Hazelcast: DataSerializableFactory[-2] is already registered! com.hazelcast.partition.PartitionDataSerializerHook

[ohadbehore]

I tried to run the following code:

HazelcastInstance hz = null;

    try {
        hz = Hazelcast.newHazelcastInstance();
        Address localMemberInstance = hz.getCluster().getLocalMember().getAddress();
        Set<Member> allMembers = hz.getCluster().getMembers();
        for (Member currMember : allMembers) {
            if (localMemberInstance.getHost().equals(currMember.getAddress().getHost()) && localMemberInstance.getPort() == currMember.getAddress().getPort() ) {
                CacheLogger.log(Level.ERROR, "*Local Hazelcast Server IP=" + localMemberInstance.getHost() + " , port=" + localMemberInstance.getPort() + ", ID=" + localMemberInstance.getId());
            } else {
                CacheLogger.log(Level.ERROR, "Remote Hazelcast Server IP=" + currMember.getAddress().getHost() + " , port=" + currMember.getAddress().getPort() + ", ID=" + currMember.getAddress().getId());
            }
        }

    } catch (Exception e) {
        e.printStackTrace();
    }

And I got the following exception:
INFO: Loading 'hazelcast.xml' from classpath.
java.lang.IllegalArgumentException: DataSerializableFactory[-2] is already registered! com.hazelcast.partition.PartitionDataSerializerHook$1@1a18644 -> com.hazelcast.internal.partition.impl.PartitionDataSerializerHook$1@5acf93bb
at com.hazelcast.internal.serialization.impl.DataSerializableSerializer.register(DataSerializableSerializer.java:87)
at com.hazelcast.internal.serialization.impl.DataSerializableSerializer.(DataSerializableSerializer.java:66)
at com.hazelcast.internal.serialization.impl.SerializationServiceV1.(SerializationServiceV1.java:94)
at com.hazelcast.internal.serialization.impl.DefaultSerializationServiceBuilder.createSerializationService(DefaultSerializationServiceBuilder.java:264)
at com.hazelcast.internal.serialization.impl.DefaultSerializationServiceBuilder.build(DefaultSerializationServiceBuilder.java:218)
at com.hazelcast.internal.serialization.impl.DefaultSerializationServiceBuilder.build(DefaultSerializationServiceBuilder.java:46)
at com.hazelcast.instance.DefaultNodeExtension.createSerializationService(DefaultNodeExtension.java:126)
at com.hazelcast.instance.Node.(Node.java:181)
at com.hazelcast.instance.HazelcastInstanceImpl.createNode(HazelcastInstanceImpl.java:155)
at com.hazelcast.instance.HazelcastInstanceImpl.(HazelcastInstanceImpl.java:126)
at com.hazelcast.instance.HazelcastInstanceFactory.constructHazelcastInstance(HazelcastInstanceFactory.java:218)
at com.hazelcast.instance.HazelcastInstanceFactory.newHazelcastInstance(HazelcastInstanceFactory.java:176)
at com.hazelcast.instance.HazelcastInstanceFactory.newHazelcastInstance(HazelcastInstanceFactory.java:126)
at com.hazelcast.core.Hazelcast.newHazelcastInstance(Hazelcast.java:87)
at com.unisfair.hazelcastinstance.HazelcastInstanceServerMain.main(HazelcastInstanceServerMain.java:26)

I have to mention that the exception occurred when I changed the hazelcast jar version from hazelcast 3.6 to hazelcast 3.7.

I attached the hazelcast.xml configuration file.

Does anyone have an idea what is the issue here?

hazelcast_with_issue_version_3_7.zip

[jerrinot]

Hi @ohadbehore, can you check you have just a single version of Hazelcast on your classpath?

[ohadbehore]

I'm running a simple application from eclipse. And it has only hazelcast-all-3.7.jar
There are no other versions in the classpath.

[jerrinot]

That's odd. I've seen this error a few times. It was always caused by one of these:

1. an environment with complicated classloading - such as Java EE or OSGIi container - a single Hazecast JAR is loaded by multiple classloaders
2. having multiple Hazelcast JARs.

I created a new project and used your configuration, but I could not reproduce it. I was using IntelliJ and not Eclipse, but should not play any role here. Could you prepare an example project manifesting the bug?

[ohadbehore]

The problem was that in the pom.xml (maven) relating to the project there was a reference for hazelcast version 3.6 .
Sorry I did not notice that before. You were right.

[jerrinot]

that's great to know, thanks for heads-up!