Realm does not support Kotlin ByteArray type (java byte[])

[filipkowicz]

Goal

use ByteArray ( kotlin's byte[] alias) with Realm

example:
open class TestModel( @RealmField(name = "test") var test: ByteArray? = ByteArray(0)): RealmObject()

Expected Results

compiles fine

Actual Results

error: Field "test" of type "(@org.jetbrains.annotations.Nullable :: byte)[]" is not supported.

Code Sample

kotlin version which does not compile:
open class TestModel(
        @RealmField(name = "test")
        var test: ByteArray? = ByteArray(0)): RealmObject()`

java version which compile fine:
public class TestModel extends RealmObject {
    @RealmField(name = "test")
    public byte[] test;
}

Version of Realm and tooling

Realm version(s): ?=5.5.0

Realm sync feature enabled: no

Android Studio version: 3.2

Which Android version and device: emulator 8.0

[Zhuinden]

Have you tried ByteArray instead of ByteArray??

[filipkowicz]

same thing:

open class TestModel(
        @RealmField(name = "test")
        var test: ByteArray = ByteArray(0)

): RealmObject()

gives java class:

@kotlin.Metadata(mv = {1, 1, 11}, bv = {1, 0, 2}, k = 1, d1 = {"\u0000\u0012\n\u0002\u0018\u0002\n\u0002\u0018\u0002\n\u0000\n\u0002\u0010\u0012\n\u0002\b\u0005\b\u0016\u0018\u00002\u00020\u0001B\u000f\u0012\b\b\u0002\u0010\u0002\u001a\u00020\u0003\u00a2\u0006\u0002\u0010\u0004R\u001e\u0010\u0002\u001a\u00020\u00038\u0006@\u0006X\u0087\u000e\u00a2\u0006\u000e\n\u0000\u001a\u0004\b\u0005\u0010\u0006\"\u0004\b\u0007\u0010\u0004\u00a8\u0006\b"}, d2 = {"Lch/sherpany/boardroom/model/encryption/TestModel;", "Lio/realm/RealmObject;", "test", "", "([B)V", "getTest", "()[B", "setTest", "app_debug"})
public class TestModel extends io.realm.RealmObject {
    @org.jetbrains.annotations.NotNull()
    @io.realm.annotations.RealmField(name = "test")
    private byte[] test;
    
    @org.jetbrains.annotations.NotNull()
    public final byte[] getTest() {
        return null;
    }
    
    public final void setTest(@org.jetbrains.annotations.NotNull()
    byte[] p0) {
    }
    
    public TestModel(@org.jetbrains.annotations.NotNull()
    byte[] test) {
        super();
    }
    
    public TestModel() {
        super();
    }
}

I think that annotation @org.jetbrains.annotations.NotNull() could be a problem

[filipkowicz]

I've done little research and:
Constants.JAVA_TO_REALM_TYPES has "byte[]" (string) as Type. Then it's used to check supported field types in RealmProxyClassGenerator.emitPersistedFieldAccessors where field.asType().toString()= fieldTypeCanonicalName should be byte[] but it is (@org.jetbrains.annotations.NotNull :: byte)[]

[cruxdyno]

I had the same error after updating some library versions. These two caused it:

• updating com.bluelinelabs:conductor & support from 2.1.4 to 2.1.5
• or updating com.jakewharton.timber:timber:4.5.1 to 4.7.1

I tried with realm 4.1.1 and 5.8.0, but it didn't help. conductor and timber were the problems for me. I assume this behavior is a bug in annotation processing from some other library or plugin, so your solution might be different than mine, but I suggest you check whether you updated any libraries.

[Grohden]

I've got this after adding Timber 4.7.1 to the project
This is the log:

Equipment.java:18: error: Field "workCenterCode" of type "(@org.jetbrains.annotations.Nullable :: java.lang.String)" is not supported.

[Grohden]

Maybe this is related?
JakeWharton/timber#295

[Grohden]

Changing the nullable import from
import org.jetbrains.annotations.Nullable; to import android.support.annotation.Nullable;
Fixed the build for me. But i'm not sure what changes with this...

[edgar-zigis]

I've got this after adding Timber 4.7.1 to the project
This is the log:

Equipment.java:18: error: Field "workCenterCode" of type "(@org.jetbrains.annotations.Nullable :: java.lang.String)" is not supported.

Same here, issue appeared after updating Timber to 4.7.1

[zeroarst]

Having the same issue with Timber 4.7.1...anyone found the solution..?

[phamquan]

It seems to be the only solution now is to downgrade Timber to 4.5.0

[jeromep01]

i can confirm that byte[] instead of nullable byte[] works

[VitalyKolchenko]

api("com.jakewharton.timber:timber:4.7.1") {
        exclude group: "org.jetbrains", module: "annotations"
    }

Does the thing

[paulelias]

Changing the nullable import from
import org.jetbrains.annotations.Nullable; to import android.support.annotation.Nullable;
Fixed the build for me. But i'm not sure what changes with this...

I'm new to Kotlin and Android. I'm trying to compile a project that uses Realm and there's a class that produces the same error about "@org.jetbrains.annotations.NotNull byte[] is not supported". I want to try replacing the jetbrains Nullable annotation with the android annotation but I can't figure out how to do that. It seems that no matter what I try, the class is always compiled with the jetbrains annotation and I get the error. I'm sure there's something basic I'm missing but I've spent several hours searching stack overflow and other sites without any luck. Can anyone point me in the right direction? Thanks!

[Grohden]

@paulelias it's probably imported somewhere else 🤔 I would search the entire project for it (if recall the shortcut in android studio for search everywhere is shift+shift, you can search for the import or review all nullable annotations in the project just to be sure)

Intellij/Android Studio also might have added it to build gradle (don't think that it does this.. but doesn't hurt to give a look), but since you said it gives this error in a class it might be cache... ./gradlew clean probably can solve in this case I think

[paulelias]

I solved my problem by creating a small Java class that contained the byte array. It avoids the annotation. Thanks!

[ntoskrnl]

subprojects {
  configurations.all {
    resolutionStrategy.force 'org.jetbrains:annotations:13.0'
  }
}

also works

[brucemax]

Just adding constraint layout library for compose to project breaks the build. What!?