# wasmtime-java

**Repository Path**: mirrors_dsyer/wasmtime-java

## Basic Information

- **Project Name**: wasmtime-java
- **Description**: Java or JVM-language binding for Wasmtime
- **Primary Language**: Unknown
- **License**: Apache-2.0
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2022-02-17
- **Last Updated**: 2026-02-14

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

wasmtime-java
=============

Java (or any JVM) language binding for [Wasmtime](https://github.com/bytecodealliance/wasmtime).

Some basic examples are working, but many API implementations are work in progress.

# Declaring Dependencies

Gradle example:

```groovy
repositories {
    mavenCentral()
}

dependencies {
    implementation "io.github.kawamuray.wasmtime:wasmtime-java:$LATEST_VERSION"
}
```

An artifact (JAR) of `wasmtime-java` ships along with prebuilt JNI libraries for some major platforms, so just adding the above dependency provides you a self-contained `wasmtime` runtime on supported platforms:

| OS          | Arch   |
| ----        | ----   |
| Linux (ELF) | x86_64 |
| Mac OS      | x86_64 |
| Windows     | x86_64 |

# Example

See [examples](./examples) for the full example.

```java
public class HelloWasm {
    public static void main(String[] args) {
        try (Store store = new Store();
             Engine engine = store.engine();
             Module module = Module.fromFile(engine, "./hello.wat");
             Func helloFunc = WasmFunctions.wrap(store, () -> {
                 System.err.println(">>> Calling back...");
                 System.err.println(">>> Hello World!");
             })) {
            Collection<Extern> imports = Arrays.asList(Extern.fromFunc(helloFunc));
            try (Instance instance = new Instance(store, module, imports)) {
                try (Func f = instance.getFunc("run").get()) {
                    WasmFunctions.Consumer0 fn = WasmFunctions.consumer(f);
                    fn.accept();
                }
            }
        }
    }
}
```

Run example:
```sh
$ ./gradlew -Pmain=examples.HelloWorld examples:run
```

# How to build

```sh
$ ./gradlew build
```

# License

Apache License Version 2.0