Interesting idea! However, I'm hesitant to trust it, as I don't even fully trust code that was written by myself :)

This article summarizes our experience from a commercial project that runs on an in-vehicle Android system. In this project, we needed to invoke Rust code(DB) from Java(App), so we couldn't directly use the project’s source code for demonstration. Instead, we created a demo project: https://github.com/GreptimeTeam/rust-java-demo

1. I agree that using Rust doesn't necessarily mean faster performance; it simply gives you the opportunity to implement some compute-intensive modules in Rust, which is a possible approach.

2. This is a great suggestion, and we organized our project in the same way. You don’t need to use unsafe for every call. However, if you want to call JNI APIs from Rust, unsafe is required.

3. Sorry, some details were missing here. We use AsyncRegistry(Java) as an intermediary. Before initiating an async operation in Rust, we need to call Java code in advance to register a future and obtain a unique future ID. After the async execution completes, we retrieve the registered future by its ID, and then complete it or complete it exceptionally depending on the async result. You can refer to this code: https://github.com/GreptimeTeam/rust-java-demo/blob/90ffa0ba... and https://github.com/GreptimeTeam/rust-java-demo/blob/90ffa0ba...

4. This article was not generated by AI; it’s just that our official blog has a fixed template at the end. Sorry for the inconvenience.

Lessons from Mixing Rust and Java: Fast, Safe, and Practical

Deep dive into the challenges of building Kafka on top of S3