NoSuchMethodError: java.lang.Long.hashCode

Question

I have the following override of method on hashCode in AbstractORM class:

var _id = Random().nextLong()

override fun getId() = _id // AbstractORM class implements an interface that defines this method getId()

override fun hashCode() = getId().hashCode()

which suddenly started to throw the following exception:

FATAL EXCEPTION: main
java.lang.NoSuchMethodError: java.lang.Long.hashCode
   at com.company.ormlite.AbstractORM.hashCode(AbstractORM.kt:271)
   at java.util.HashMap.put(HashMap.java:390)
   at java.util.HashSet.add(HashSet.java:95)
   at kotlin.collections.ArraysKt___ArraysKt.toCollection(_Arrays.kt:6518)
   at kotlin.collections.ArraysKt___ArraysKt.toSet(_Arrays.kt:6853)
   at kotlin.collections.SetsKt__SetsKt.setOf(Sets.kt:32)
   at com.company.android.tna.orm.DataManager.getTables(DataManager.kt:16)
   at com.company.android.tna.orm.DataManager.getTables(DataManager.kt:10)
   at com.company.android.core.utils.AbstractDataManager.create(AbstractDataManager.kt:25)
   at com.company.android.core.utils.AbstractDataManager.start(AbstractDataManager.kt:44)
   at com.company.android.core.utils.AbstractZKApplication.onCreate(AbstractZKApplication.kt:54)
   at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:999)
   at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4151)
   at android.app.ActivityThread.access$1300(ActivityThread.java:130)
   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1255)
   at android.os.Handler.dispatchMessage(Handler.java:99)
   at android.os.Looper.loop(Looper.java:137)
   at android.app.ActivityThread.main(ActivityThread.java:4745)
   at java.lang.reflect.Method.invokeNative(Native Method)
   at java.lang.reflect.Method.invoke(Method.java:511)
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
   at dalvik.system.NativeStart.main(Native Method)

This has me dumbfounded for several reasons:

All classes in Java and Kotlin have hashCode method since it is inherited from Object or Any.
How can it not find a method that is on the Android SDK itself? If the SDK is not present, how is it running at all?
When inspecting that line of code in IntelliJ IDEA, it sends me to kotlin.Any.hashCode, not to java.lang.Long.hashcode.

Any insights would be greatly appreciated, thanks in advance.

can you post signature of `getId()` method along with imports? — Sachin Chandil, Aug 29 '17 at 09:55
@chandil03 I've added requested information. There are no imports relevant to these methods. All imports are from internal libraries for ORM and java.util. We have no other implementation of `Long`. — m0skit0, Aug 29 '17 at 09:59
I used your three lines, it is working fine. I did not override getId as i did not know which interface you are using. If you let me know the interface that you are implementing then i might be able to help. — Sachin Chandil, Aug 29 '17 at 10:33
@chandil03 Yeah it worked fine for me until yesterday, so it must be definitely something in my build messing it. I don't think the interface is related at all. It's just a simple interface with that method getId(), nothing more. — m0skit0, Aug 29 '17 at 10:35
Also upgrading kotlin from 1.3.20 to 1.3.30 causes this issue. See [this](https://youtrack.jetbrains.com/issue/KT-31027). — galcyurio, Apr 24 '19 at 01:53

m0skit0 · Accepted Answer · 2017-08-29T13:26:21.243

19

After checking the compiled AbstractORM class I found the problem: newer Kotlin versions generate a different code for that line

getId().hashCode()

Kotlin 1.1.2 generates the following code:

Long.valueOf(this.getId()).hashCode()

while newer versions of Kotlin generate this other code:

Long.hashCode(this.getId())

The problem is that this static method Long.hashCode(long) in Android is only available since API 24 (Android 7.0), while I'm testing on an Android device that has version 4.1 (API 16).

~~I'm temporarily fixing by calculating the hash code manually although I've opened an issue here.~~

override fun hashCode() = (getId() xor getId().ushr(32)).toInt()

As commented on the issue, switching to Java 1.6 target for the Kotlin compiler generates the old compatible code.

