build.gradle

@@ -12,8 +12,8 @@ buildscript {
 }
 
 tasks.withType(JavaCompile) {
-    sourceCompatibility = JavaVersion.VERSION_11
-    targetCompatibility = JavaVersion.VERSION_11
+    sourceCompatibility = JavaVersion.VERSION_1_8
+    targetCompatibility = JavaVersion.VERSION_1_8
 }
 
 apply plugin: 'kotlin'
@@ -65,7 +65,7 @@ kotlin.experimental.coroutines = 'enable'
 
 tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).all {
     kotlinOptions {
-        jvmTarget = "11"
+        jvmTarget = "1.8"
     }
 }
 

src/api/route/InputServiceServer.kt

@@ -30,6 +30,7 @@ import java.io.InputStream
 import java.io.OutputStream
 import java.time.LocalDate
 import java.util.*
+import javax.activation.MimetypesFileTypeMap
 
 /**
  * Input Service