Java / JVM / Spring Boot / Spring Framework

V

Voodoo262•6/26/25, 11:47 PM

Anyone have any luck with JVM / Spring Boot? I was able to get a couple requests to flow through, but most of the requests fail with the following error message:

Failed to start container: The container is not listening in the TCP address 10.0.0.1:5000

Failed to start container: The container is not listening in the TCP address 10.0.0.1:5000

Failed to start container: The container is not listening in the TCP address 10.0.0.1:5000

Failed to start container: The container is not listening in the TCP address 10.0.0.1:5000

To simplify things, I'm just running a single

standard

standard

standard

standard instance.

Just a hunch, but it feels like I'm running into some sort of timeout where Spring Boot takes too long to start listening for requests and by the time it does, Cloudflare has already marked the container instance for deletion.

I'll keep playing with it and post any revelations I have here.

V

Voodoo262•6/26/25, 11:49 PM

Proof of Spring Boot responding to a request for inspiration

V

Voodoo262•6/26/25, 11:59 PM

Some general notes on the approach I'm using:

I'm publishing the container image to the Cloudflare container registry separately from the worker. This was surprisingly easy to set up. I was already using GitHub Actions to build and publish the Docker image to AWS ECR, so all I had to do was add the following step to my CI/CD:

    - name: Build and push Docker image to Cloudflare Registry
      uses: cloudflare/wrangler-action@v3
      with:
        apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
        wranglerVersion: 4
        workingDirectory: build/dist/temp/
        command: containers build -p -t labelzoom-api-spring:${{needs.set-version.outputs.release_version}} .

    - name: Build and push Docker image to Cloudflare Registry
      uses: cloudflare/wrangler-action@v3
      with:
        apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
        wranglerVersion: 4
        workingDirectory: build/dist/temp/
        command: containers build -p -t labelzoom-api-spring:${{needs.set-version.outputs.release_version}} .

    - name: Build and push Docker image to Cloudflare Registry
      uses: cloudflare/wrangler-action@v3
      with:
        apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
        wranglerVersion: 4
        workingDirectory: build/dist/temp/
        command: containers build -p -t labelzoom-api-spring:${{needs.set-version.outputs.release_version}} .

    - name: Build and push Docker image to Cloudflare Registry
      uses: cloudflare/wrangler-action@v3
      with:
        apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
        wranglerVersion: 4
        workingDirectory: build/dist/temp/
        command: containers build -p -t labelzoom-api-spring:${{needs.set-version.outputs.release_version}} .

Then, I'm able to link my Worker to the container image by specifying the Cloudflare registry URL:

"containers": [
    {
        "class_name": "LzApiContainer",
        "image": "registry.cloudflare.com/<redacted>/labelzoom-api-spring:2.8.52",
        "max_instances": 10,
        "name": "labelzoom-api-spring",
        "instance_type": "standard",
    }
],

"containers": [
    {
        "class_name": "LzApiContainer",
        "image": "registry.cloudflare.com/<redacted>/labelzoom-api-spring:2.8.52",
        "max_instances": 10,
        "name": "labelzoom-api-spring",
        "instance_type": "standard",
    }
],

"containers": [
    {
        "class_name": "LzApiContainer",
        "image": "registry.cloudflare.com/<redacted>/labelzoom-api-spring:2.8.52",
        "max_instances": 10,
        "name": "labelzoom-api-spring",
        "instance_type": "standard",
    }
],

"containers": [
    {
        "class_name": "LzApiContainer",
        "image": "registry.cloudflare.com/<redacted>/labelzoom-api-spring:2.8.52",
        "max_instances": 10,
        "name": "labelzoom-api-spring",
        "instance_type": "standard",
    }
],

Finally, I set up a NotFound handler in Hono to route all requests to the container:

// Route all unrecognized requests to container
app.notFound(async (c) => {
  // const container = await getRandom(c.env.LZ_API_CONTAINER, LOAD_BALANCER_COUNT);
  const container = await getContainer(c.env.LZ_API_CONTAINER);
  return await container.fetch(c.req.raw);
});

// Route all unrecognized requests to container
app.notFound(async (c) => {
  // const container = await getRandom(c.env.LZ_API_CONTAINER, LOAD_BALANCER_COUNT);
  const container = await getContainer(c.env.LZ_API_CONTAINER);
  return await container.fetch(c.req.raw);
});

// Route all unrecognized requests to container
app.notFound(async (c) => {
  // const container = await getRandom(c.env.LZ_API_CONTAINER, LOAD_BALANCER_COUNT);
  const container = await getContainer(c.env.LZ_API_CONTAINER);
  return await container.fetch(c.req.raw);
});

// Route all unrecognized requests to container
app.notFound(async (c) => {
  // const container = await getRandom(c.env.LZ_API_CONTAINER, LOAD_BALANCER_COUNT);
  const container = await getContainer(c.env.LZ_API_CONTAINER);
  return await container.fetch(c.req.raw);
});

S

satish•10/26/25, 1:38 PM

@Voodoo262 : any luck getting jvm /spring boot containers work?

Java / JVM / Spring Boot / Spring Framework

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