Liberty CNB

[krismarc]

I'm trying to use Liberty CNB. Details shared here:
paketo-buildpacks/liberty#1047

the start command seems to be set:
start command: server run defaultServer

However, application fails to get started:

   2025-08-01T11:09:26.12+0200 [APP/PROC/WEB/0] OUT Detected process type: "launcher", isSidecar: true
   2025-08-01T11:09:26.12+0200 [APP/PROC/WEB/0] OUT ERROR: failed launching with self: "launcher", defaultProc: "", args: []string{}, error: determine start command: when there is no default process a command is required

Is there anything that CNB needs to meet yet?

Here's config/metadata.toml:

# cat metadata.toml
buildpack-default-process-type = "open-liberty-runtime"

[[buildpacks]]
  id = "paketo-buildpacks/ca-certificates"
  version = "3.10.0"
  api = "0.7"
  homepage = "https://github.com/paketo-buildpacks/ca-certificates"

[[buildpacks]]
  id = "paketo-buildpacks/bellsoft-liberica"
  version = "11.2.0"
  api = "0.7"
  homepage = "https://github.com/paketo-buildpacks/bellsoft-liberica"

[[buildpacks]]
  id = "paketo-buildpacks/syft"
  version = "2.10.0"
  api = "0.7"
  homepage = "https://github.com/paketo-buildpacks/syft"

[[buildpacks]]
  id = "paketo-buildpacks/liberty"
  version = "5.1.0"
  api = "0.7"
  homepage = "https://github.com/paketo-buildpacks/liberty"

[[buildpacks]]
  id = "paketo-buildpacks/dist-zip"
  version = "5.10.0"
  api = "0.7"
  homepage = "https://github.com/paketo-buildpacks/dist-zip"

[[buildpacks]]
  id = "paketo-buildpacks/spring-boot"
  version = "5.33.0"
  api = "0.7"
  homepage = "https://github.com/paketo-buildpacks/spring-boot"

[[processes]]
  type = "open-liberty-runtime"
  command = ["server"]
  args = ["run", "defaultServer"]
  direct = true
  buildpack-id = "paketo-buildpacks/liberty"

[modulo11]

This should actually be fixed by fc97650. CF always expects a web process type which should be ensured by the mentioned change.

Can you check the version of https://github.com/cloudfoundry/diego-release that your infrastructure is using and if this is included?

I'm curious what the processes of your app look like. Can you quickly check?

cf curl /v3/apps/<your-app-guid>/processes
cf curl /v3/processes/<your-apps-process-guid>

With my quick test on our infrastructure I end up with a running app:

Waiting for app war-sample to start...

Instances starting...
Instances starting...
Instances starting...
Instances starting...

name:              war-sample
requested state:   started
routes:            my-app.example.com
last uploaded:     Wed 06 Aug 11:08:29 CEST 2025
stack:             cflinuxfs4
buildpacks:
	name                                       version   detect output   buildpack name
	docker://docker.io/paketobuildpacks/java

type:            web
sidecars:
instances:       1/1
memory usage:    1024M
start command:   server run defaultServer
     state     since                  cpu    memory     disk       logging        cpu entitlement   details
#0   running   2025-08-06T09:08:42Z   0.0%   0B of 0B   0B of 0B   0B/s of 0B/s   0.0%

type:            open-liberty-runtime
sidecars:
instances:       0/0
memory usage:    1024M
start command:   server run defaultServer
There are no running instances of this process.

[krismarc]

We are most likely using diego 2.117.0 at the moment - I'm not operator, however I can double check with them.

Is that expected that you have 2 processes created? The other one looks weird has 0 instances out of 0..

How it comes that only 1 buildpack is listed in your output? While I've got 2 (java and liberty).

What does Max mean in this #94 (comment) ? What should I use as a process name?.. In some documentation it was mentioned to specify run command, not a process name.

# cf app cf-liberty
Showing health and status for app cf-liberty in org MAS / space s8me5s as S8ME5S...

name:              cf-liberty
requested state:   started
routes:            cf-liberty-impressive-kudu-pc.appcloudtest-dev.company.com
last uploaded:     Wed 06 Aug 16:18:56 CEST 2025
stack:             cflinuxfs4
buildpacks:
        name                                                             version   detect output   buildpack name
        docker://gcr-io.artifact.company.com/paketo-buildpacks/java
        docker://gcr-io.artifact.company.com/paketo-buildpacks/liberty

type:           web
sidecars:
instances:      0/1
memory usage:   1024M
     state     since                  cpu    memory     disk       logging        cpu entitlement   details
#0   crashed   2025-08-06T14:29:23Z   0.0%   0B of 0B   0B of 0B   0B/s of 0B/s   0.0%

type:           open-liberty-runtime
sidecars:
instances:      0/0
memory usage:   1024M
There are no running instances of this process.

