I’m making a library for MongoDB in Java. In one place I do:

myCollection.insertOne(doc).getInsertedId().getValue()

I insert a document and retrieve the id to return it to the caller. This works fine when testing the library, but when I actually incorporate it in a bigger project, the call returns:

Exception: java.lang.NullPointerException: Cannot invoke "com.mongodb.client.result.InsertOneResult.getInsertedId()" because "result" is null

I’m using mongodb-driver-sync version 5.0.1. Looking around, I see there’s another library using mongo-java-driver version 3.12.10 where indeed there is a version of insertOne() that returns void.

How can I resolve this conflict?