While uploading file via Ktor we are facing this `NullPointe kotlinlang #ktor

While uploading file via Ktor we are facing this `...

Suresh Maidaragi

11/30/2023, 11:31 AM

While uploading file via Ktor we are facing this

NullPointerException

Suresh Maidaragi

11/30/2023, 11:31 AM

can someone please help to know what are we missing on implementation, here is the sample code

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fun uploadFile(url: String, filename: String, key: String = "json"): HttpResponse {
    return runBlocking {
        val headers = Headers.build {
            append(HttpHeaders.ContentType, ContentType.Application.Json)
            append(HttpHeaders.ContentDisposition, "filename=$filename")
        }

        val response: HttpResponse = httpClient.submitFormWithBinaryData(
            url = url,
            formData = formData {
                append(key, File(filename).readBytes(), headers)
            }
        ) {
            onUpload { bytesSentTotal, contentLength ->
                println("Sent $bytesSentTotal bytes from $contentLength")
            }
            method = HttpMethod.Put
        }

        println(response.readText())
        return@runBlocking response
    }
}

Aleksei Tirman [JB]

11/30/2023, 11:37 AM

Can you share the stack trace as text?

Suresh Maidaragi

11/30/2023, 12:07 PM

stack.rtf

Aleksei Tirman [JB]

11/30/2023, 12:08 PM

Untitled

Aleksei Tirman [JB]

11/30/2023, 12:10 PM

I can't see the

NullPointerException

in the stack trace.

Suresh Maidaragi

11/30/2023, 12:12 PM

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2023-11-30 17:40:29.566 31430-31457 System.out              xyz.penpencil.unigo                  I  java.lang.NullPointerException
2023-11-30 17:40:29.566 31430-31457 System.out              xyz.penpencil.unigo                  I  	at io.ktor.client.plugins.ContentNegotiation$Plugin$install$1.invokeSuspend(ContentNegotiation.kt:109)
2023-11-30 17:40:29.566 31430-31457 System.out              xyz.penpencil.unigo                  I  	at io.ktor.client.plugins.ContentNegotiation$Plugin$install$1.invoke(Unknown Source:13)
2023-11-30 17:40:29.566 31430-31457 System.out              xyz.penpencil.unigo                  I  	at io.ktor.client.plugins.ContentNegotiation$Plugin$install$1.invoke(Unknown Source:4)
2023-11-30 17:40:29.566 31430-31457 System.out              xyz.penpencil.unigo                  I  	at io.ktor.util.pipeline.SuspendFunctionGun.loop(SuspendFunctionGun.kt:120)
2023-11-30 17:40:29.566 31430-31457 System.out              xyz.penpencil.unigo                  I  	at io.ktor.util.pipeline.SuspendFunctionGun.proceed(SuspendFunctionGun.kt:78)
2023-11-30 17:40:29.566 31430-31457 System.out              xyz.penpencil.unigo                  I  	at io.ktor.util.pipeline.SuspendFunctionGun.proceedWith(SuspendFunctionGun.kt:88)
2023-11-30 17:40:29.566 31430-31457 System.out              xyz.penpencil.unigo                  I  	at io.ktor.client.plugins.HttpCallValidator$Companion$install$1.invokeSuspend(HttpCallValidator.kt:130)
2023-11-30 17:40:29.566 31430-31457 System.out              xyz.penpencil.unigo                  I  	at io.ktor.client.plugins.HttpCallValidator$Companion$install$1.invoke(Unknown Source:13)
2023-11-30 17:40:29.566 31430-31457 System.out              xyz.penpencil.unigo                  I  	at io.ktor.client.plugins.HttpCallValidator$Companion$install$1.invoke(Unknown Source:4)
2023-11-30 17:40:29.566 31430-31457 System.out              xyz.penpencil.unigo                  I  	at io.ktor.util.pipeline.SuspendFunctionGun.loop(SuspendFunctionGun.kt:120)
2023-11-30 17:40:29.566 31430-31457 System.out              xyz.penpencil.unigo                  I  	at io.ktor.util.pipeline.SuspendFunctionGun.proceed(SuspendFunctionGun.kt:78)
2023-11-30 17:40:29.566 31430-31457 System.out              xyz.penpencil.unigo                  I  	at io.ktor.client.plugins.HttpRequestLifecycle$Plugin$install$1.invokeSuspend(HttpRequestLifecycle.kt:38)
2023-11-30 17:40:29.566 31430-31457 System.out              xyz.penpencil.unigo                  I  	at io.ktor.client.plugins.HttpRequestLifecycle$Plugin$install$1.invoke(Unknown Source:11)
2023-11-30 17:40:29.566 31430-31457 System.out              xyz.penpencil.unigo                  I  	at io.ktor.client.plugins.HttpRequestLifecycle$Plugin$install$1.invoke(Unknown Source:4)
2023-11-30 17:40:29.566 31430-31457 System.out              xyz.penpencil.unigo                  I  	at io.ktor.util.pipeline.SuspendFunctionGun.loop(SuspendFunctionGun.kt:120)
2023-11-30 17:40:29.566 31430-31457 System.out              xyz.penpencil.unigo                  I  	at io.ktor.util.pipeline.SuspendFunctionGun.proceed(SuspendFunctionGun.kt:78)
2023-11-30 17:40:29.566 31430-31457 System.out              xyz.penpencil.unigo                  I  	at io.ktor.util.pipeline.SuspendFunctionGun.execute$ktor_utils(SuspendFunctionGun.kt:98)
2023-11-30 17:40:29.567 31430-31457 System.out              xyz.penpencil.unigo                  I  	at io.ktor.util.pipeline.Pipeline.execute(Pipeline.kt:77)
2023-11-30 17:40:29.567 31430-31457 System.out              xyz.penpencil.unigo                  I  	at io.ktor.client.HttpClient.execute$ktor_client_core(HttpClient.kt:191)
2023-11-30 17:40:29.567 31430-31457 System.out              xyz.penpencil.unigo                  I  	at io.ktor.client.statement.HttpStatement.executeUnsafe(HttpStatement.kt:108)
2023-11-30 17:40:29.567 31430-31457 System.out              xyz.penpencil.unigo                  I  	at io.ktor.client.statement.HttpStatement.execute(HttpStatement.kt:47)
2023-11-30 17:40:29.567 31430-31457 System.out              xyz.penpencil.unigo                  I  	at io.ktor.client.statement.HttpStatement.execute(HttpStatement.kt:62)
2023-11-30 17:40:29.567 31430-31457 System.out              xyz.penpencil.unigo                  I  	at utils.fileupload.FileUploadServiceImpl.uploadFile(FileUploadServiceImpl.kt:105)
2023-11-30 17:40:29.567 31430-31457 System.out              xyz.penpencil.unigo                  I  	at utils.fileupload.FileUploadRepositoryImp$upload$2.invokeSuspend(FileUploadRepositoryImp.kt:17)
2023-11-30 17:40:29.567 31430-31457 System.out              xyz.penpencil.unigo                  I  	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
2023-11-30 17:40:29.567 31430-31457 System.out              xyz.penpencil.unigo                  I  	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:108)
2023-11-30 17:40:29.567 31430-31457 System.out              xyz.penpencil.unigo                  I  	at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:584)
2023-11-30 17:40:29.567 31430-31457 System.out              xyz.penpencil.unigo                  I  	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:793)
2023-11-30 17:40:29.567 31430-31457 System.out              xyz.penpencil.unigo                  I  	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:697)
2023-11-30 17:40:29.567 31430-31457 System.out              xyz.penpencil.unigo                  I  	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:684)
2023-11-30 17:40:29.568 31430-31430 System.out              xyz.penpencil.unigo                  I  Suresh base.domain.ResourceError$Unknown@a6bb78

