Can not create Java functions

[dheerajjoshim]

Is this a BUG REPORT or FEATURE REQUEST?:
BUG REPORT

What happened:
Creating Java function will make function as NOT_READY and pod is marked as Init:CrashLoopBackOff

What you expected to happen:
Function should have been created successfully

How to reproduce it (as minimally and precisely as possible):
Create Java file. Hello.java

package io.kubeless;

import io.kubeless.Event;
import io.kubeless.Context;

import java.lang.RuntimeException;

public class Hello {
    public String hello(Event event, Context context) {
        return "Hello world!";
    }
}

Add pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <artifactId>function</artifactId>
  <name>function</name>
  <version>1.0-SNAPSHOT</version>
  <dependencies>
    <dependency>
      <groupId>io.kubeless</groupId>
      <artifactId>params</artifactId>
      <version>1.0-SNAPSHOT</version>
    </dependency>
  </dependencies>
  <parent>
    <groupId>io.kubeless</groupId>
    <artifactId>kubeless</artifactId>
    <version>1.0-SNAPSHOT</version>
  </parent>
</project>

Deploy function

kubeless function deploy hello-java -f Hello.java -d pom.xml --handler Hello.hello -r java1.8
�[36mINFO�[0m[0000] Deploying function...
�[36mINFO�[0m[0000] Function hello-java submitted for deployment
�[36mINFO�[0m[0000] Check the deployment status executing 'kubeless function ls hello-java'

Kubeless function list

kubeless function ls
NAME            NAMESPACE       HANDLER         RUNTIME         DEPENDENCIES                                            STATUS
hello           default         hello.world     python2.7                                                               1/1 READY
hello-java      default         Hello.hello     java1.8         <project xmlns="http://maven.apache.org/POM/4.0.0"      0/1 NOT READY
                                                                xmlns:xsi="http://www.w3.org/2001/XMLSchema-ins...
                                                                xsi:schemaLocation="http://maven.apache.org/POM...
                                                                http://maven.apache.org/xsd/maven-4.0.0.xsd">
                                                                  <modelVersion>4.0.0</modelVersion>
                                                                  <artifactId>function</artifactId>
                                                                  <name>function</name>
                                                                  <version>1.0-SNAPSHOT</version>
                                                                  <dependencies>
                                                                    <dependency>
                                                                      <groupId>io.kubeless</groupId>
                                                                      <artifactId>params</artifactId>
                                                                      <version>1.0-SNAPSHOT</version>
                                                                    </dependency>
                                                                  </dependencies>
                                                                  <parent>
                                                                    <groupId>io.kubeless</groupId>
                                                                    <artifactId>kubeless</artifactId>
                                                                    <version>1.0-SNAPSHOT</version>
                                                                  </parent>
                                                                </project>
nodejs          default         node.less       nodejs8                                                                 1/1 READY

Pod status

NAME                                                READY     STATUS                  RESTARTS   AGE
hello-94657547f-4th28                               1/1       Running                 0          1h
hello-java-57c87d8cd-s9l65                          0/1       Init:CrashLoopBackOff   3          1m
nodejs-798475b6cf-g6k4h                             1/1       Running                 0          38m

