diff --git a/webapi/src/main/scala/org/knora/webapi/messages/util/search/gravsearch/types/InferringGravsearchTypeInspector.scala b/webapi/src/main/scala/org/knora/webapi/messages/util/search/gravsearch/types/InferringGravsearchTypeInspector.scala
index d3b1cebba1..385d78fda2 100644
--- a/webapi/src/main/scala/org/knora/webapi/messages/util/search/gravsearch/types/InferringGravsearchTypeInspector.scala
+++ b/webapi/src/main/scala/org/knora/webapi/messages/util/search/gravsearch/types/InferringGravsearchTypeInspector.scala
@@ -1485,6 +1485,8 @@ class InferringGravsearchTypeInspector(nextInspector: Option[GravsearchTypeInspe
                 rightEntity = rightIriRef,
                 usageIndex = usageIndex
               )
+
+            case _ => throw GravsearchException(s"An invalid `rightEntity` with value: $rightEntity was used.")
           }
 
         case _ =>
diff --git a/webapi/src/main/scala/org/knora/webapi/responders/v1/CkanResponderV1.scala b/webapi/src/main/scala/org/knora/webapi/responders/v1/CkanResponderV1.scala
index 6ddf2e30b9..9b56693e76 100644
--- a/webapi/src/main/scala/org/knora/webapi/responders/v1/CkanResponderV1.scala
+++ b/webapi/src/main/scala/org/knora/webapi/responders/v1/CkanResponderV1.scala
@@ -216,7 +216,7 @@ class CkanResponderV1(responderData: ResponderData) extends Responder(responderD
 
       result = limit match {
         case Some(n) if n > 0 => bilder.take(n)
-        case None             => bilder
+        case _                => bilder
       }
 
     } yield result
@@ -344,7 +344,7 @@ class CkanResponderV1(responderData: ResponderData) extends Responder(responderD
 
       result = limit match {
         case Some(n) if n > 0 => booksWithPages.take(n)
-        case None             => booksWithPages
+        case _                => booksWithPages
       }
 
     } yield result
@@ -412,7 +412,7 @@ class CkanResponderV1(responderData: ResponderData) extends Responder(responderD
       resIri = resourcesResponseRows.groupBy(_.rowMap("s")).keys.toVector
       result = limit match {
         case Some(n) if n > 0 => resIri.take(n)
-        case None             => resIri
+        case _                => resIri
       }
     } yield result
 
diff --git a/webapi/src/main/scala/org/knora/webapi/responders/v2/ResourcesResponderV2.scala b/webapi/src/main/scala/org/knora/webapi/responders/v2/ResourcesResponderV2.scala
index fbb98a715f..3ecbc2538d 100644
--- a/webapi/src/main/scala/org/knora/webapi/responders/v2/ResourcesResponderV2.scala
+++ b/webapi/src/main/scala/org/knora/webapi/responders/v2/ResourcesResponderV2.scala
@@ -1752,7 +1752,7 @@ class ResourcesResponderV2(responderData: ResponderData) extends ResponderWithSt
               }
           }
 
-        case None =>
+        case _ =>
           throw InconsistentRepositoryDataException(
             s"Resource $gravsearchTemplateIri has no property ${OntologyConstants.KnoraBase.HasTextFileValue}"
           )
@@ -1828,7 +1828,7 @@ class ResourcesResponderV2(responderData: ResponderData) extends ResponderWithSt
               )
           }
 
-        case None => throw BadRequestException(s"$textProperty is expected to occur once on $resourceIri")
+        case _ => throw BadRequestException(s"$textProperty is expected to occur once on $resourceIri")
       }
 
     /**
diff --git a/webapi/src/main/scala/org/knora/webapi/responders/v2/StandoffResponderV2.scala b/webapi/src/main/scala/org/knora/webapi/responders/v2/StandoffResponderV2.scala
index 56ffbd127f..3a62dc53f9 100644
--- a/webapi/src/main/scala/org/knora/webapi/responders/v2/StandoffResponderV2.scala
+++ b/webapi/src/main/scala/org/knora/webapi/responders/v2/StandoffResponderV2.scala
@@ -224,9 +224,9 @@ class StandoffResponderV2(responderData: ResponderData) extends Responder(respon
               }
           }
 
