Question 1

How do I connect to MongoDB using the Java driver?

Accepted Answer

Use MongoClients.create() with a connection string and include the mongodb-driver-sync dependency. Configure settings like connection pooling via MongoClientSettings for optimal performance.

Question 2

MongoDB Java driver vs Spring Data MongoDB: which one should I choose?

Accepted Answer

Choose the official driver for low-level control and direct MongoDB access; Spring Data MongoDB is better for Spring Boot integration and ORM-like abstractions. The driver is more performant for complex, custom queries.

Question 3

How to use transactions with the MongoDB Java driver?

Accepted Answer

Start a client session with startSession(), then use startTransaction() on the session. Commit or abort as needed, ensuring your deployment is a replica set or sharded cluster for transaction support.

Question 4

Does the MongoDB Java driver support reactive programming?

Accepted Answer

Yes, via the mongodb-driver-reactive dependency for async operations with reactive streams. The Kotlin driver also offers coroutine support for idiomatic asynchronous code.

Question 5

What are common performance issues with the MongoDB Java driver?

Accepted Answer

Poor performance often stems from inadequate connection pooling, lack of indexing, or frequent client creation. Optimize by tuning MongoClientSettings and using batch operations for bulk data.

Question 6

How to handle connection errors and retries in the driver?

Accepted Answer

Implement retry logic using MongoException and enable retryable writes in MongoClientSettings. The driver provides built-in mechanisms for network timeouts, but custom backoff strategies may be needed for resilience.

driver-kotlin-coroutine

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