Pod description

kubectl.exe describe pods hello-java-57c87d8cd-s9l65
Name:           hello-java-57c87d8cd-s9l65
Namespace:      default
Node:           docker-for-desktop/192.168.65.3
Start Time:     Tue, 27 Nov 2018 13:36:45 +0530
Labels:         created-by=kubeless
                function=hello-java
                pod-template-hash=137438478
Annotations:    prometheus.io/path=/metrics
                prometheus.io/port=8080
                prometheus.io/scrape=true
Status:         Pending
IP:             10.1.16.188
Controlled By:  ReplicaSet/hello-java-57c87d8cd
Init Containers:
  prepare:
    Container ID:  docker://348af8d0208fb87aeabdc962da9fa1c3b225b0a84ee5933c3a9f7e0c9fd91503
    Image:         kubeless/unzip@sha256:f162c062973cca05459834de6ed14c039d45df8cdb76097f50b028a1621b3697
    Image ID:      docker-pullable://kubeless/unzip@sha256:f162c062973cca05459834de6ed14c039d45df8cdb76097f50b028a1621b3697
    Port:          <none>
    Host Port:     <none>
    Command:
      sh
      -c
    Args:
      echo '73cae57c53af18d70df64876eda1d4efd7b14e490fecbbf50851ad930bfc9b49  /src/Hello.java' > /tmp/func.sha256 && sha256sum -c /tmp/func.sha256 && cp /src/Hello.java /kubeless/Hello.java && cp /src/pom.xml /kubeless
    State:          Terminated
      Reason:       Completed
      Exit Code:    0
      Started:      Tue, 27 Nov 2018 13:36:47 +0530
      Finished:     Tue, 27 Nov 2018 13:36:47 +0530
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /kubeless from hello-java (rw)
      /src from hello-java-deps (rw)
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-l2t6z (ro)
  compile:
    Container ID:  docker://e6281ba7ec3c188b56ea31ffa0234e8b35096d32e5e530ef9c586e243d894cf5
    Image:         kubeless/java-init@sha256:a14d846bfe53f359f706a260b95f0a9a755883b053dbd17b724e7a3cdff5bae6
    Image ID:      docker-pullable://kubeless/java-init@sha256:a14d846bfe53f359f706a260b95f0a9a755883b053dbd17b724e7a3cdff5bae6
    Port:          <none>
    Host Port:     <none>
    Command:
      sh
      -c
    Args:
      /compile-function.sh
    State:       Waiting
      Reason:    CrashLoopBackOff
    Last State:  Terminated
      Reason:    Error
      Message:   [INFO] Scanning for projects...
[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[ERROR] Child module /kubeless/function/params of /kubeless/function/pom.xml does not exist @
[ERROR] Child module /kubeless/function/function of /kubeless/function/pom.xml does not exist @
[ERROR] Child module /kubeless/function/handler of /kubeless/function/pom.xml does not exist @
 @
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]
[ERROR]   The project io.kubeless:kubeless:1.0-SNAPSHOT (/kubeless/function/pom.xml) has 3 errors
[ERROR]     Child module /kubeless/function/params of /kubeless/function/pom.xml does not exist
[ERROR]     Child module /kubeless/function/function of /kubeless/function/pom.xml does not exist
[ERROR]     Child module /kubeless/function/handler of /kubeless/function/pom.xml does not exist
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/ProjectBuildingException

