Crash when trying to call a suspend method within rxSingle {}

[ravi-paystack]

Hi,

I am getting a crash when I try to call a suspend method from an rx chain. The rx chain previously had a method that was returning Single<SomeType> which is now changed to a suspend method. But when I use rxSingle to change the behavior to return Single , it crashes with the following log,

java.lang.NoSuchMethodError: No direct method <init>(Lkotlin/coroutines/CoroutineContext;Z)V in class Lkotlinx/coroutines/AbstractCoroutine; or its super classes (declaration of 'kotlinx.coroutines.AbstractCoroutine' appears in /data/app/com.paystack.pos.staging-3/base.apk:classes18.dex)
        at kotlinx.coroutines.rx2.RxSingleCoroutine.<init>(RxSingle.kt:56)
        at kotlinx.coroutines.rx2.RxSingleKt$rxSingleInternal$1.subscribe(RxSingle.kt:48)
        at io.reactivex.internal.operators.single.SingleCreate.subscribeActual(SingleCreate.java:39)
        at io.reactivex.Single.subscribe(Single.java:3603)
        at io.reactivex.internal.operators.single.SingleFlatMap.subscribeActual(SingleFlatMap.java:36)
        at io.reactivex.Single.subscribe(Single.java:3603)
        at io.reactivex.Single.subscribeWith(Single.java:3650)

I tried to do this in a test and it crashed with the same reason as above.

suspend fun sayHello(): String {
        delay(1000)
        return "Hello"
    }

    fun sayHelloSingle(): Single<String> = rxSingle { sayHello() }

    @Test
    fun testSingle(){

        sayHelloSingle().test().assertValue("Hello")
    }

Not sure what I am doing wrong. I am using version 1.4.3 for both org.jetbrains.kotlinx:kotlinx-coroutines-rx2 and org.jetbrains.kotlinx:kotlinx-coroutines-core and version 2.2.10 for rxJava. Thank you for the help 🙏🏼

[qwwdfsad]

Hi, it seems like you have mismatched versions of kotlinx-coroutine-rx2 and kotlinx-coroutines-core. It's likely that higher version comes from some dependency transitively and wins gradle dependency resolution.
./gradlew :yourTask --scan can provide an additional insight for you.

There are multiple options:

• Figure out where the inconsistency comes from and fix it by forcing the version
• Update to coroutines 1.6.0 where we implemented Gradle platform support to have dependencies aligned: Binary incompatibitlity between different kotlinx-coroutines modules #2865