duchess-rs/duchess

Silky smooth Java-Rust interop

Rust

211

452 commits

updated Sep 22, 2026

See the code

README

Duchess: silky smooth Java integration

Duchess is a Rust crate that makes it easy, ergonomic, and efficient to interoperate with Java code.

TL;DR

Duchess permits you to reflect Java classes into Rust and easily invoke methods on Java objects. For example the following Java code...

Logger logger = new log.Logger();
logger.addEvent(
    Event.builder()
        .withTime(new Date())
        .withName("foo")
        .build()
);

...could be executed in Rust as follows:

let logger = log::Logger::new().execute()?;
logger
    .add_event(
        log::Event::builder()
            .with_time(java::util::Date::new())
            .with_name("foo")
            .build(),
    )
    .execute()?;

Curious to learn more?

Check out the...

Curious to get involved?

Look for issues tagged with good first issue and join the Zulip. For more information on how to develop duchess, see Contributing. You may also be able to improve test coverage.

Contributors

nikomatsakis

311 commits

rcoh

42 commits

chase-ok

35 commits

fpoli

29 commits

duchess-rs/duchess

Silky smooth Java-Rust interop

Rust

211

452 commits

updated Sep 22, 2026

See the code

README

Duchess: silky smooth Java integration

Duchess is a Rust crate that makes it easy, ergonomic, and efficient to interoperate with Java code.

TL;DR

Duchess permits you to reflect Java classes into Rust and easily invoke methods on Java objects. For example the following Java code...

Logger logger = new log.Logger();
logger.addEvent(
    Event.builder()
        .withTime(new Date())
        .withName("foo")
        .build()
);

...could be executed in Rust as follows:

let logger = log::Logger::new().execute()?;
logger
    .add_event(
        log::Event::builder()
            .with_time(java::util::Date::new())
            .with_name("foo")
            .build(),
    )
    .execute()?;

Curious to learn more?

Check out the...

Curious to get involved?

Look for issues tagged with good first issue and join the Zulip. For more information on how to develop duchess, see Contributing. You may also be able to improve test coverage.

Contributors

nikomatsakis

311 commits

rcoh

42 commits

chase-ok

35 commits

fpoli

29 commits

Languages

Rust

95.9%

Java

3.3%