      Exit Code:    1
      Started:      Tue, 27 Nov 2018 13:40:09 +0530
      Finished:     Tue, 27 Nov 2018 13:40:11 +0530
    Ready:          False
    Restart Count:  5
    Environment:
      KUBELESS_INSTALL_VOLUME:  /kubeless
      KUBELESS_FUNC_NAME:       hello
    Mounts:
      /kubeless from hello-java (rw)
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-l2t6z (ro)
Containers:
  hello-java:
    Container ID:
    Image:          kubeless/java@sha256:d2a59e50e8181174ad3c6096cd5d3ce82f46b7e22a6f3a109b0816787e7190d9
    Image ID:
    Port:           8080/TCP
    Host Port:      0/TCP
    State:          Waiting
      Reason:       PodInitializing
    Ready:          False
    Restart Count:  0
    Liveness:       http-get http://:8080/healthz delay=3s timeout=1s period=30s #success=1 #failure=3
    Environment:
      FUNC_HANDLER:             hello
      MOD_NAME:                 Hello
      FUNC_TIMEOUT:             180
      FUNC_RUNTIME:             java1.8
      FUNC_MEMORY_LIMIT:        0
      FUNC_PORT:                8080
      KUBELESS_INSTALL_VOLUME:  /kubeless
    Mounts:
      /kubeless from hello-java (rw)
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-l2t6z (ro)
Conditions:
  Type           Status
  Initialized    False
  Ready          False
  PodScheduled   True
Volumes:
  hello-java:
    Type:    EmptyDir (a temporary directory that shares a pod's lifetime)
    Medium:
  hello-java-deps:
    Type:      ConfigMap (a volume populated by a ConfigMap)
    Name:      hello-java
    Optional:  false
  default-token-l2t6z:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-l2t6z
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:
  Type     Reason                 Age              From                         Message
  ----     ------                 ----             ----                         -------
  Normal   Scheduled              4m               default-scheduler            Successfully assigned hello-java-57c87d8cd-s9l65 to docker-for-desktop
  Normal   SuccessfulMountVolume  4m               kubelet, docker-for-desktop  MountVolume.SetUp succeeded for volume "hello-java"
  Normal   SuccessfulMountVolume  4m               kubelet, docker-for-desktop  MountVolume.SetUp succeeded for volume "default-token-l2t6z"
  Normal   SuccessfulMountVolume  4m               kubelet, docker-for-desktop  MountVolume.SetUp succeeded for volume "hello-java-deps"
  Normal   Pulled                 4m               kubelet, docker-for-desktop  Container image "kubeless/unzip@sha256:f162c062973cca05459834de6ed14c039d45df8cdb76097f50b028a1621b3697" already present on machine
  Normal   Created                4m               kubelet, docker-for-desktop  Created container
  Normal   Started                4m               kubelet, docker-for-desktop  Started container
  Normal   Created                2m (x4 over 4m)  kubelet, docker-for-desktop  Created container
  Normal   Started                2m (x4 over 4m)  kubelet, docker-for-desktop  Started container
  Warning  BackOff                2m (x6 over 3m)  kubelet, docker-for-desktop  Back-off restarting failed container
  Normal   Pulled                 2m (x5 over 4m)  kubelet, docker-for-desktop  Container image "kubeless/java-init@sha256:a14d846bfe53f359f706a260b95f0a9a755883b053dbd17b724e7a3cdff5bae6" already present on machine

Anything else we need to know?:

Environment:

• Kubernetes version (use kubectl version):

Client Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.3", GitCommit:"2bba0127d85d5a46ab4b778548be28623b32d0b0", GitTreeState:"clean", BuildDate:"2018-05-21T09:17:39Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"windows/amd64"}
Server Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.3", GitCommit:"2bba0127d85d5a46ab4b778548be28623b32d0b0", GitTreeState:"clean", BuildDate:"2018-05-21T09:05:37Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}

• Kubeless version (use kubeless version):
  Kubeless version: v1.0.0
• Cloud provider or physical cluster:
  Using kubernetes on docker edge channel for windows.

[dheerajjoshim]

Creating NodeJs or python2.7 or python3.6 functions work properly

[andresmgot]

Hi @dheerajjoshim,

If you don't require external dependencies you don't need a pom.xml file. The current file you are specifying will be automatically included by the build system so you don't need to worry about it. You can deploy the function executing:

kubeless function deploy hello-java -f Hello.java --handler Hello.hello -r java1.8

[dheerajjoshim]

Yeah. This didn't work either. I get same error

kubeless function deploy hello-java -f Hello.java --handler Hello.hello -r java1.8

kubectl.exe get pods
NAME                                                READY     STATUS                  RESTARTS   AGE
hello-646f58c578-r74s6                              1/1       Running                 0          4h
hello-java-57c87d8cd-cvmbs                          0/1       Init:CrashLoopBackOff   5          4m
nodejs-798475b6cf-g6k4h                             1/1       Running                 0          7h

