ToOne object is null inside com.jega.entity.UserEntity

[jegalirisoft]

I've entity class with ToOne relation. when we query the parent class we are seeing the exception java.lang.IllegalStateException: ToOne object is null inside com.jega.entity.UserEntity

Entity class

@Entity
data class UserEntity(
    @Id
    var id: Long = 0,
    var name: String
) {
    var address: ToOne<AddressEntity>? = null
}


@Entity
data class AddressEntity(
    @Id
    var id: Long=0,
    var streetLine: String,
    var streetLine2: String,
    var locality: String,
    var city: String,
    var state: String,
    var zipcode: String,
    var landmark: String? = null
)

Exception

java.lang.IllegalStateException: ToOne object is null inside com.jega.entity.UserEntity
at io.objectbox.Cursor.nativeFirstEntity(Native Method)
at io.objectbox.Cursor.first(Cursor.java:197)
at io.objectbox.Box.getAll(Box.java:310)

[greenrobot-team]

Can you please share more about your setup? E.g. is this Android? Is this on device? Is this a local/instrumented test?

This may be related to the byte code transformer not running, which adds initializers for ToOne. See https://docs.objectbox.io/relations#initialization-magic

[jegalirisoft]

@greenrobot-team it is an android project and running on android device Samsung s9 (Android 11).

I'm using Mac OS bigger 11.4 and Android studio version 4.2.1

objectboxVersion = '2.9.1'

---

Gradle 6.7.1

Build time: 2020-11-16 17:09:24 UTC
Revision: 2972ff02f3210d2ceed2f1ea880f026acfbab5c0

Kotlin: 1.3.72
Groovy: 2.5.12
Ant: Apache Ant(TM) version 1.10.8 compiled on May 10 2020
JVM: 15.0.1 (Oracle Corporation 15.0.1+9)
OS: Mac OS X 11.4 x86_64

[jegalirisoft]

@greenrobot-team any updates ?

[greenrobot-team]

Try to change your property to lateinit var address: ToOne<AddressEntity> like the docs https://docs.objectbox.io/relations#to-one-relations suggest.

If that won't help, as I said, see https://docs.objectbox.io/relations#initialization-magic on how to add the initializer yourself.

[fllaryora]

Hi I am getting the same issue

ext.kotlin_version = '1.3.41'
ext.objectboxVersion = '2.5.1'
classpath "io.objectbox:objectbox-gradle-plugin:$objectboxVersion"

the green bot suggestions did not worked for me.

import io.objectbox.annotation.Entity
import io.objectbox.annotation.Id
import io.objectbox.annotation.Unique
import java.io.Serializable

@Entity
data class Pill (
    @Id
    var id: Long = 0,///must be called id and must be a Long :(
    @Unique
    val name: String
) : Serializable


import io.objectbox.annotation.Entity
import io.objectbox.annotation.Id
import io.objectbox.relation.ToOne

@Entity
data class PillTaken (
    @Id
    var id: Long = 0L,///must be called id and must be a Long :(
)  {
    lateinit var pill: ToOne<Pill>
}

I can add (I guess)

val supradin: Pill = Pill(0L, "Supradin Forte")
            val totalMagneciano: Pill = Pill(0L, "Total Magneciano")
            var pillList: List<Pill> = listOf(supradin, totalMagneciano)
            pillList.forEach { PillDAO.insert(it) }

 pillList.forEach {
                        val pillTaken = PillTaken(0L)
                        pillTaken.pill = ToOne<Pill>(pillTaken, PillTaken_.pill)
                        pillTaken.pill.target = it
                        PillTakenDAO.insert(pillTaken)
                }

But if I make a find... it crash

private val mPillTakenBox = ObjectBox.mBoxStore.boxFor(PillTaken::class.java)
///....
val listOfTaken= mPillTakenBox.query().equal(PillTaken_.pillId, pill.id)
            .order(PillTaken_.date, QueryBuilder.CASE_SENSITIVE ).build().find()

java.lang.IllegalStateException: ToOne object is null inside com.intecanar.ondiet.data.database.entities.PillTaken
        at io.objectbox.query.Query.nativeFind(Native Method)

[greenrobot-team]

@fllaryora Is this an Android project? Did you try to manually initialize the to-one property as suggested in https://docs.objectbox.io/relations#initialization-magic?

