Struggling with Java

Prerequisites

https://docs.docker.com/desktop/dev-environments/create-dev-env/#prerequisites

You need:

Docker Desktop
Git
VSCode
Visual Studio Code Remote Containers Extension

Getting started

First, clone this project.

👋 you need to specify the architecture of the host machine: if needed, change the value of the WORKSPACE_ARCH variable in this file: compose-dev.yaml (for example, if you work on a Macbook Intel, use amd64, on a Macbook M1, use arm64 - it's the same with Linux - not yet tested on Windows)

Then:

Open Docker Desktop
Go to the Dev Environments option menu
Click on the Create button, then on the Get Started button
Choose Local directory as the source
Select the directory of this cloned repository
Click on the Continue button, and wait for a moment
Once the build finished, Click on the Continue button
🎉 and now, you can open your new Dev Environment in VSCode

Or you can test it like this: 🌍 Open the ARM version of this Dev Environment directly from GitLab

Setup the project

Get and build Chicory

git clone https://github.com/dylibso/chicory
cd chicory
mvn clean install

Create a Java application

Generate a project

mvn archetype:generate -DgroupId=garden.bots.app -DartifactId=hello -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false

Download the wasm file

cd hello
curl https://raw.githubusercontent.com/dylibso/chicory/main/runtime/src/test/resources/wasm/iterfact.wat.wasm > factorial.wasm

Update pom.xml

<dependency>
  <groupId>com.dylibso.chicory</groupId>
  <artifactId>runtime</artifactId>
  <version>1.0-SNAPSHOT</version>
</dependency>

and:

<build>  
    <plugins>  
        <plugin>  
            <!-- Build an executable JAR -->  
            <groupId>org.apache.maven.plugins</groupId>  
            <artifactId>maven-jar-plugin</artifactId>  
            <version>3.1.0</version>  
            <configuration>  
                <archive>  
                    <manifest>  
                        <mainClass>garden.bots.app.App</mainClass>  
                    </manifest>  
                </archive>  
            </configuration>  
        </plugin>  
    </plugins>  
</build>

Update App.java

package garden.bots.app;

import com.dylibso.chicory.wasm.types.Value;

import java.io.File;

import com.dylibso.chicory.runtime.*;
import com.dylibso.chicory.runtime.Module;

public class App 
{
    public static void main( String[] args )
    {
        System.out.println( "Hello World!" );
        File wasmFile = new File("../factorial.wasm");
        Module module = Module.build(wasmFile);
        Instance instance = module.instantiate();

        ExportFunction iterFact = instance.getExport("iterFact");
        Value result = iterFact.apply(Value.i32(5))[0];
        
        System.out.println(result.asInt());

    }
}

Build and run

this works

mvn package
java -jar target/hello-1.0-SNAPSHOT.jar