# GraalVM

## How to install

```bash
> sdk list java; 
> sdk install java 20.2.0.r11-grl;
> sdk use java 20.2.0.r11-grl
```

## [Simple example of mixing JS and Java](https://medium.com/graalvm/using-testcontainers-from-a-node-js-application-3aa2273bf3bb)

```bash
> git clone git@github.com:kiview/testcontainers-prod-src-example.git
> cd testcontainers-prod-src-example
> ./gradlew shadowJar
> ls build/libs/testcontainers-prod-src-example-1.0-SNAPSHOT-all.jar
```

Then create a `index.js` file for node application:

```javascript
const readline = require('readline');
var GenericContainer = Java.type('org.testcontainers.containers.GenericContainer');
var container = new GenericContainer("nginx");
container.setExposedPorts([80]);
container.start();
console.log(container.getContainerIpAddress() + ':' + container.getMappedPort(80));
const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout
});
rl.question('Type something to quit? ', (answer) => {
  console.log(`Thank you! Bye!`);
  rl.close();
});
```

Assuming the folder structure is following:

* testcontainers-prod-src-example
  * build/libs/testcontainers-prod-src-example-1.0-SNAPSHOT-all.jar
* graalvm\_example
  * index.js

How to start node with java lib as a dependency:

```bash
> $JAVA_HOME/bin/node --polyglot --jvm \
--vm.cp=../testcontainers-prod-src-example/build/libs/testcontainers-prod-src-example-1.0-SNAPSHOT-all.jar \
index.js
```

in this case `echo $JAVA_HOME` returns graalvm java.