diff --git a/sandbox/build.gradle.kts b/sandbox/build.gradle.kts
index 2e8cb331c..b0edb7a44 100644
--- a/sandbox/build.gradle.kts
+++ b/sandbox/build.gradle.kts
@@ -83,8 +83,7 @@ kotlin {
 
             dependencies {
                 implementation(libs.ktor.client.core.jvm)
-                implementation(libs.kotlinx.coroutines.rx3)
-                implementation("io.reactivex.rxjava3:rxjava:3.1.9")
+                implementation("ch.qos.logback:logback-classic:1.2.3")
                 implementation(libs.ktor.client.logging)
                 implementation(libs.ktor.serialization.gson)
                 implementation(libs.ktor.client.cio.jvm)
diff --git a/sandbox/src/commonMain/kotlin/com/example/model/MyOwnResponseConverter.kt b/sandbox/src/commonMain/kotlin/com/example/model/MyOwnResponseConverterFactory.kt
similarity index 100%
rename from sandbox/src/commonMain/kotlin/com/example/model/MyOwnResponseConverter.kt
rename to sandbox/src/commonMain/kotlin/com/example/model/MyOwnResponseConverterFactory.kt
diff --git a/sandbox/src/jvmMain/kotlin/de/jensklingenberg/ktorfit/demo/JvMMain.kt b/sandbox/src/jvmMain/kotlin/de/jensklingenberg/ktorfit/demo/JvMMain.kt
index 65041ab35..9a82704e4 100644
--- a/sandbox/src/jvmMain/kotlin/de/jensklingenberg/ktorfit/demo/JvMMain.kt
+++ b/sandbox/src/jvmMain/kotlin/de/jensklingenberg/ktorfit/demo/JvMMain.kt
@@ -66,11 +66,11 @@ fun main() {
 
         when (user) {
             is MyOwnResponse.Success -> {
-                println(user.data)
+                System.out.println(user.data)
             }
 
             is MyOwnResponse.Error<*> -> {
-                println(user.ex)
+                System.out.println(user.ex)
             }
         }
         delay(3000)
diff --git a/sandbox/src/jvmMain/kotlin/de/jensklingenberg/ktorfit/demo/QueryTestApi.kt b/sandbox/src/jvmMain/kotlin/de/jensklingenberg/ktorfit/demo/QueryTestApi.kt
index 23a9d2ba5..76aae9eba 100644
--- a/sandbox/src/jvmMain/kotlin/de/jensklingenberg/ktorfit/demo/QueryTestApi.kt
+++ b/sandbox/src/jvmMain/kotlin/de/jensklingenberg/ktorfit/demo/QueryTestApi.kt
@@ -6,7 +6,6 @@ import de.jensklingenberg.ktorfit.http.Path
 import de.jensklingenberg.ktorfit.http.Query
 import de.jensklingenberg.ktorfit.http.QueryMap
 import de.jensklingenberg.ktorfit.http.QueryName
-import ktorfit.Test
 
 interface QueryTestApi {
     @GET("people/{id}/")
diff --git a/sandbox/src/jvmMain/kotlin/de/jensklingenberg/ktorfit/demo/TestApi.kt b/sandbox/src/jvmMain/kotlin/de/jensklingenberg/ktorfit/demo/TestApi.kt
index f07147314..b0cbef91f 100644
--- a/sandbox/src/jvmMain/kotlin/de/jensklingenberg/ktorfit/demo/TestApi.kt
+++ b/sandbox/src/jvmMain/kotlin/de/jensklingenberg/ktorfit/demo/TestApi.kt
@@ -2,9 +2,12 @@ package de.jensklingenberg.ktorfit.demo
 
 import com.example.model.Post
 import de.jensklingenberg.ktorfit.Call
-import de.jensklingenberg.ktorfit.http.*
-import io.ktor.client.request.forms.*
-import io.reactivex.rxjava3.core.Observable
+import de.jensklingenberg.ktorfit.http.Body
+import de.jensklingenberg.ktorfit.http.GET
+import de.jensklingenberg.ktorfit.http.Headers
+import de.jensklingenberg.ktorfit.http.POST
+import de.jensklingenberg.ktorfit.http.Path
+import io.ktor.client.request.forms.MultiPartFormDataContent
 import kotlinx.coroutines.flow.Flow
 
 interface TestApi {
@@ -34,8 +37,4 @@ interface TestApi {
     suspend fun uppi(
         @Body map: MultiPartFormDataContent
     )
-
-    @Headers(value = ["Accept: application/json"])
-    @GET("posts")
-    fun getObserPosts(): Observable<List<Post>>
 }
diff --git a/sandbox/src/jvmMain/kotlin/de/jensklingenberg/ktorfit/demo/TestApi2.kt b/sandbox/src/jvmMain/kotlin/de/jensklingenberg/ktorfit/demo/TestApi2.kt
index 8f47e9a09..54091ce50 100644
--- a/sandbox/src/jvmMain/kotlin/de/jensklingenberg/ktorfit/demo/TestApi2.kt
+++ b/sandbox/src/jvmMain/kotlin/de/jensklingenberg/ktorfit/demo/TestApi2.kt
@@ -1,4 +1,4 @@
-package ktorfit
+package de.jensklingenberg.ktorfit.demo
 
 import com.example.api.StarWarsApi
 import com.example.model.People