Re: Dealing with Not Serializable classes in Java

Posted by Chesnay Schepler on
URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/Dealing-with-Not-Serializable-classes-in-Java-tp22576p22591.html

The null check in the method is the general-purpose way of solving it.
If the ObjectMapper is thread-safe you could also initialize it as a static field.

On 26.08.2018 17:58, Dominik Wosiński wrote:

Hey, 

I was wondering how do You normally deal with fields that contain references that are not serializable. Say, we have a custom serialization schema in Java that needs to serialize LocalDateTime field with ObjectMapper.  This requires registering specific module for ObjectMapper and this makes it not serializable (module contains some references to classes that are not serializable). 
Now, if You would initialize ObjectMapper directly in the field this will cause an exception when deploying the job. 

Normally I would do : 

@Override
public byte[] serialize(Backup backupMessage) {
    if(objectMapper == null) {
        objectMapper = new ObjectMapper().registerModule(new JavaTimeModule());
    }
...
}

But I was wondering whether do You have any prettier option of doing this? 

Thanks,
Dominik.