kubectl.exe describe pods hello-java-57c87d8cd-cvmbs
Name:           hello-java-57c87d8cd-cvmbs
Namespace:      default
Node:           docker-for-desktop/192.168.65.3
Start Time:     Tue, 27 Nov 2018 19:57:59 +0530
Labels:         created-by=kubeless
                function=hello-java
                pod-template-hash=137438478
Annotations:    prometheus.io/path=/metrics
                prometheus.io/port=8080
                prometheus.io/scrape=true
Status:         Pending
IP:             10.1.16.196
Controlled By:  ReplicaSet/hello-java-57c87d8cd
Init Containers:
  prepare:
    Container ID:  docker://c6e51eed65f57a1fe81cd2eb030506caa98a4f2a005f394ea302ca44950dd037
    Image:         kubeless/unzip@sha256:f162c062973cca05459834de6ed14c039d45df8cdb76097f50b028a1621b3697
    Image ID:      docker-pullable://kubeless/unzip@sha256:f162c062973cca05459834de6ed14c039d45df8cdb76097f50b028a1621b3697
    Port:          <none>
    Host Port:     <none>
    Command:
      sh
      -c
    Args:
      echo '73cae57c53af18d70df64876eda1d4efd7b14e490fecbbf50851ad930bfc9b49  /src/Hello.java' > /tmp/func.sha256 && sha256sum -c /tmp/func.sha256 && cp /src/Hello.java /kubeless/Hello.java && cp /src/pom.xml /kubeless
    State:          Terminated
      Reason:       Completed
      Exit Code:    0
      Started:      Tue, 27 Nov 2018 19:58:01 +0530
      Finished:     Tue, 27 Nov 2018 19:58:01 +0530
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /kubeless from hello-java (rw)
      /src from hello-java-deps (rw)
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-l2t6z (ro)
  compile:
    Container ID:  docker://8dc2edbfe9a38086b7944069f4f257f134dc22b85f5894436c00766276610d3c
    Image:         kubeless/java-init@sha256:a14d846bfe53f359f706a260b95f0a9a755883b053dbd17b724e7a3cdff5bae6
    Image ID:      docker-pullable://kubeless/java-init@sha256:a14d846bfe53f359f706a260b95f0a9a755883b053dbd17b724e7a3cdff5bae6
    Port:          <none>
    Host Port:     <none>
    Command:
      sh
      -c
    Args:
      /compile-function.sh
    State:       Waiting
      Reason:    CrashLoopBackOff
    Last State:  Terminated
      Reason:    Error
      Message:   [INFO] Scanning for projects...
[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[ERROR] Child module /kubeless/function/params of /kubeless/function/pom.xml does not exist @
[ERROR] Child module /kubeless/function/function of /kubeless/function/pom.xml does not exist @
[ERROR] Child module /kubeless/function/handler of /kubeless/function/pom.xml does not exist @
 @
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]
[ERROR]   The project io.kubeless:kubeless:1.0-SNAPSHOT (/kubeless/function/pom.xml) has 3 errors
[ERROR]     Child module /kubeless/function/params of /kubeless/function/pom.xml does not exist
[ERROR]     Child module /kubeless/function/function of /kubeless/function/pom.xml does not exist
[ERROR]     Child module /kubeless/function/handler of /kubeless/function/pom.xml does not exist
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/ProjectBuildingException

