Save null value with Spring repository to mongodb document

问题

I want to save a null value to a document with a Spring Data Repository.

So someEntity below is an object with a property set to null in java.

...
repository.save(someEntity);
...

Spring will save this as undefined, meaning the property of the document is not set to null. In our use case, we treat null as a proper value.

How can you solve this without overriding the save() method in the repository?

来源：https://stackoverflow.com/questions/27187749/save-null-value-with-spring-repository-to-mongodb-document