CODEWITHSUNDEEP
javamicroserviceshazelcast
johny.bravo
johny.bravo

Reputation: 77

HazelcastSerializationException after moving class to a different package

I am running an embedded hazelcast deployment and storing a ConcurrentMap<String, MyType>, where the type of value in the map is my custom class.

MyType

public class MyType implements Serializable {
   private MyTag tag;
   ...
}

One of its fields is an interface MyTag.

MyTag

public interface MyTag<T> {
}

And I have a class containing several enum implementations of MyTag interface:

MyTags

public class MyTags {

   public static enum Integers implements MyTag<Integer> {
      INT_TAG1,
      INT_TAG2,
      ...
   } 
  
    public static enum Strings implements MyTag<String> {
      STRING_TAG1,
      ...
   }
   
   ...
}

After moving MyTags class to a different package and redeploying one of my services (with MyType in the new package) upon attempting a get on the map, an exception is thrown:

com.hazelcast.nio.serialization.HazelcastSerializationException: java.lang.ClassNotFoundException: old.package.MyTags$Strings

How could I protect myself from this situation when deploying on a production environment?

Upvotes: 0

Views: 386

Answers (1)

Wim Deblauwe
Wim Deblauwe

Reputation: 26858

Java's Serializable depends on the class remaining the exact same. A moved class is no longer the same class. Select one of the other options that Hazelcast has for serialization of objects. See Comparing Serialization Options for some more guidance on the different options.

Upvotes: 1

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