      Exit Code:    1
      Started:      Tue, 27 Nov 2018 20:01:28 +0530
      Finished:     Tue, 27 Nov 2018 20:01:30 +0530
    Ready:          False
    Restart Count:  5
    Environment:
      KUBELESS_INSTALL_VOLUME:  /kubeless
      KUBELESS_FUNC_NAME:       hello
    Mounts:
      /kubeless from hello-java (rw)
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-l2t6z (ro)
Containers:
  hello-java:
    Container ID:
    Image:          kubeless/java@sha256:d2a59e50e8181174ad3c6096cd5d3ce82f46b7e22a6f3a109b0816787e7190d9
    Image ID:
    Port:           8080/TCP
    Host Port:      0/TCP
    State:          Waiting
      Reason:       PodInitializing
    Ready:          False
    Restart Count:  0
    Liveness:       http-get http://:8080/healthz delay=3s timeout=1s period=30s #success=1 #failure=3
    Environment:
      FUNC_HANDLER:             hello
      MOD_NAME:                 Hello
      FUNC_TIMEOUT:             180
      FUNC_RUNTIME:             java1.8
      FUNC_MEMORY_LIMIT:        0
      FUNC_PORT:                8080
      KUBELESS_INSTALL_VOLUME:  /kubeless
    Mounts:
      /kubeless from hello-java (rw)
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-l2t6z (ro)
Conditions:
  Type           Status
  Initialized    False
  Ready          False
  PodScheduled   True
Volumes:
  hello-java:
    Type:    EmptyDir (a temporary directory that shares a pod's lifetime)
    Medium:
  hello-java-deps:
    Type:      ConfigMap (a volume populated by a ConfigMap)
    Name:      hello-java
    Optional:  false
  default-token-l2t6z:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-l2t6z
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:
  Type     Reason                 Age                From                         Message
  ----     ------                 ----               ----                         -------
  Normal   Scheduled              5m                 default-scheduler            Successfully assigned hello-java-57c87d8cd-cvmbs to docker-for-desktop
  Normal   SuccessfulMountVolume  5m                 kubelet, docker-for-desktop  MountVolume.SetUp succeeded for volume "hello-java"
  Normal   SuccessfulMountVolume  5m                 kubelet, docker-for-desktop  MountVolume.SetUp succeeded for volume "hello-java-deps"
  Normal   SuccessfulMountVolume  5m                 kubelet, docker-for-desktop  MountVolume.SetUp succeeded for volume "default-token-l2t6z"
  Normal   Pulled                 5m                 kubelet, docker-for-desktop  Container image "kubeless/unzip@sha256:f162c062973cca05459834de6ed14c039d45df8cdb76097f50b028a1621b3697" already present on machine
  Normal   Created                5m                 kubelet, docker-for-desktop  Created container
  Normal   Started                5m                 kubelet, docker-for-desktop  Started container
  Normal   Created                4m (x4 over 5m)    kubelet, docker-for-desktop  Created container
  Normal   Started                4m (x4 over 5m)    kubelet, docker-for-desktop  Started container
  Normal   Pulled                 4m (x5 over 5m)    kubelet, docker-for-desktop  Container image "kubeless/java-init@sha256:a14d846bfe53f359f706a260b95f0a9a755883b053dbd17b724e7a3cdff5bae6" already present on machine
  Warning  BackOff                54s (x21 over 5m)  kubelet, docker-for-desktop  Back-off restarting failed container

[dheerajjoshim]

Init container messages are strange

      Message:   [INFO] Scanning for projects...
[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[ERROR] Child module /kubeless/function/params of /kubeless/function/pom.xml does not exist @
[ERROR] Child module /kubeless/function/function of /kubeless/function/pom.xml does not exist @
[ERROR] Child module /kubeless/function/handler of /kubeless/function/pom.xml does not exist @
 @
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]
[ERROR]   The project io.kubeless:kubeless:1.0-SNAPSHOT (/kubeless/function/pom.xml) has 3 errors
[ERROR]     Child module /kubeless/function/params of /kubeless/function/pom.xml does not exist
[ERROR]     Child module /kubeless/function/function of /kubeless/function/pom.xml does not exist
[ERROR]     Child module /kubeless/function/handler of /kubeless/function/pom.xml does not exist
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/ProjectBuildingException

[andresmgot]

Hi @dheerajjoshim,

Unfortunately I cannot reproduce the issue. I tried the same function and the same command than you and it works for me:

NAME                                             READY     STATUS    RESTARTS   AGE
hello-java-5b646d7c67-tc6vj                      1/1       Running   0          55s

Maybe something went wrong when creating the function object in Windows? What do you get when you execute:

kubectl get function -o yaml hello-java

From the error message, it seems that it's still detecting a custom pom.xml, maybe it's not empty?

