RealmLog causes IllegalStateException

[ghost]

Steps

1. Run an asynchronous query using Realm
2. Use the RxJava API (query.asObservable)
3. Inside of a map operator, check if the RealmObject returned is loaded and is valid

Desired behavior
The boolean checks return true or false and I go about my day.

Encountered behavior
In the case of isValid being false, RealmLog attempts to write this event and calls toString() on the Realm proxy class. This causes an IllegalStateException with the message: Can't access a row that hasn't been loaded or represents 'null', make sure the instance is loaded and is valid by calling 'RealmObject.isLoaded() && RealmObject.isValid()'.

StackTrace

FATAL EXCEPTION: main Process: org.unos.transnet.release, PID: 12048 java.lang.IllegalStateException: Can't access a row that hasn't been loaded or represents 'null', make sure the instance is loaded and is valid by calling 'RealmObject.isLoaded() && RealmObject.isValid()'. at io.realm.internal.Row$1.isNullLink(Row.java:191) at io.realm.ProfileEntityRealmProxy.realmGet$user(ProfileEntityRealmProxy.java:100) at org.unos.ett.api.entity.ProfileEntity.toString(ProfileEntity.java:31) at java.util.Formatter.transform(Formatter.java:1421) at java.util.Formatter.doFormat(Formatter.java:1081) at java.util.Formatter.format(Formatter.java:1042) at java.util.Formatter.format(Formatter.java:1011) at java.lang.String.format(String.java:1554) at java.lang.String.format(String.java:1528) at io.realm.log.RealmLog.log(RealmLog.java:360) at io.realm.log.RealmLog.trace(RealmLog.java:203) at io.realm.log.RealmLog.trace(RealmLog.java:192) at io.realm.HandlerController.completedAsyncRealmObject(HandlerController.java:636) at io.realm.HandlerController.handleMessage(HandlerController.java:131) at android.os.Handler.dispatchMessage(Handler.java:98) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5417) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

Code Sample

realm.where(entityClass)
                .findFirstAsync()
                .asObservable()
                .cast(entityClass)
                .map(new Func1<Entity, Optional<Entity>>() {
            @Override
            public Optional<Entity> call(Entity entity) {
                boolean loaded = entity.load();
                if (loaded && entity.isValid()) {
                    return Optional.of(entity);
                } else {
                    return Optional.absent();
                }
            }
        })
                .first();

Version of Realm and tooling

Realm version(s): 2.1.1

Realm sync feature enabled: no

Android Studio version: 2.2.3

Which Android version and device: Android Emulator, API 23

[Zhuinden]

While this is clearly a bug, what's the point of using findFirstAsync() if you're just going to load it immediately synchronously anyways?

[ghost]

This is more a proof of concept than anything.

[cmelchior]

Well that is embarrassing. Thanks for the report.

[ghost]

Any progress on this? Still occurring.

[cmelchior]

We should fix this asap, but might want to verify if it is still happening on #3834

[ghost]

It doesn't look like there's a snapshot available for the changes you're making in #3834.

[dalinaum]

Since #3834 is still reviewing, the snapshot doesn't include it yet.

[beeender]

#3834 is merged to master. will be fixed in v2.4.0. 2.4.0-SNAPSHOT should be including it now.