Crash related to net.dankito.utils.AsyncProducerConsumerQueue.consumerThread

[tised]

Hello, we are experiencing weird crash in firebase crash reports, maybe you'll be able to help us because I see references to your utils class

Fatal Exception: java.lang.NullPointerException: Callable returned null at io.reactivex.internal.functions.ObjectHelper.requireNonNull(ObjectHelper.java:39) at io.reactivex.internal.operators.observable.ObservableFromCallable.subscribeActual(ObservableFromCallable.java:43) at io.reactivex.Observable.subscribe(Observable.java:12267) at io.reactivex.internal.operators.observable.ObservableSubscribeOn$SubscribeTask.run(ObservableSubscribeOn.java:96) at io.reactivex.internal.schedulers.ScheduledDirectTask.call(ScheduledDirectTask.java:38) at io.reactivex.internal.schedulers.ScheduledDirectTask.call(ScheduledDirectTask.java:26) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:301) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636) at java.lang.Thread.run(Thread.java:764)

AsyncProducerConsumerQueue0 at java.lang.Object.wait(Object.java) at java.lang.Thread.parkFor$(Thread.java:2135) at sun.misc.Unsafe.park(Unsafe.java:358) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:190) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2059) at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442) at net.dankito.utils.AsyncProducerConsumerQueue.consumerThread(AsyncProducerConsumerQueue.kt:108) at net.dankito.utils.AsyncProducerConsumerQueue$startConsumerThread$consumerThread$1.run(AsyncProducerConsumerQueue.kt:98) at java.lang.Thread.run(Thread.java:764)

[dankito]

It's a bit hard to narrow down the issue as the stack trace doesn't show the producer side.

But actually it can only be that place in JavaScriptExecutorBase.kt (fireHtmlChangedListenersQueue is of type AsyncProducerConsumerQueue):

    protected open fun fireHtmlChangedListenersAsync(html: String) {
        if (htmlChangedListeners.isNotEmpty()) {
            fireHtmlChangedListenersQueue.add(html)
        }
    }

So that would mean that editor's html somehow was null.

Still trying to figure out how this ever can happen (actually should never be the case).

Do you call RichTextEditor from Java and do you have any code in your application where you call RichTextEditor.setHtml(null) (that means do you call setHtml() with 'null' as parameter)?

[tised]

I think it's not relevant anymore so I'll close it