Hello,
I am running CBLite 2.8.5 on Android. I am seeing an exception being thrown on rare occasions when iterating through an Array
and attempting to filter and map it is a Dictionary
. Specifically my code is array.filterIsInstance<Dictionary>()
(from the Kotlin collections extensions in kotlin-stdlib-common
). On rare occasions I can see a stack trace like this:
java.lang.IllegalArgumentException: handle must not be 0
at com.couchbase.lite.internal.utils.Preconditions.assertNotZero(Preconditions.java:1)
at com.couchbase.lite.internal.fleece.FLDict.<init>(FLDict.java:2)
at com.couchbase.lite.internal.fleece.FLValue.asFLDict(FLValue.java:1)
at com.couchbase.lite.internal.fleece.MDict.initInSlot(MDict.java:5)
at com.couchbase.lite.internal.fleece.MDict.initInSlot(MDict.java:1)
at com.couchbase.lite.Dictionary.<init>(Dictionary.java:6)
at com.couchbase.lite.MValueDelegate.mValueToDictionary(MValueDelegate.java:8)
at com.couchbase.lite.MValueDelegate.toNative(MValueDelegate.java:5)
at com.couchbase.lite.internal.fleece.MValue.toNative(MValue.java:2)
at com.couchbase.lite.internal.fleece.MValue.asNative(MValue.java:3)
at com.couchbase.lite.Array.getValue(Array.java:1)
at com.couchbase.lite.Array$ArrayIterator.next(Array.java:1)
...
The kotlin stdlib code as my Android Studio defines it:
public inline fun <reified R> Iterable<*>.filterIsInstance(): List<@kotlin.internal.NoInfer R> {
return filterIsInstanceTo(ArrayList<R>())
}
/**
* Appends all elements that are instances of specified type parameter R to the given [destination].
*/
public inline fun <reified R, C : MutableCollection<in R>> Iterable<*>.filterIsInstanceTo(destination: C): C {
for (element in this) if (element is R) destination.add(element)
return destination
}
I cannot supply the raw JSON for this but I do not think that is the problem anyway as this problem does not happen consistently even when the underlying data in the database has not changed. I should also mention that I have only seen this happen on Android 6 devices, but I am not sure if it is due to that or some other hardware difference. Am I doing something wrong here? Are the kotlin Collection helpers not compatible with some underlying mechanism in the couchbase Array
class?
In case it is also helpful/relevant, I got the Array
instance by using a QueryBuilder.select()
call with a WHERE clause equaling a single document ID, got the query result by executing query.execute().allResults().firstOrNull()
, got the nested properties by calling result.getDictionary("DB_NAME")
(because the select query was a SelectResult.all()
), and then finally invoking dictionary.getValue("key") as? Array
to get the array.
Thank you,
Cole
13 posts - 2 participants