If that doesn't help you can edit the deployment kubectl edit deployment hello-java and modify the command /compile-function.sh and let the container hang with tail -f /dev/null. With that you can enter and debug the compilation manually executing kubectl exec -it <pod_name> -c compile bash.

[dheerajjoshim]

Get function returns following

kubectl get function -o yaml hello-java

apiVersion: kubeless.io/v1beta1
kind: Function
metadata:
  clusterName: ""
  creationTimestamp: 2018-11-28T12:52:44Z
  finalizers:
  - kubeless.io/function
  generation: 1
  labels:
    created-by: kubeless
    function: hello-java
  name: hello-java
  namespace: default
  resourceVersion: "4443420"
  selfLink: /apis/kubeless.io/v1beta1/namespaces/default/functions/hello-java
  uid: 7f9783f1-f30c-11e8-87d1-00155d4b0106
spec:
  checksum: sha256:73cae57c53af18d70df64876eda1d4efd7b14e490fecbbf50851ad930bfc9b49
  deployment:
    metadata:
      creationTimestamp: null
    spec:
      strategy: {}
      template:
        metadata:
          creationTimestamp: null
        spec:
          containers:
          - imagePullPolicy: Always
            name: ""
            resources: {}
    status: {}
  deps: ""
  function: "package io.kubeless;\r\n\r\nimport io.kubeless.Event;\r\nimport io.kubeless.Context;\r\n\r\nimport
    java.lang.RuntimeException;\r\n\r\npublic class Hello {\r\n    public String hello(Event
    event, Context context) {\r\n        return \"Hello world!\";\r\n    }\r\n}"
  function-content-type: text
  handler: Hello.hello
  horizontalPodAutoscaler:
    metadata:
      creationTimestamp: null
    spec:
      maxReplicas: 0
      scaleTargetRef:
        kind: ""
        name: ""
    status:
      conditions: null
      currentMetrics: null
      currentReplicas: 0
      desiredReplicas: 0
  runtime: java1.8
  service:
    ports:
    - name: http-function-port
      port: 8080
      protocol: TCP
      targetPort: 8080
    selector:
      created-by: kubeless
      function: hello-java
    type: ClusterIP
  timeout: "180"

[dheerajjoshim]

Made some progress. Modified deployment to have tail -f /dev/null

kubectl.exe exec -it hello-java-557b4bf7-mt8z4 -c compile /bin/sh

Java file and empty pom file is mounted

/kubeless $ ls
Hello.java  pom.xml

/kubeless $
/kubeless $ cat pom.xml

/kubeless $ cat Hello.java
package io.kubeless;

import io.kubeless.Event;
import io.kubeless.Context;

import java.lang.RuntimeException;

public class Hello {
    public String hello(Event event, Context context) {
        return "Hello world!";
    }
}

/kubeless $

Executing compile-function.sh file didn't create kubeless/lib/ directory. So obviously something went wrong with mvn commmand.

/kubeless $ cd ..
/ $ ./compile-function.sh

/ $ cd kubeless/

/kubeless $ ls
Dockerfile           Dockerfile.init      Hello.java           Makefile             compile-function.sh  examples             function             handler              java.jsonnet         params               pom.xml

/kubeless $ cat pom.xml
<project>
    <modelVersion>4.0.0</modelVersion>
    <groupId>io.kubeless</groupId>
    <artifactId>kubeless</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>kubeless</name>
    <url>http://maven.apache.org</url>
    <modules>
        <module>params</module>
        <module>function</module>
        <module>handler</module>
    </modules>
    <build>
    <plugins>
        <plugin>
        <artifactId>maven-dependency-plugin</artifactId>
        <executions>
            <execution>
            <phase>install</phase>
            <goals>
                <goal>copy-dependencies</goal>
            </goals>
            <configuration>
                <outputDirectory>/kubeless/lib</outputDirectory>
            </configuration>
            </execution>
        </executions>
        </plugin>
    </plugins>
    </build>
</project>

