Java command's result does not resolve the exit code

[tisAliG]

Hello!

I am running Node.js on my backend, but I also need to run a Java command. I am unable to install both Node.js and Java, which is where this module comes in. When I attempt to wait for the results, including the success exit code, the exit code is null, and I am unable to proceed to the next step.

I need to run the a11yPDFGenerator on an HTML file that is passed to my backend. Once a11yPDFGenerator is complete, it creates a PDF file in the location I have passed, which does work using const result = await runner.runJar('pdf/a11yPDFGenerator-1.0.0.jar', [${tmpFilePath}.html, ${tmpFilePath}.pdf]), but when I attempt to check for the success exit code from my result, it comes back as null.

How can I properly wait for the Java command to complete so I can proceed to the next step in my process?

Code for reference:

const runner = create({
    debug: true,
    jreMajor: 17,
    workdir: 'pdf/runtime'
});
 
const filename = `report_${date}`;
const tmpFilePath = `pdf/tmp/${filename}`;

await writeFile(`${tmpFilePath}.html`, req.body.html);

await runner.init({
    workdir: 'pdf/runtime',
    minimumVersion: 17
});

console.log('🚀 Starting JAR with basic listener...\n');

// Run JAR with listener for real-time logging
const result = await runner.runJar('pdf/a11yPDFGenerator-1.0.0.jar', [`${tmpFilePath}.html`, `${tmpFilePath}.pdf`], {
    onStdout: (data) => {
        console.log(`📤 STDOUT: ${data.trim()}`);
     },
     onStderr: (data) => {
          console.log(`⚠️ STDERR: ${data.trim()}`);
      }
});

console.log(`\n✅ Execution completed - Exit code: ${result.exitCode}`); // exitCode is null

if (result.exitCode === 0) {
    // How do I get this to run? 
    console.log('exit code is 0');
}

Here is the output:

[NodeJavaRunner] Using cached JRE at pdf/runtime/jre-17-mac-aarch64
🚀 Starting JAR with basic listener...

[NodeJavaRunner] Running JAR: pdf/a11yPDFGenerator-1.0.0.jar with Java: pdf/runtime/jre-17-mac-aarch64/jdk-17.0.19+10-jre/Contents/Home/bin/java

✅ Execution completed - Exit code: null
📤 STDOUT & ⚠️ STDERR  // normal output from a11yPDFGenerator
📤 STDOUT: ✅ Generated accessible PDF: pdf/tmp/report_1782761978851.pdf  // normal output from a11yPDFGenerator