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Calling the JVM from Rust via JNI

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# Rucaja (Rust calls Java) [![Build Status](https://travis-ci.org/kud1ing/rucaja.svg?branch=master)](https://travis-ci.org/kud1ing/rucaja)

Calling JVM code from Rust via JNI.

## Usage

JNI calls are about 10-20 times slower than regular JVM instructions.
It is adviced to call as few functions as possible that do as much work as possible.

Creating a flat Java wrapper class and producing a fat JAR with all the dependencies also reduces the amount of Rust interface code.

A more complete example is [kud1ing/tinkerpop-rs](https://github.com/kud1ing/tinkerpop-rs) which uses Rucaja to call [Apache TinkerPop](https://tinkerpop.apache.org).

## Platforms

The code is tested on Linux and macOS.
Your platform might need adjustments in `build.rs`.

### Mac

Trying to run may give:

dyld: Library not loaded: @rpath/libjvm.dylib
      Referenced from: ./target/debug/rucaja
      Reason: image not found
    Abort trap: 6

this might require something like:

sudo ln -s $(/usr/libexec/java_home)/jre/lib/server/libjvm.dylib /usr/local/lib

## License

Licensed under either of

* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
 * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)

at your option.

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