scala/de/tobias/playpad/server/project/loader/sql/PadLoader.scala b/src/main/scala/de/tobias/playpad/server/project/loader/sql/PadLoader.scala
index aa232255de5c571de6a4d7854c294a1be0417db2..d97d5472c64e1399696dac3e5fd41f9722fc2a73 100644
--- a/src/main/scala/de/tobias/playpad/server/project/loader/sql/PadLoader.scala
+++ b/src/main/scala/de/tobias/playpad/server/project/loader/sql/PadLoader.scala
@@ -9,8 +9,8 @@ import de.tobias.playpad.server.project.{Pad, Page}
 /**
   * Created by tobias on 17.02.17.
   */
-class PadLoader {
-	def load(connection: Connection, page: Page): List[Pad] = {
+class PadLoader(val connection: Connection) {
+	def load(page: Page): List[Pad] = {
 		val sql = s"SELECT * FROM $PAD WHERE $PAD_PAGE_REF = ?"
 		val preparedStatement = connection.prepareStatement(sql)
 		preparedStatement.setString(1, page.toString)
diff --git a/src/main/scala/de/tobias/playpad/server/project/loader/sql/PageLoader.scala b/src/main/scala/de/tobias/playpad/server/project/loader/sql/PageLoader.scala
index 526be459d6c8a8e21f4a8eac0cb16ab87aebe956..7ce80fa0e5aee425ae4fff4e4d85da8504940c73 100644
--- a/src/main/scala/de/tobias/playpad/server/project/loader/sql/PageLoader.scala
+++ b/src/main/scala/de/tobias/playpad/server/project/loader/sql/PageLoader.scala
@@ -9,8 +9,8 @@ import de.tobias.playpad.server.project.{Page, Project}
 /**
   * Created by tobias on 17.02.17.
   */
-class PageLoader {
-	def load(connection: Connection, project: Project): List[Page] = {
+class PageLoader(val connection: Connection) {
+	def load(project: Project): List[Page] = {
 		val sql = s"SELECT * FROM $PAGE WHERE $PAGE_PROJECT_REF = ?"
 		val preparedStatement = connection.prepareStatement(sql)
 		preparedStatement.setString(1, project.id.toString)
@@ -23,8 +23,8 @@ class PageLoader {
 			page.id = UUID.fromString(result.getString(PAGE_ID))
 			page.name = result.getString(PAGE_NAME)
 
-			val padLoader = new PadLoader()
-			page.pads = padLoader.load(connection, page)
+			val padLoader = new PadLoader(connection)
+			page.pads = padLoader.load(page)
 
 			page.project = project
 			pages = page :: pages
diff --git a/src/main/scala/de/tobias/playpad/server/project/loader/sql/ProjectLoader.scala b/src/main/scala/de/tobias/playpad/server/project/loader/sql/ProjectLoader.scala
index f2bce4a7ee9db15ac820b18a4b604ae31e97f43a..7504c623b47d9b6b4f6db0ca592b37ee97f2a5c8 100644
--- a/src/main/scala/de/tobias/playpad/server/project/loader/sql/ProjectLoader.scala
+++ b/src/main/scala/de/tobias/playpad/server/project/loader/sql/ProjectLoader.scala
@@ -9,8 +9,8 @@ import de.tobias.playpad.server.project.utils.SqlDef._
 /**
   * Created by tobias on 17.02.17.
   */
-class ProjectLoader {
-	def load(connection: Connection, id: UUID): List[Project] = {
+class ProjectLoader(val connection: Connection) {
+	def load(id: UUID): List[Project] = {
 		val sql = s"SELECT * FROM $PROJECT WHERE $PROJECT_ID = ?"
 		val preparedStatement = connection.prepareStatement(sql)
 		preparedStatement.setString(1, id.toString)
@@ -24,8 +24,8 @@ class ProjectLoader {
 			project.name = result.getString(PROJECT_NAME)
 			project.accountId = result.getInt(PROJECT_ACCOUNT_ID)
 
