nats.java: ArrayIndexOutOfBoundsException on attempt to reconnect

Defect

We observed one of our Nats clients in our production enviroment flooded log with the following exceptions.

1. First 40 minutes it was throwing the following exception during publish() call (messages consumption was healthy):

java.lang.IllegalStateException: Output queue is full 5000
	at io.nats.client.impl.MessageQueue.push(MessageQueue.java:124)
	at io.nats.client.impl.MessageQueue.push(MessageQueue.java:110)
	at io.nats.client.impl.NatsConnectionWriter.queue(NatsConnectionWriter.java:209)
	at io.nats.client.impl.NatsConnection.queueOutgoing(NatsConnection.java:1353)
	at io.nats.client.impl.NatsConnection.publishInternal(NatsConnection.java:765)
	at io.nats.client.impl.NatsConnection.publish(NatsConnection.java:733)

1. Then both publishing and consumption didn’t work for another 40 minutes till service was terminated. At this time log was flooded with the following exceptions (each time with the same last destination index and byte index):

java.util.concurrent.ExecutionException: java.lang.ArrayIndexOutOfBoundsException: arraycopy: last destination index 175759 out of bounds for byte[131555]
	at java.base/java.util.concurrent.FutureTask.report(FutureTask.java:122)
	at java.base/java.util.concurrent.FutureTask.get(FutureTask.java:205)
	at io.nats.client.impl.NatsConnection.tryToConnect(NatsConnection.java:380)
	at io.nats.client.impl.NatsConnection.reconnect(NatsConnection.java:254)
	at io.nats.client.impl.NatsConnection.closeSocket(NatsConnection.java:583)
	at io.nats.client.impl.NatsConnection.lambda$handleCommunicationIssue$3(NatsConnection.java:541)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.ArrayIndexOutOfBoundsException: arraycopy: last destination index 175759 out of bounds for byte[131555]
	at java.base/java.lang.System.arraycopy(Native Method)
	at io.nats.client.impl.NatsConnectionWriter.sendMessageBatch(NatsConnectionWriter.java:147)
	at io.nats.client.impl.NatsConnectionWriter.run(NatsConnectionWriter.java:188)
	... 5 common frames omitted

Our client configuration:

        Options options = new Options.Builder()
                .servers(natsBootstrapServers.addresses)
                .errorListener(errorListener)
                .connectionTimeout(Duration.ofSeconds(5))
                .maxReconnects(-1) // -1 = Infinite
                .connectionName(getHostName())
                .pingInterval(Duration.ofSeconds(2))
                .build();

We don’t have a reproduction scenario yet.

Versions of io.nats:jnats and nats-server:

nats server v 2.7.4 jnats v 2.14.1

OS/Container environment:

adoptopenjdk/openjdk11:jdk-11.0.8_10-alpine

Steps or code to reproduce the issue:

Expected result:

Actual result: