Hi! i have runned into some issue, i have this simple get endpoint that returns a large bytearray: `...

# ktor

[Joakim Taule Kartveit]

Hi!
i have runned into some issue, i have this simple get endpoint that returns a large bytearray:

package com.example.plugins

import io.ktor.server.application.*
import io.ktor.server.response.*
import io.ktor.server.routing.*

fun Application.configureRouting() {
    routing {
        get("/") {
            val byteArray = ByteArray(400000000)
            call.respondBytes(byteArray)
        }
    }
}

This works fine, but when i try to create a unit test based on this like so:

package com.example.plugins

import io.ktor.client.request.*
import io.ktor.http.*
import io.ktor.server.response.*
import io.ktor.server.routing.*
import io.ktor.server.testing.*
import org.junit.jupiter.api.Assertions.assertEquals
import org.junit.jupiter.api.Test

internal class RoutingTest {

    @Test
    internal fun `Returns ok on big bytearray`() {
        testApplication {
            application {
                routing {
                    get("/") {
                        val byteArray = ByteArray(400000000)
                        call.respondBytes(byteArray)
                    }
                }
            }
            val response = client.get("/")

            assertEquals(HttpStatusCode.OK, response.status)
        }
    }
}

Then i get this exception:
Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "DefaultDispatcher-worker-1"
Is it my test that are incorrect?

[gpopides]

can you increase the heap size for the test task?

[Joakim Taule Kartveit]

Yes, have given it 8192m.
But same issue.

When i decrease the bytearray from:

val byteArray = ByteArray(400000000)

to

val byteArray = ByteArray(100000000)

it works fine.

[gpopides]

i run it locally and apart from taking quite some time (10-15seconds) i didnt get a memory error

[Joakim Taule Kartveit]

okay, then its probly some local issue with me and increasing the heap size

[Joakim Taule Kartveit]

Ty

[gpopides]

maybe you can increase the gradle heap in the ide

[Joakim Taule Kartveit]

like this maybe?

kotlin.daemon.jvmargs=-Xms4096m -Xmx6048m

[gpopides]

yes that should work for gradle

[Joakim Taule Kartveit]

Nice, got it to work now 😄

[Joakim Taule Kartveit]

hm, the best way for me to increase the heap size only for the test, was this in the build.gradle.kts:

tasks {
    test {
        minHeapSize = "1048m"
        maxHeapSize = "2096m"
        useJUnitPlatform {}
        testLogging.showStandardStreams = true
    }
}

[gpopides]

yes that what i meant with increasing the size for the test 🙂


usually tasks.withType<Test> {} which is how its done in latest versions