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Hazelcast exception when starting the server



Hazelcast exception when starting the server.

Error Messages

[6/15/17 21:16:40:511 EDT] 00000027 TcpIpConnecti I com.hazelcast.nio.tcp.TcpIpConnection [your_ip]:5703 [9f353e11664cd839a2abd71f71369ded] [3.4.1] Connection [your_host/your_ip:47901] lost. Reason: java.lang.IllegalArgumentException[Packet versions are not matching! This -> 3, Incoming -> 1]
[6/15/17 21:16:40:512 EDT] 00000027 ReadHandler W com.hazelcast.nio.tcp.ReadHandler [your_ip]:5703 [9f353e11664cd839a2abd71f71369ded] [3.4.1] hz._hzInstance_1_9f353e11664cd839a2abd71f71369ded.IO.thread-in-1 Closing socket to endpoint null, Cause:java.lang.IllegalArgumentException: Packet versions are not matching! This -> 3, Incoming -> 1
java.lang.IllegalArgumentException: Packet versions are not matching! This -> 3, Incoming -> 1
at com.hazelcast.nio.Packet.readFrom(
at com.hazelcast.nio.tcp.DefaultPacketReader.readPacket(
at com.hazelcast.nio.tcp.ReadHandler.handle(
at com.hazelcast.nio.tcp.InSelectorImpl.handleSelectionKey(
at com.hazelcast.nio.tcp.AbstractIOSelector.handleSelectionKeys(

Steps to Reproduce

Restart the Server

Root Cause

A defect or configuration issue in the operating environment

The machine is host to two independent clusters. The error should resolve itself, but may take considerable time and 'conversation' between nodes. It can be avoided using the change below.


Make the following change to the operating environment:

Specify distinct port ranges for the clusters, the range specification looks like this - you can pick any port range you like that is open. Once established at startup only one port is used to communicate.
<env name=“cluster/hazelcast/ports” value=“5701-5749” /> <-- port range for cluster 1
<env name=“cluster/hazelcast/ports” value=“5750-5799” /> <-- port range for cluster 2

Published August 26, 2017 - Updated October 8, 2020

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