Now checked termination-log. To find out what might be wrong

/kubeless $ cat /dev/termination-log
[ERROR] Could not create local repository at /?/.m2/repository -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/LocalRepositoryNotAccessibleException
/kubeless $

Looks like something went wrong in mvn command. So executed mvn command.

mvn package
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Build Order:
[INFO]
[INFO] kubeless                                                           [pom]
[INFO] params                                                             [jar]
[INFO] function                                                           [jar]
[INFO] handler                                                            [jar]
[INFO]
[INFO] ------------------------< io.kubeless:kubeless >------------------------
[INFO] Building kubeless 1.0-SNAPSHOT                                     [1/4]
[INFO] --------------------------------[ pom ]---------------------------------
[INFO]
[INFO] -------------------------< io.kubeless:params >-------------------------
[INFO] Building params 1.0-SNAPSHOT                                       [2/4]
[INFO] --------------------------------[ jar ]---------------------------------
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-resources-plugin/2.6/maven-resources-plugin-2.6.pom
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] kubeless 1.0-SNAPSHOT .............................. SUCCESS [  0.024 s]
[INFO] params ............................................. FAILURE [ 22.227 s]
[INFO] function ........................................... SKIPPED
[INFO] handler 1.0-SNAPSHOT ............................... SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 22.571 s
[INFO] Finished at: 2018-11-28T13:31:56Z
[INFO] ------------------------------------------------------------------------
[ERROR] Plugin org.apache.maven.plugins:maven-resources-plugin:2.6 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-resources-plugin:jar:2.6: Could not transfer artifact org.apache.maven.plugins:maven-resources-plugin:pom:2.6 from/to central (https://repo.maven.apache.org/maven2): Connect to repo.maven.apache.org:443 [repo.maven.apache.org/151.101.84.215] failed: Connection refused (Connection refused) -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginResolutionException

There it was. I am behind proxy so maven central can't be reached. So created a settings.xml file with proxy information init.

/kubeless $ cat > ?/.m2/settings.xml
<settings>
  <proxies>
      <proxy>
      <id>LOCAL</id>
      <active>true</active>
      <host>**********</host>
      <port>***********</port>
    </proxy>
  </proxies>
</settings>
/kubeless $

mav package and mav install was success

/kubeless $ mvn package
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Build Order:
[INFO]
[INFO] kubeless                                                           [pom]
[INFO] params                                                             [jar]
[INFO] function                                                           [jar]
[INFO] handler                                                            [jar]
[INFO]
[INFO] ------------------------< io.kubeless:kubeless >------------------------
[INFO] Building kubeless 1.0-SNAPSHOT                                     [1/4]
[INFO] --------------------------------[ pom ]---------------------------------
[INFO]
[INFO] -------------------------< io.kubeless:params >-------------------------
[INFO] Building params 1.0-SNAPSHOT                                       [2/4]
[INFO] --------------------------------[ jar ]---------------------------------
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-resources-plugin/2.6/maven-resources-plugin-2.6.pom
Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-resources-plugin/2.6/maven-resources-plugin-2.6.pom (8.1 kB at 1.3 kB/s)
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-plugins/23/maven-plugins-23.pom
.
.
.
.
.
.
.
.
.
.
.
.
[INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ handler ---
[INFO] Building jar: /kubeless/handler/target/handler-1.0-SNAPSHOT.jar
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] kubeless 1.0-SNAPSHOT .............................. SUCCESS [  0.026 s]
[INFO] params ............................................. SUCCESS [05:42 min]
[INFO] function ........................................... SUCCESS [  0.122 s]
[INFO] handler 1.0-SNAPSHOT ............................... SUCCESS [ 14.419 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 05:57 min
[INFO] Finished at: 2018-11-28T13:42:10Z
[INFO] ------------------------------------------------------------------------


