GraalWasm

A high-performance embeddable WebAssembly runtime for Java

Benefits

interoperability icon

Wasm for Java

Load and use WebAssembly modules and functions directly in Java
compatibility icon

WebAssembly 1.0 Support

Full WebAssembly 1.0 compatibility and WASI feature extensions
high performance icon

Fastest Wasm on the JVM

Graal JIT compiles WebAssembly for native code speed
integration icon

JavaScript integration

Simplifies use of WebAssembly modules with JavaScript wrappers
pure java icon

100% Java

Written in pure Java with zero native dependencies

How to Get Started

1. Add GraalWasm as a dependency from Maven Central


  <dependency>
    <groupId>org.graalvm.polyglot</groupId>
    <artifactId>polyglot</artifactId> 
    <version>24.1.0</version>
  </dependency>
  <dependency>
    <groupId>org.graalvm.polyglot</groupId>
    <artifactId>wasm</artifactId> 
    <version>24.1.0</version>
    <type>pom</type>
  </dependency>
  

or


  implementation("org.graalvm.polyglot:polyglot:24.1.0")
  implementation("org.graalvm.polyglot:wasm:24.1.0")
    

2. Create a WebAssembly module, for example with wat2wasm


  (module
    (func (export "addTwo") (param i32 i32) (result i32)
      local.get 0
      local.get 1
      i32.add))

3. Embed the WebAssembly module in Java


  import java.net.URL;

  import org.graalvm.polyglot.Context;
  import org.graalvm.polyglot.Source;
  import org.graalvm.polyglot.Value;

  try (Context context = Context.create()) {
      URL wasmFile = Main.class.getResource("add-two.wasm");
      String moduleName = "main";
      context.eval(Source.newBuilder("wasm", wasmFile).name(moduleName).build());
      Value addTwo = context.getBindings("wasm").getMember(moduleName).getMember("addTwo");
      System.out.println("addTwo(40, 2) = " + addTwo.execute(40, 2));
  }
                

GraalWasm Quick Start

Jump right in with this starter project

Connect with us