PS: I'm not 100% sure about those Kotlin versions, please take with a grain of salt.

edited Aug 29 '17 at 13:26

answered Aug 29 '17 at 12:43

m0skit0

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7

Be careful if you override such settings into your build.gradle file: `compileKotlin { kotlinOptions { jvmTarget = "1.6" } }` – Stéphane Péchard Mar 30 '18 at 12:52
1

@m0skit0 I am facing the same issue and I don't want to downgrade to JVM 1.6. Can you tell how to fix this issue for JVM 1.8 and API level less than 24 – Abdul Rehman Yawar Khan Oct 29 '18 at 20:22
@AbdulRehmanYawarKhan I'm same as you, using JVM 1.8 and API < 24, did you read answer? – m0skit0 Oct 30 '18 at 09:34
1

@StéphanePéchard I'm in love with you. – Vitor Hugo Schwaab Feb 05 '19 at 16:42
1

How is this not more of an issue for people? I ,like @AbdulRehmanYawarKhan, do not want to downgrade to 1.6 if it can be helped. – StuStirling Mar 07 '19 at 10:11
2

@StuStirling It's pretty simple: you can't use target 1.8 if your min SDK is less than 24. Devices with API < 24 do not support 1.8 features. – m0skit0 Mar 07 '19 at 10:12

score 5 · Answer 2 · answered Nov 07 '18 at 11:01

5

Overriding the hashCode() function, as m0skit0 suggested, worked for me. I implemented this:

override fun hashCode() : Int = id.toString().hashCode()

My Kotlin compiler setting in AndroidStudio is :

incremental compilation enabled
target JVM ver. 1.6

answered Nov 07 '18 at 11:01

marcinP

106
1
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much better solution from just dropping support to old APIs – Ahmed na Apr 16 '19 at 04:10
If you have Kotlin to compile to 1.6 you don't need this. – m0skit0 Apr 17 '19 at 13:42
@Ahmedna What do you mean "just dropping support to old APIs"? – m0skit0 Apr 18 '19 at 21:25
1

@m0skit0 with kotlin v 1.3.30 launched last week , while having 1.6 any device with api < 24 this error is thrown , grater APIs are working fine So i just need to avoid using these methods – Ahmed na Apr 19 '19 at 02:54
@Ahmedna Did you read my answer? You just have to set the Kotlin compiler to generate 1.6 compatible code. Doesn't matter which API or Kotlin version. – m0skit0 Apr 19 '19 at 09:06
1

@m0skit0 I've set complier to 1.6 everything was good until last week , I updated to kotlin 1.3.30 , all users with api < 24 started to crashed , I debugged with 1.6 and older version of kotlin all api were working , then with kotlin 1.3.30 all APIs pre 24 crashed – Ahmed na Apr 19 '19 at 15:24
Targetting JVM to v1.6 is not mandatory. Anyway, thank you, it works. – Rubén Viguera Sep 13 '19 at 08:34

score 3 · Answer 3 · answered Aug 29 '17 at 10:06

3

I'm not sure about how to solve your problem, but I'll try to explain why are you getting this exception.

In Java 8 a new static method was added to a Long class:

public static int hashCode(long value)

And since then hashCode() method looks like this:

public int hashCode() {
    return hashCode(this.value); // call Long.hashCode() static method
}

So it seems that you have some issues with Java version.

answered Aug 29 '17 at 10:06

Alex Romanov

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Sorry, I don't understand how this explains anything about my error. – m0skit0 Aug 29 '17 at 10:10
Most probably you're trying to run Java 8 compiled code on JVM that does not support 1.8 features. – Alex Romanov Aug 29 '17 at 10:28
Definitely not, this is Android and it is always set to Java 6. In any case I checked again the Java version target and it is 6. Also I'm not calling that new static method, note it has a parameter. – m0skit0 Aug 29 '17 at 10:31
But it is definitely something broken in my build, some Kotlin versions or something, thanks for putting me on that way! – m0skit0 Aug 29 '17 at 10:37
@m0skit0 may be your java 6 is having this issue as it is too old. try switching to 7 or 8. – Sachin Chandil Aug 29 '17 at 11:18
Android is Java 6 only :) – m0skit0 Aug 29 '17 at 11:19

score 3 · Answer 4 · answered May 12 '20 at 08:57

I've encountered the same issue and the solution for me is to assign both compileOptions and kotlinOptions in build.gradle to version 1.8

android {
  ...
  // Configure only for each module that uses Java 8
  // language features (either in its source code or
  // through dependencies).
  compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
  }
  // For Kotlin projects
  kotlinOptions {
    jvmTarget = "1.8"
  }
}

Referenced from Use Java 8 language features of Android Developers official website.

If you want to upgrade to Java 8, yes, this is valid solution. — m0skit0, May 12 '20 at 13:32

NoSuchMethodError: java.lang.Long.hashCode

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