/kubeless $ mvn install
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Build Order:
[INFO]
[INFO] kubeless                                                           [pom]
[INFO] params                                                             [jar]
[INFO] function                                                           [jar]
[INFO] handler                                                            [jar]
[INFO]
[INFO] ------------------------< io.kubeless:kubeless >------------------------
[INFO] Building kubeless 1.0-SNAPSHOT                                     [1/4]
[INFO] --------------------------------[ pom ]---------------------------------
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-install-plugin/2.4/maven-install-plugin-2.4.pom
.
.
.
.
.
.
.
.
.
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] kubeless 1.0-SNAPSHOT .............................. SUCCESS [02:26 min]
[INFO] params ............................................. SUCCESS [  0.826 s]
[INFO] function ........................................... SUCCESS [  0.170 s]
[INFO] handler 1.0-SNAPSHOT ............................... SUCCESS [  0.174 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 02:27 min
[INFO] Finished at: 2018-11-28T13:44:56Z
[INFO] ------------------------------------------------------------------------

Figured out what commmand will container execute by checking Dockerfile. But now getting this error

/kubeless $ java -cp /kubeless/lib/*:/kubeless/handler/target/handler-1.0-SNAPSHOT.jar:/kubeless/function/target/function-1.0-SNAPSHOT.jar io.kubeless.Handler
0 [main] ERROR io.kubeless.Handler  - Class: null not found

Not sure what is null class.

[dheerajjoshim]

Ok. I had to set MOD_NAME and FUNC_HANDLER since i am manually trying everything,
So now the question is if some one uses kubeless for Java function execution behind proxy how can they get it to work?

[dheerajjoshim]

We can simplify this. No need to create settings.xml file for maven. We can pass proxy settings to maven command directly.
mvn package -DproxyHost=<proxy_host> -DproxyPort=<proxy_port> -DproxySet=true
mvn install -DproxyHost=<proxy_host> -DproxyPort=<proxy_port> -DproxySet=true

But setting --env while creating the function won't make maven to use those proxy settings.
kubeless function deploy hello-java -f Hello.java --handler Hello.hello -r java1.8 --env proxyHost:<proxy_host> --env proxyPort:<proxy_port>

Can this support be added?

[dheerajjoshim]

#!/bin/sh

set -e

if [[ -s /kubeless/pom.xml ]]; then
  mv /kubeless/pom.xml /kubeless/function-pom.xml
fi

if [[ -n ${PROXY_HOST} && -n ${PROXY_PORT} ]]; then
  MAVEN_OPTS="-DproxyHost=${PROXY_HOST} -DproxyPort=${PROXY_PORT} -DproxySet=true"
fi

cp -r /usr/src/myapp/* /kubeless/
cp /kubeless/*.java /kubeless/function/src/main/java/io/kubeless/
cp /kubeless/function-pom.xml /kubeless/function/pom.xml 2>/dev/null || true
mvn ${MAVEN_OPTS} package > /dev/termination-log 2>&1 && mvn ${MAVEN_OPTS} install > /dev/termination-log 2>&1

[andresmgot]

Thank you for all the debugging @dheerajjoshim! I am glad you found the issue. Since you already found a good solution, would you mind sending a PR to the runtime to fix that?

https://github.com/kubeless/runtimes/blob/master/stable/java/compile-function.sh

A minor comment would be to use instead of PROXY_HOST and PROXY_PORT a more generic env var. We can just use MAVEN_OPTS. That way, if some other user finds a different issue that can be solved with that it can be directly used.

Also, if you submit that PR, it would be useful to document how to use the env var in the docs here:

https://github.com/kubeless/kubeless/blob/master/docs/runtimes.md#java

[dheerajjoshim]

Yeah. I can submit a pull request.

[andresmgot]

@dheerajjoshim since the change has been merged in the Java runtime, would you mind adding a piece of documentation here so we can close the issue?

[dheerajjoshim]

vmware-archive/runtimes#16 This PR is to fix the issue

[dheerajjoshim]

#968 This PR is to update document