Parent/Child Serialization local class incompatible Exception

Question

I'm getting a serialization compatibility error from the below two classes. Only the parent class, CommericalCustomer implements serialization. What is the proper way to use the Serializable Interface when having a parent/child relation as I have below?

public class CachedCommercialCustomers extends CommercialCustomer { } public class CommercialCustomer implements Serializable { private static final long serialVersionUID = 1L; }

Exception:

[#|2013-01-02T05:01:02.553-0800|SEVERE|glassfish3.1.2|com.hazelcast.nio.AbstractSerializer|_ThreadID=10;_ThreadName=Thread-2;|spot.api.model.vo.backoffice.CachedCommercialCustomers; local class incompatible: stream classdesc serialVersionUID = -2672531984245897526, local class serialVersionUID = -743225273062282831 java.io.InvalidClassException: com.sample.CachedCommercialCustomers; local class incompatible: stream classdesc serialVersionUID = -2672531984245897526, local class serialVersionUID = -743225273062282831 at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:579) at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1600) at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1513) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1749) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1346) at java.io.ObjectInputStream.readUnshared(ObjectInputStream.java:458) at com.hazelcast.nio.DefaultSerializer$ObjectSerializer.readNormal(DefaultSerializer.java:383) at com.hazelcast.nio.DefaultSerializer$ObjectSerializer.read(DefaultSerializer.java:353) at com.hazelcast.nio.DefaultSerializer.read(DefaultSerializer.java:134) at com.hazelcast.nio.CustomSerializerAdapter.read(CustomSerializerAdapter.java:33) at com.hazelcast.nio.AbstractSerializer.toObject(AbstractSerializer.java:116) at com.hazelcast.nio.AbstractSerializer.toObject(AbstractSerializer.java:146) at com.hazelcast.nio.Serializer.readObject(Serializer.java:72) at com.hazelcast.impl.ThreadContext.toObject(ThreadContext.java:103) at com.hazelcast.nio.IOUtil.toObject(IOUtil.java:149) at com.hazelcast.impl.BaseManager$RequestBasedCall.getResultAsObject(BaseManager.java:384) at com.hazelcast.impl.BaseManager$ResponseQueueCall.getResultAsObject(BaseManager.java:455) at com.hazelcast.impl.BaseManager$RequestBasedCall.getResultAsObject(BaseManager.java:368) at com.hazelcast.impl.BaseManager$ResponseQueueCall.getResultAsObject(BaseManager.java:455)

Well it looks like the problem is that your CachedCommercialCustomers class has changed since you serialized the value. Personally I'd avoid Java's default binary serialization entirely... — Jon Skeet
– Jon Skeet, Commented Jan 2, 2013 at 21:19
add private static final long serialVersionUID = -2672531984245897526L; to CachedCommercialCustomers see what happens. — BevynQ
– BevynQ, Commented Jan 2, 2013 at 21:31
@BevynQ - I get a java.io.InvalidClassException: local class incompatible: stream classdesc serialVersionUID = -743225273062282831, local class serialVersionUID = -2672531984245897526 — c12
– c12, Commented Jan 2, 2013 at 21:42
@c 12 - probably where is hazelcast reading things from if it is a database or something like that you will need to remove the objects from it. — BevynQ
– BevynQ, Commented Jan 3, 2013 at 19:34

Community · Accepted Answer · 2017-05-23 12:27:41Z

The problem here is that you don't specify a serialVersionId for your sub class - so java will generate one for you instead. A simple recompilation might change this value if you change the java source file. See the spec.

The fact that the I'd changes when the code changes is a good thing, but in some cases it will cause you some grief :)

See here for more information and how to "fix" the problem if necessary.

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