-			val pageLoader = new PageLoader()
-			project.pages = pageLoader.load(connection, project)
+			val pageLoader = new PageLoader(connection)
+			project.pages = pageLoader.load(project)
 
 			projects = project :: projects
 		}
@@ -36,7 +36,7 @@ class ProjectLoader {
 		projects
 	}
 
-	def getAccountId(connection: Connection, id: UUID): Int = {
+	def getAccountId(id: UUID): Int = {
 		val sql = s"SELECT account_id FROM $PROJECT WHERE $PROJECT_ID = ?"
 
 		val preparedStatement = connection.prepareStatement(sql)
diff --git a/src/main/scala/de/tobias/playpad/server/project/saver/sql/PadSaver.scala b/src/main/scala/de/tobias/playpad/server/project/saver/sql/PadSaver.scala
index 52204c255b6103047abf8c6be74948a0d8685cbc..1e35fb0026e4871a45be8781daf4ca1a25a9e8f3 100644
--- a/src/main/scala/de/tobias/playpad/server/project/saver/sql/PadSaver.scala
+++ b/src/main/scala/de/tobias/playpad/server/project/saver/sql/PadSaver.scala
@@ -9,8 +9,8 @@ import de.tobias.playpad.server.server.SqlHelper
 /**
   * Created by tobias on 17.02.17.
   */
-class PadSaver {
-	def save(connection: Connection, pad: Pad): Unit = {
+class PadSaver(val connection: Connection) {
+	def save(pad: Pad): Unit = {
 		SqlHelper.insertOrUpdate(connection, PAD, pad.id, PAD_NAME, pad.name)
 		SqlHelper.insertOrUpdate(connection, PAD, pad.id, PAD_POSITION, pad.position)
 		SqlHelper.insertOrUpdate(connection, PAD, pad.id, PAD_PAGE, pad.pageIndex)
diff --git a/src/main/scala/de/tobias/playpad/server/project/saver/sql/PageSaver.scala b/src/main/scala/de/tobias/playpad/server/project/saver/sql/PageSaver.scala
index 6abdd60e4a6d6b49af4a52474971f2665e91d391..ec28b8501dd38410456332e94a55092b45a4630a 100644
--- a/src/main/scala/de/tobias/playpad/server/project/saver/sql/PageSaver.scala
+++ b/src/main/scala/de/tobias/playpad/server/project/saver/sql/PageSaver.scala
@@ -9,13 +9,13 @@ import de.tobias.playpad.server.server.SqlHelper
 /**
   * Created by tobias on 17.02.17.
   */
-class PageSaver {
-	def save(connection: Connection, page: Page): Unit = {
+class PageSaver(connection: Connection) {
+	def save(page: Page): Unit = {
 		SqlHelper.insertOrUpdate(connection, PAGE, page.id, PAGE_NAME, page.name)
 		SqlHelper.insertOrUpdate(connection, PAGE, page.id, PAGE_POSITION, page.position)
 		SqlHelper.insertOrUpdate(connection, PAGE, page.id, PAGE_PROJECT_REF, page.project.id)
 
-		val padSaver = new PadSaver
-		page.pads.foreach(padSaver.save(connection, _))
+		val padSaver = new PadSaver(connection)
+		page.pads.foreach(padSaver.save)
 	}
 }
diff --git a/src/main/scala/de/tobias/playpad/server/project/saver/sql/ProjectSaver.scala b/src/main/scala/de/tobias/playpad/server/project/saver/sql/ProjectSaver.scala
index be385e41e82cab37cd7eb7e305fde150f5270372..8fcd2027e2769b4224bcd43b9aabcec3b552c17e 100644
--- a/src/main/scala/de/tobias/playpad/server/project/saver/sql/ProjectSaver.scala
+++ b/src/main/scala/de/tobias/playpad/server/project/saver/sql/ProjectSaver.scala
@@ -10,15 +10,15 @@ import de.tobias.playpad.server.server.SqlHelper
 /**
   * Created by tobias on 17.02.17.
   */
-class ProjectSaver {
-	def save(connection: Connection, project: Project): Unit = {
+class ProjectSaver(val connection: Connection) {
+	def save(project: Project): Unit = {
 		SqlHelper.insertOrUpdate(connection, PROJECT, project.id, PROJECT_NAME, project.name)
 		SqlHelper.insertOrUpdate(connection, PROJECT, project.id, PROJECT_ACCOUNT_ID, project.accountId)
 
