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This exception has no message.
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java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextNode(HashMap.java:1437) at java.util.HashMap$KeyIterator.next(HashMap.java:1461) at com.google.protobuf.AbstractMessageLite$Builder.checkForNullValues(AbstractMessageLite.java:379) at com.google.protobuf.AbstractMessageLite$Builder.addAll(AbstractMessageLite.java:366) at com.google.pubsub.v1.AcknowledgeRequest$Builder.addAllAckIds(AcknowledgeRequest.java:621) at com.google.pubsub.kafka.source.CloudPubSubSourceTask.ackMessages(CloudPubSubSourceTask.java:202) at com.google.pubsub.kafka.source.CloudPubSubSourceTask.poll(CloudPubSubSourceTask.java:108) at org.apache.kafka.connect.runtime.WorkerSourceTask.execute(WorkerSourceTask.java:162) at org.apache.kafka.connect.runtime.WorkerTask.doRun(WorkerTask.java:139) at org.apache.kafka.connect.runtime.WorkerTask.run(WorkerTask.java:182) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:748)