don't use lateinit in CacheController()

src/main/kotlin/org/mosad/thecitadelofricks/APIController.kt

@@ -60,12 +60,12 @@ class APIController {
     // TODO remove this with API version 2.0.0
     @Deprecated("courses is replaced by courseList", replaceWith = ReplaceWith("courseList()"))
     @RequestMapping("/courses")
-    fun courses(): CourseList {
+    fun courses(): CoursesList {
         return courseList()
     }
 
     @RequestMapping("/courseList")
-    fun courseList(): CourseList {
+    fun courseList(): CoursesList {
         logger.info("courseList request at ${LocalDateTime.now()}!")
         updateTotalRequests()
         return courseList

src/main/kotlin/org/mosad/thecitadelofricks/DataTypes.kt

@@ -28,9 +28,9 @@ import java.util.*
 // data classes for the course part
 data class Course(val courseName: String, val courseLink: String)
 
-data class CourseMeta(val updateTime: Long, val totalCourses: Int)
+data class CoursesMeta(val updateTime: Long, val totalCourses: Int)
 
-data class CourseList(val meta: CourseMeta, val courses: ArrayList<Course>)
+data class CoursesList(val meta: CoursesMeta, val courses: ArrayList<Course>)
 
 // data classes for the Mensa part
 data class Meal(val day: String, val heading: String, val parts: ArrayList<String>, val additives: String)

src/main/kotlin/org/mosad/thecitadelofricks/controller/CacheController.kt

@@ -55,8 +55,8 @@ class CacheController {
     companion object{
         private val logger: Logger = LoggerFactory.getLogger(CacheController::class.java)
 
-        lateinit var courseList: CourseList
-        lateinit var mensaMenu: MensaMenu
+        var courseList = CoursesList(CoursesMeta(0, 0), ArrayList())
+        var mensaMenu = MensaMenu(MensaMeta(0,""), MensaWeek(), MensaWeek())
         var timetableList = ArrayList<TimetableCourseWeek>() // this list contains all timetables
 
         /**
@@ -141,12 +141,12 @@ class CacheController {
      */
     private fun asyncUpdateCourseList() = GlobalScope.launch {
         CourseListParser().getCourseLinks(StartupController.courseListURL)?.let {
-            courseList = CourseList(
-                CourseMeta(System.currentTimeMillis() / 1000, it.size), it
+            courseList = CoursesList(
+                CoursesMeta(System.currentTimeMillis() / 1000, it.size), it
             )
         }
 
-        logger.info("updated courses successful at ${Date(courseList.meta.updateTime * 1000)}")
+        logger.info("Updated courses successful at ${Date(courseList.meta.updateTime * 1000)}")
     }
 
     /**
@@ -164,7 +164,7 @@ class CacheController {
             )
         }
 
-        logger.info("updated mensamenu successful at ${Date(mensaMenu.meta.updateTime * 1000)}")
+        logger.info("Updated mensamenu successful at ${Date(mensaMenu.meta.updateTime * 1000)}")
     }
 
     /**
@@ -173,7 +173,7 @@ class CacheController {
      * a FixedThreadPool is used to make parallel requests for faster updates
      */
     private fun asyncUpdateTimetables() = GlobalScope.launch {
-        logger.info("updating ${timetableList.size} timetables ...")
+        logger.info("Updating ${timetableList.size} timetables ...")
 
         // create a new ThreadPool with 5 threads
         val executor = Executors.newFixedThreadPool(5)
@@ -189,7 +189,7 @@ class CacheController {
 
             }
         } catch (ex: Exception) {
-            logger.error("error while updating the timetables", ex)
+            logger.error("Error while updating the timetables", ex)
         } finally {
             executor.shutdown()
         }
@@ -214,16 +214,16 @@ class CacheController {
      * runBlocking: otherwise the api would return no data to requests for a few seconds after startup
      */
     private fun initUpdates() = runBlocking {
-        // get all courses on startup
+        // get all course links on startup, make sure there are course links
         val jobCourseUpdate = GlobalScope.async {
             CourseListParser().getCourseLinks(StartupController.courseListURL)?.let {
-                courseList = CourseList(
-                    CourseMeta(System.currentTimeMillis() / 1000, it.size), it
+                courseList = CoursesList(
+                    CoursesMeta(System.currentTimeMillis() / 1000, it.size), it
                 )
             }
         }
 
-        // get the current and next weeks mensa menus
+        // get the current and next weeks mensa menu
         val jobMensa = GlobalScope.async{
             val mensaCurrentWeek = MensaParser().getMensaMenu(StartupController.mensaMenuURL)
             val mensaNextWeek = MensaParser().getMensaMenu(MensaParser().getMenuLinkNextWeek(StartupController.mensaMenuURL))
@@ -239,7 +239,7 @@ class CacheController {
         jobCourseUpdate.await()
         jobMensa.await()
 
-        logger.info("init updates successful")
+        logger.info("Initial updates successful")
     }
 
     /**