-		val pageSaver = new PageSaver
-		project.pages.foreach(pageSaver.save(connection, _))
+		val pageSaver = new PageSaver(connection)
+		project.pages.foreach(pageSaver.save)
 	}
-	def delete(connection: Connection, project: UUID): Unit = {
+	def delete(project: UUID): Unit = {
 		SqlHelper.delete(connection, PROJECT, project)
 	}
 }
diff --git a/src/main/scala/de/tobias/playpad/server/server/project/ProjectDelete.scala b/src/main/scala/de/tobias/playpad/server/server/project/ProjectDelete.scala
index b5a48aa89a6fb84cb1ebf11c199da209e78e7481..689c90d26dd8ef7b9a02b50caca19b21fb1c233a 100644
--- a/src/main/scala/de/tobias/playpad/server/server/project/ProjectDelete.scala
+++ b/src/main/scala/de/tobias/playpad/server/server/project/ProjectDelete.scala
@@ -21,11 +21,12 @@ class ProjectDelete(connection: Connection, sessionDao: Dao[Session, Int]) exten
 			case Some(s) =>
 				val projectId = UUID.fromString(request.queryParams("project"))
 
-				val projectLoader = new ProjectLoader
-				val account_id = projectLoader.getAccountId(connection, projectId)
+				val projectLoader = new ProjectLoader(connection)
+				val account_id = projectLoader.getAccountId(projectId)
+
 				if (account_id == s.getAccount.id) {
-					val projectSaver = new ProjectSaver
-					projectSaver.delete(connection, projectId)
+					val projectSaver = new ProjectSaver(connection)
+					projectSaver.delete(projectId)
 
 					return new Result(Status.OK, "added project")
 				}
diff --git a/src/main/scala/de/tobias/playpad/server/server/project/ProjectGet.scala b/src/main/scala/de/tobias/playpad/server/server/project/ProjectGet.scala
index 8cf5aef679674559fa146d7efe1a1659076e3bbc..71f86b84352df7789f32a42e39a211bb957170b6 100644
--- a/src/main/scala/de/tobias/playpad/server/server/project/ProjectGet.scala
+++ b/src/main/scala/de/tobias/playpad/server/server/project/ProjectGet.scala
@@ -23,8 +23,8 @@ class ProjectGet(connection: Connection, sessionDao: Dao[Session, Int]) extends
 
 		session match {
 			case Some(s) =>
-				val projectLoader = new ProjectLoader()
-				val projects = projectLoader.load(connection, UUID.fromString(projectId))
+				val projectLoader = new ProjectLoader(connection)
+				val projects = projectLoader.load(UUID.fromString(projectId))
 
 				if (projects.size == 1) {
 					val project = projects.head
diff --git a/src/main/scala/de/tobias/playpad/server/server/project/ProjectPost.scala b/src/main/scala/de/tobias/playpad/server/server/project/ProjectPost.scala
index bf2365eeb8d21041cf7576edbd6fc1a11602afb1..93fa8a7d65936affa8147f16fc681c5a1a5bf2d0 100644
--- a/src/main/scala/de/tobias/playpad/server/server/project/ProjectPost.scala
+++ b/src/main/scala/de/tobias/playpad/server/server/project/ProjectPost.scala
@@ -27,8 +27,8 @@ class ProjectPost(connection: Connection, sessionDao: Dao[Session, Int]) extends
 				val project = projectLoader.load(json)
 				project.accountId = s.getAccount.id
 
-				val projectSaver = new ProjectSaver
-				projectSaver.save(connection, project)
+				val projectSaver = new ProjectSaver(connection)
+				projectSaver.save(project)
 
 				new Result(Status.OK, "added project")
 			case None =>