2 processes were created:

# cf curl /v3/apps/$(cf app cf-liberty --guid)/processes | jq -r '.resources[] | del(.links, .metadata)'
{
  "guid": "223bdd2d-7242-4cc7-8ae3-b2de6766480e",
  "created_at": "2025-08-06T14:16:49Z",
  "updated_at": "2025-08-06T14:19:13Z",
  "version": "4af3aff9-b53b-4a15-a8f2-81b08b6ee284",
  "type": "web",
  "command": "[PRIVATE DATA HIDDEN IN LISTS]",
  "instances": 1,
  "memory_in_mb": 1024,
  "disk_in_mb": 1024,
  "log_rate_limit_in_bytes_per_second": -1,
  "health_check": {
    "type": "port",
    "data": {
      "timeout": null,
      "invocation_timeout": null,
      "interval": null
    }
  },
  "readiness_health_check": {
    "type": "process",
    "data": {
      "invocation_timeout": null,
      "interval": null
    }
  },
  "relationships": {
    "app": {
      "data": {
        "guid": "223bdd2d-7242-4cc7-8ae3-b2de6766480e"
      }
    },
    "revision": {
      "data": {
        "guid": "4a2f9c5a-c489-4690-a83d-54e1e29eefea"
      }
    }
  }
}
{
  "guid": "d232e3de-9f03-49ad-94f0-2be0dacd0db0",
  "created_at": "2025-08-06T14:19:13Z",
  "updated_at": "2025-08-06T14:19:14Z",
  "version": "f69d362d-a91b-4c7f-bb97-7e0f50b6a6b5",
  "type": "open-liberty-runtime",
  "command": "[PRIVATE DATA HIDDEN IN LISTS]",
  "instances": 0,
  "memory_in_mb": 1024,
  "disk_in_mb": 1024,
  "log_rate_limit_in_bytes_per_second": -1,
  "health_check": {
    "type": "process",
    "data": {
      "timeout": null,
      "invocation_timeout": null,
      "interval": null
    }
  },
  "readiness_health_check": {
    "type": "process",
    "data": {
      "invocation_timeout": null,
      "interval": null
    }
  },
  "relationships": {
    "app": {
      "data": {
        "guid": "223bdd2d-7242-4cc7-8ae3-b2de6766480e"
      }
    },
    "revision": {
      "data": {
        "guid": "4a2f9c5a-c489-4690-a83d-54e1e29eefea"
      }
    }
  }
}

# cf curl /v3/processes/223bdd2d-7242-4cc7-8ae3-b2de6766480e | jq -r '. | del(.links, .metadata)'
{
  "guid": "223bdd2d-7242-4cc7-8ae3-b2de6766480e",
  "created_at": "2025-08-06T14:16:49Z",
  "updated_at": "2025-08-06T14:19:13Z",
  "version": "4af3aff9-b53b-4a15-a8f2-81b08b6ee284",
  "type": "web",
  "command": "",
  "instances": 1,
  "memory_in_mb": 1024,
  "disk_in_mb": 1024,
  "log_rate_limit_in_bytes_per_second": -1,
  "health_check": {
    "type": "port",
    "data": {
      "timeout": null,
      "invocation_timeout": null,
      "interval": null
    }
  },
  "readiness_health_check": {
    "type": "process",
    "data": {
      "invocation_timeout": null,
      "interval": null
    }
  },
  "relationships": {
    "app": {
      "data": {
        "guid": "223bdd2d-7242-4cc7-8ae3-b2de6766480e"
      }
    },
    "revision": {
      "data": {
        "guid": "4a2f9c5a-c489-4690-a83d-54e1e29eefea"
      }
    }
  }
}

# cf curl /v3/processes/d232e3de-9f03-49ad-94f0-2be0dacd0db0 | jq -r '. | del(.links, .metadata)'
{
  "guid": "d232e3de-9f03-49ad-94f0-2be0dacd0db0",
  "created_at": "2025-08-06T14:19:13Z",
  "updated_at": "2025-08-06T14:19:14Z",
  "version": "f69d362d-a91b-4c7f-bb97-7e0f50b6a6b5",
  "type": "open-liberty-runtime",
  "command": "server run defaultServer",
  "instances": 0,
  "memory_in_mb": 1024,
  "disk_in_mb": 1024,
  "log_rate_limit_in_bytes_per_second": -1,
  "health_check": {
    "type": "process",
    "data": {
      "timeout": null,
      "invocation_timeout": null,
      "interval": null
    }
  },
  "readiness_health_check": {
    "type": "process",
    "data": {
      "invocation_timeout": null,
      "interval": null
    }
  },
  "relationships": {
    "app": {
      "data": {
        "guid": "223bdd2d-7242-4cc7-8ae3-b2de6766480e"
      }
    },
    "revision": {
      "data": {
        "guid": "4a2f9c5a-c489-4690-a83d-54e1e29eefea"
      }
    }
  }
}

[modulo11]

You do not need to mention the liberty buildpack specifically as it is included in the java meta buildpack (and selected via BP_JAVA_APP_SERVER environment variable).

CF requires at least a web process. If none is there, cnbapplifecycle will create one from the metadata of the CNB build. In your case, both are identical. It might be an option to just let the liberty buildpack create a web process instead of a open-liberty-runtime process by default like most of the CNBs also do. Building a jar, e.g. a Spring app, using CNBs, will create three processes by default: web, executable-jar and test.

What Max mentions is that you can specify what the web process should do by using a procfile. In that case you'd need to specify the command:

web: server run defaultServer