Crash on loading serialized object from intent in To-Many case

hi, the issue is, I have a Receipt class with an arraylist of items. so I used ToMany relation and changed arraylist to To-Many and in ReceiptItem class created a new field with To-One relationship. Its working fine and saving in 2 tables properly.

@Entity
public class Receipt implements Serializable {
    public ToMany<ReceiptItem> receipt_items;
   .... 
}
@Entity
public class ReceiptItem implements Serializable {
    public ToOne<Receipt> receiptToOne;
}

I am sending my receipt object from one activity to another activity by serialization and getting in another activity.
receipt = (Receipt) (intent.getSerializableExtra("key_receiptobject"));

No issues and this is working fine.

Now for proper One-To-Many relationship I added, @Backlink annotation.

@Entity
public class Receipt implements Serializable {
    @Backlink
    public ToMany<ReceiptItem> receipt_items;
   .... 
}

and my app crashes on this line,
receipt = (Receipt) (intent.getSerializableExtra("key_receiptobject"));

Can you please help me to resolve this.

Issue Basics

• ObjectBox version : 1.4.0
• Reproducibility: always

Logs & stackstraces

E/UncaughtException: java.lang.RuntimeException: Unable to start activity ComponentInfo{}: java.lang.RuntimeException: Parcelable encountered ClassNotFoundException reading a Serializable object (name = abc.sales.entity.Receipt)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2429)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2493)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1357)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5459)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
Caused by: java.lang.RuntimeException: Parcelable encountered ClassNotFoundException reading a Serializable object (name = abc.sales.entity.Receipt)
at android.os.Parcel.readSerializable(Parcel.java:2512)
at android.os.Parcel.readValue(Parcel.java:2315)
at android.os.Parcel.readArrayMapInternal(Parcel.java:2614)
at android.os.BaseBundle.unparcel(BaseBundle.java:221)
at android.os.BaseBundle.getSerializable(BaseBundle.java:992)
at android.os.Bundle.getSerializable(Bundle.java:880)
at android.content.Intent.getSerializableExtra(Intent.java:5468)
at abc.sales.Activities.sale.ITPrintReceiptActivity.onCreate(ITPrintReceiptActivity.java:129)
at android.app.Activity.performCreate(Activity.java:6259)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1130)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2382)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2493) 
at android.app.ActivityThread.-wrap11(ActivityThread.java) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1357) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:148) 
at android.app.ActivityThread.main(ActivityThread.java:5459) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 
Caused by: java.lang.ClassNotFoundException: long
at java.lang.Class.classForName(Native Method)
at java.lang.Class.forName(Class.java:324)
at android.os.Parcel$2.resolveClass(Parcel.java:2498)
at java.io.ObjectInputStream.readNewClassDesc(ObjectInputStream.java:1641)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:657)
at java.io.ObjectInputStream.readNewClass(ObjectInputStream.java:1512)
at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:755)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1983)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1940)
at java.io.ObjectInputStream.readFieldValues(ObjectInputStream.java:1113)
at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:454)
at java.io.ObjectInputStream.readObjectForClass(ObjectInputStream.java:1345)
at java.io.ObjectInputStream.readHierarchy(ObjectInputStream.java:1242)
at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:1835)
at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:761)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1983)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1940)
at java.io.ObjectInputStream.readFieldValues(ObjectInputStream.java:1113)
at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:454)
at java.io.ObjectInputStream.readObjectForClass(ObjectInputStream.java:1345)
at java.io.ObjectInputStream.readHierarchy(ObjectInputStream.java:1242)
at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:1835)
at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:761)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1983)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1940)
at java.io.ObjectInputStream.readFieldValues(ObjectInputStream.java:1113)
at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:454)
at java.io.ObjectInputStream.readObjectForClass(ObjectInputStream.java:1345)
at java.io.ObjectInputStream.readHierarchy(ObjectInputStream.java:1242)
at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:1835)
at java.io.Obje
01-19 22:58:22.752 7470-7488/abc.sales D/FA: Logging event (FE): _ae, Bundle[{_o=crash, timestamp=1516382902748, fatal=1}]
01-19 22:58:23.008 7470-7470/abc.sales E/AndroidRuntime: FATAL EXCEPTION: main
Process: abc.sales, PID: 7470
java.lang.RuntimeException: Unable to start activity ComponentInfo{abc.sales/abc.sales.Activities.sale.ITPrintReceiptActivity}: java.lang.RuntimeException: Parcelable encountered ClassNotFoundException reading a Serializable object (name = abc.sales.entity.Receipt)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2429)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2493)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1357)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5459)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
Caused by: java.lang.RuntimeException: Parcelable encountered ClassNotFoundException reading a Serializable object (name = abc.sales.entity.Receipt)
at android.os.Parcel.readSerializable(Parcel.java:2512)
at android.os.Parcel.readValue(Parcel.java:2315)
at android.os.Parcel.readArrayMapInternal(Parcel.java:2614)
at android.os.BaseBundle.unparcel(BaseBundle.java:221)
at android.os.BaseBundle.getSerializable(BaseBundle.java:992)
at android.os.Bundle.getSerializable(Bundle.java:880)
at android.content.Intent.getSerializableExtra(Intent.java:5468)
at abc.sales.Activities.sale.ITPrintReceiptActivity.onCreate(ITPrintReceiptActivity.java:129)
at android.app.Activity.performCreate(Activity.java:6259)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1130)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2382)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2493) 
at android.app.ActivityThread.-wrap11(ActivityThread.java) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1357) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:148) 
at android.app.ActivityThread.main(ActivityThread.java:5459) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 
Caused by: java.lang.ClassNotFoundException: long
at java.lang.Class.classForName(Native Method)
at java.lang.Class.forName(Class.java:324)
at android.os.Parcel$2.resolveClass(Parcel.java:2498)
at java.io.ObjectInputStream.readNewClassDesc(ObjectInputStream.java:1641)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:657)
at java.io.ObjectInputStream.readNewClass(ObjectInputStream.java:1512)
at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:755)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1983)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1940)
at java.io.ObjectInputStream.readFieldValues(ObjectInputStream.java:1113)
at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:454)
at java.io.ObjectInputStream.readObjectForClass(ObjectInputStream.java:1345)
at java.io.ObjectInputStream.readHierarchy(ObjectInputStream.java:1242)
at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:1835)
at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:761)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1983)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1940)
at java.io.ObjectInputStream.readFieldValues(ObjectInputStream.java:1113)
at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:454)
at java.io.ObjectInputStream.readObjectForClass(ObjectInputStream.java:1345)
at java.io.ObjectInputStream.readHierarchy(ObjectInputStream.java:1242)
at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:1835)
at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:761)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1983)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1940)
at java.io.ObjectInputStream.readFieldValues(ObjectInputStream.java:1113)
at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:454)
at java.io.ObjectInputStream.readObjectForClass(ObjectInputStream.java:1345)
at java.io.ObjectInputStream.readHierarchy(ObjectInputStream.java:1242)
at java.io.ObjectInputStream.readN

Bắt đầu từ ITPrintReceiptActivity.java:129 và kiểm tra các khai báo Receipt và ReceiptItem được nêu trong issue, so sánh quá trình tuần tự hóa trước và sau khi thêm @Backlink. Tái hiện lỗi giải tuần tự hóa Intent với ObjectBox 1.4.0 và stack trace được cung cấp. Hoàn thành khi activity có thể tải Receipt đã được tuần tự hóa với quan hệ hiện diện mà không gặp ClassNotFoundException.