[fllaryora]

@greenrobot-team Yes, it is an android project.
Yes, I have read that document and tried with it and without it.

[greenrobot-team]

@fllaryora Can you please share a minimal example project so we can reproduce this?

Just to make sure, the following does not work:

@Entity
data class PillTaken (
    @Id
    var id: Long = 0L
)  {
    var pill = ToOne<Pill>(this, PillTaken_.pill)
    @JvmField
    @Transient
    @Suppress("PropertyName")
    var __boxStore: BoxStore? = null
}

Is that correct?

[fllaryora]

Hello @greenrobot-team
First, let me thank you for your time.

And Yes, Despite using your suggestion in my entity

import com.intecanar.ondiet.data.database.TimeConverterForObjectBox
import io.objectbox.BoxStore
import io.objectbox.annotation.Convert
import io.objectbox.annotation.Entity
import io.objectbox.annotation.Id
import io.objectbox.relation.ToOne
import java.time.OffsetDateTime

@Entity
data class PillTaken (
    @Id
    var id: Long = 0L,
    @Convert(converter = TimeConverterForObjectBox::class, dbType = String::class)
    val date: OffsetDateTime,
    val isTaken: Boolean = true
) : Graphable, Timelineable {
    var pill = ToOne<Pill>(this, PillTaken_.pill)
    @JvmField
    @Transient
    @Suppress("PropertyName")
    var __boxStore: BoxStore? = null
    override fun getX() = date
    override fun getY() = if(isTaken) 1.0f else 0.0f
    override fun getTime() = date
    override fun getLabel() = pill.target.name
    //override fun getLabel() = pill.target.name
    override fun ischecked() = isTaken
}

I am getting the exception
E/AndroidRuntime: FATAL EXCEPTION: pool-4-thread-1
Process: com.intecanar.ondiet, PID: 15846
java.lang.IllegalStateException: ToOne object is null inside com.intecanar.ondiet.data.database.entities.PillTaken
at io.objectbox.query.Query.nativeFind(Native Method)
at io.objectbox.query.Query$3.call(Query.java:209)
at io.objectbox.query.Query$3.call(Query.java:206)
at io.objectbox.BoxStore.callInReadTx(BoxStore.java:759)
at io.objectbox.BoxStore.callInReadTxWithRetry(BoxStore.java:704)
at io.objectbox.query.Query.callInReadTx(Query.java:293)
at io.objectbox.query.Query.find(Query.java:206)
at com.intecanar.ondiet.data.database.dao.PillTakenDAO.deleteByPill(PillTakenDAO.kt:43)
at com.intecanar.ondiet.domain.pill.FetchPillsUseCaseSync.deletePill(FetchPillsUseCaseSync.kt:23)
at com.intecanar.ondiet.domain.pill.DeletePillUseCase$deletePill$1.run(DeletePillUseCase.kt:20)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.lang.Thread.run(Thread.java:923)
I/Process: Sending signal. PID: 15846 SIG: 9

nativeFind method always fail I mean I tried different alternatives such as the use of backlinks.

Thanks in advance.
Francisco.

[fllaryora]

@greenrobot-team
Maybe you are wandering about how I store the new entity:

val pillTaken : PillTaken= PillTaken(0L, someDayAtTheMorning)
pillTaken.pill.target = it //it is a pill
val mPillTakenBox = ObjectBox.mBoxStore.boxFor(PillTaken::class.java)
mPillTakenBox.put(pillTaken)

Or /And Maybe you are wandering about how I find :

mPillTakenBox.query()
            .equal(PillTaken_.pillId, pill.id)
            .order(PillTaken_.date, QueryBuilder.CASE_SENSITIVE ).build()

Thanks.

[greenrobot-team]

ext.objectboxVersion = '2.5.1'

@fllaryora I just saw that you are using ObjectBox 2.5.1? Does this also happen with the latest version 2.9.1 or the latest preview release 2.9.2-RC4?