Suresh Maidaragi

11/30/2023, 12:26 PM

@Aleksei Tirman [JB] hope this helps you?

Aleksei Tirman [JB]

11/30/2023, 12:40 PM

Can you share the

HttpClient

initialization code (

httpClient

Suresh Maidaragi

11/30/2023, 2:22 PM

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module {
        single<HttpClient> {
            HttpClient {
                // converts response into dto objects
                install(ContentNegotiation) {
                    json(HttpClientUtil.nonStrictJson)
                }

                // Log HTTP request and response
                install(Logging) {
                    logger = HttpClientLogger // custom logger
                    level = LogLevel.ALL
                }.also { initLogger() } // this will initialise napier for both platform

                defaultRequest {
                    // Set the Content-Type header for each request
                    header(HttpHeaders.ContentType, ContentType.Application.Json.toString())
                    header("Client-id", ORG_ID)
                }
            }
        }

        single<KtorApiService> { KtorApiServiceImp(get<HttpClient>()) }
    }

Suresh Maidaragi

11/30/2023, 2:22 PM

im using koin

Aleksei Tirman [JB]

11/30/2023, 2:28 PM

What version of Ktor do you use? Can you try replacing the

response.readText()

line with

response.bodyAsText()

one?

Suresh Maidaragi

11/30/2023, 2:28 PM

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2.0.0-beta-1

Aleksei Tirman [JB]

11/30/2023, 2:29 PM

Can you use the latest released version 2.3.6?

Suresh Maidaragi

11/30/2023, 2:30 PM

okay I will try both suggestion will let you know

Suresh Maidaragi

11/30/2023, 2:31 PM

btw im using this in KMM android and iOS project

Suresh Maidaragi

12/01/2023, 1:12 AM

@Aleksei Tirman [JB] thanks a lot updating ktor along with that setting up platform specific http client to ktor helped

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HttpClient(engine = getHttpClientEngine())

ios

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actual fun getHttpClientEngine() = Darwin.create()

android

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actual fun getHttpClientEngine() = OkHttp.create {

}

Suresh Maidaragi

12/01/2023, 5:55 AM

@Aleksei Tirman [JB] we are started seeing new issue when we run build on iOS but android build works fine https://kotlinlang.slack.com/archives/C0A974TJ9/p1701410061728279

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