diff --git a/src/main/kotlin/dev/dnpm/etl/processor/config/AppSecurityConfiguration.kt b/src/main/kotlin/dev/dnpm/etl/processor/config/AppSecurityConfiguration.kt
index 6b063bd..ddcf202 100644
--- a/src/main/kotlin/dev/dnpm/etl/processor/config/AppSecurityConfiguration.kt
+++ b/src/main/kotlin/dev/dnpm/etl/processor/config/AppSecurityConfiguration.kt
@@ -44,6 +44,8 @@ import org.springframework.security.web.SecurityFilterChain
 import java.util.*
 
 
+private const val LOGIN_PATH = "/login"
+
 @Configuration
 @EnableConfigurationProperties(
     value = [
@@ -104,15 +106,15 @@ class AppSecurityConfiguration(
                 realmName = "ETL-Processor"
             }
             formLogin {
-                loginPage = "/login"
+                loginPage = LOGIN_PATH
             }
             oauth2Login {
-                loginPage = "/login"
+                loginPage = LOGIN_PATH
             }
             sessionManagement {
                 sessionConcurrency {
                     maximumSessions = 1
-                    expiredUrl = "/login?expired"
+                    expiredUrl = "$LOGIN_PATH?expired"
                 }
                 sessionFixation {
                     newSession()
@@ -155,7 +157,7 @@ class AppSecurityConfiguration(
                 realmName = "ETL-Processor"
             }
             formLogin {
-                loginPage = "/login"
+                loginPage = LOGIN_PATH
             }
             csrf { disable() }
         }
diff --git a/src/main/kotlin/dev/dnpm/etl/processor/input/MtbFileRestController.kt b/src/main/kotlin/dev/dnpm/etl/processor/input/MtbFileRestController.kt
index 9e282c2..ded485c 100644
--- a/src/main/kotlin/dev/dnpm/etl/processor/input/MtbFileRestController.kt
+++ b/src/main/kotlin/dev/dnpm/etl/processor/input/MtbFileRestController.kt
@@ -41,7 +41,7 @@ class MtbFileRestController(
     }
 
     @PostMapping
-    fun mtbFile(@RequestBody mtbFile: MtbFile): ResponseEntity<Void> {
+    fun mtbFile(@RequestBody mtbFile: MtbFile): ResponseEntity<Unit> {
         if (mtbFile.consent.status == Consent.Status.ACTIVE) {
             logger.debug("Accepted MTB File for processing")
             requestProcessor.processMtbFile(mtbFile)
@@ -54,7 +54,7 @@ class MtbFileRestController(
     }
 
     @DeleteMapping(path = ["{patientId}"])
-    fun deleteData(@PathVariable patientId: String): ResponseEntity<Void> {
+    fun deleteData(@PathVariable patientId: String): ResponseEntity<Unit> {
         logger.debug("Accepted patient ID to process deletion")
         requestProcessor.processDeletion(PatientId(patientId))
         return ResponseEntity.accepted().build()
diff --git a/src/main/kotlin/dev/dnpm/etl/processor/monitoring/ConnectionCheckService.kt b/src/main/kotlin/dev/dnpm/etl/processor/monitoring/ConnectionCheckService.kt
index 9d96654..b845e21 100644
--- a/src/main/kotlin/dev/dnpm/etl/processor/monitoring/ConnectionCheckService.kt
+++ b/src/main/kotlin/dev/dnpm/etl/processor/monitoring/ConnectionCheckService.kt
@@ -35,7 +35,7 @@ import java.time.Instant
 import kotlin.time.Duration.Companion.seconds
 import kotlin.time.toJavaDuration
 
-interface ConnectionCheckService {
+fun interface ConnectionCheckService {
 
     fun connectionAvailable(): ConnectionCheckResult
 
@@ -88,7 +88,7 @@ class KafkaConnectionCheckService(
                 Instant.now(),
                 if (result.available == available) { result.lastChange } else { Instant.now() }
             )
-        } catch (e: TimeoutException) {
+        } catch (_: TimeoutException) {
             ConnectionCheckResult.KafkaConnectionCheckResult(
                 false,
                 Instant.now(),
@@ -138,7 +138,7 @@ class RestConnectionCheckService(
                 Instant.now(),
                 if (result.available == available) { result.lastChange } else { Instant.now() }
             )
-        } catch (e: Exception) {
+        } catch (_: Exception) {
             ConnectionCheckResult.RestConnectionCheckResult(
                 false,
                 Instant.now(),
@@ -191,7 +191,7 @@ class GPasConnectionCheckService(
                 Instant.now(),
                 if (result.available == available) { result.lastChange } else { Instant.now() }
             )
-        } catch (e: Exception) {
+        } catch (_: Exception) {
             ConnectionCheckResult.GPasConnectionCheckResult(
                 false,
                 Instant.now(),
diff --git a/src/main/kotlin/dev/dnpm/etl/processor/output/RestMtbFileSender.kt b/src/main/kotlin/dev/dnpm/etl/processor/output/RestMtbFileSender.kt
index 5ea42e3..016981c 100644
--- a/src/main/kotlin/dev/dnpm/etl/processor/output/RestMtbFileSender.kt
+++ b/src/main/kotlin/dev/dnpm/etl/processor/output/RestMtbFileSender.kt
@@ -103,7 +103,7 @@ abstract class RestMtbFileSender(
         val username = restTargetProperties.username
         val password = restTargetProperties.password
         val headers = HttpHeaders()
-        headers.setContentType(MediaType.APPLICATION_JSON)
+        headers.contentType = MediaType.APPLICATION_JSON
 
         if (username.isNullOrBlank() || password.isNullOrBlank()) {
             return headers