-        case None =>
+        case _ =>
           throw InconsistentRepositoryDataException(
-            s"${OntologyConstants.KnoraBase.XSLTransformation} has no property ${OntologyConstants.KnoraBase.HasTextFileValue}"
+            s"${OntologyConstants.KnoraBase.XSLTransformation} has no or more than one property ${OntologyConstants.KnoraBase.HasTextFileValue}"
           )
       }
 
diff --git a/webapi/src/main/scala/org/knora/webapi/routing/admin/StoreRouteADM.scala b/webapi/src/main/scala/org/knora/webapi/routing/admin/StoreRouteADM.scala
index f81dcb91e7..bb24268231 100644
--- a/webapi/src/main/scala/org/knora/webapi/routing/admin/StoreRouteADM.scala
+++ b/webapi/src/main/scala/org/knora/webapi/routing/admin/StoreRouteADM.scala
@@ -48,7 +48,7 @@ class StoreRouteADM(routeData: KnoraRouteData)
       post {
         /* ResetTriplestoreContent */
         entity(as[Seq[RdfDataObject]]) { apiRequest =>
-          parameter('prependdefaults.as[Boolean] ? true) { prependDefaults => requestContext =>
+          parameter(Symbol("prependdefaults").as[Boolean] ? true) { prependDefaults => requestContext =>
             val msg = ResetTriplestoreContentRequestADM(
               rdfDataObjects = apiRequest,
               prependDefaults = prependDefaults,
diff --git a/webapi/src/main/scala/org/knora/webapi/routing/v1/CkanRouteV1.scala b/webapi/src/main/scala/org/knora/webapi/routing/v1/CkanRouteV1.scala
index 2ba506f4a8..2c9c1b736e 100644
--- a/webapi/src/main/scala/org/knora/webapi/routing/v1/CkanRouteV1.scala
+++ b/webapi/src/main/scala/org/knora/webapi/routing/v1/CkanRouteV1.scala
@@ -28,7 +28,7 @@ class CkanRouteV1(routeData: KnoraRouteData) extends KnoraRoute(routeData) with
             featureFactoryConfig = featureFactoryConfig
           )
           params = requestContext.request.uri.query().toMap
-          project: Option[Seq[String]] = params.get("project").map(_.split(","))
+          project: Option[Seq[String]] = params.get("project").map(_.split(",").toSeq)
           limit: Option[Int] = params.get("limit").map(_.toInt)
           info: Boolean = params.getOrElse("info", false) == true
         } yield CkanRequestV1(
diff --git a/webapi/src/main/scala/org/knora/webapi/routing/v1/ResourcesRouteV1.scala b/webapi/src/main/scala/org/knora/webapi/routing/v1/ResourcesRouteV1.scala
index fa63372d97..77f9e44c8f 100644
--- a/webapi/src/main/scala/org/knora/webapi/routing/v1/ResourcesRouteV1.scala
+++ b/webapi/src/main/scala/org/knora/webapi/routing/v1/ResourcesRouteV1.scala
@@ -1135,7 +1135,7 @@ class ResourcesRouteV1(routeData: KnoraRouteData) extends KnoraRoute(routeData)
                     timeVal,
                     throw BadRequestException(s"Invalid decimal value in element '${node.label}: '$timeVal'")
                   )
-                }
+                }.toSeq
 
                 CreateResourceValueV1(interval_value = Some(tVals))
 
diff --git a/webapi/src/main/scala/org/knora/webapi/routing/v2/AuthenticationRouteV2.scala b/webapi/src/main/scala/org/knora/webapi/routing/v2/AuthenticationRouteV2.scala
index ea44925b1e..614be8cdea 100644
--- a/webapi/src/main/scala/org/knora/webapi/routing/v2/AuthenticationRouteV2.scala
+++ b/webapi/src/main/scala/org/knora/webapi/routing/v2/AuthenticationRouteV2.scala
@@ -83,7 +83,7 @@ class AuthenticationRouteV2(routeData: KnoraRouteData)
             }
         } ~
           post { // called by html login interface (necessary for IIIF Authentication API support)
-            formFields('username, 'password) { (username, password) => requestContext =>
+            formFields(Symbol("username"), Symbol("password")) { (username, password) => requestContext =>
               {
                 requestContext.complete {
                   doLoginV2(
diff --git a/webapi/src/test/scala/org/knora/webapi/e2e/v1/ValuesV1R2RSpec.scala b/webapi/src/test/scala/org/knora/webapi/e2e/v1/ValuesV1R2RSpec.scala
index 974143d598..bdee731d81 100644
--- a/webapi/src/test/scala/org/knora/webapi/e2e/v1/ValuesV1R2RSpec.scala
+++ b/webapi/src/test/scala/org/knora/webapi/e2e/v1/ValuesV1R2RSpec.scala
@@ -268,6 +268,7 @@ class ValuesV1R2RSpec extends R2RSpec {
 
         val (mostRecentVersion, originalVersion) = versionHistory match {
           case JsArray(Vector(mostRecent, original)) => (mostRecent.asJsObject.fields, original.asJsObject.fields)
+          case _                                     => fail("expected an array, but got something else.")
         }
 
         assert(