After build a image using kaniko the java compiler cannot be find be maven on a jenkins node

[qalinn]

Actual behavior After the build image using kaniko on a jenkins node maven cannot find the javac.

Expected behavior After the build of an image using kaniko you must be able to continue use maven and java on a container. To Reproduce Steps to reproduce the behavior:

1. Create a docker image with java, maven and kaniko 1.6.0 inside. In my case I have created a jenkins agent:

   FROM gcr.io/kaniko-project/executor:v1.6.0 as kaniko 
   FROM jenkins/inbound-agent:4.7-1-jdk11 
   USER root 
   ENV JAVA_OPTS -XX:-UsePerfData 
   RUN apt-get update && apt-get install -y --no-install-recommends apt-transport-https ca-certificates gnupg2 software-properties-common maven 
   COPY --from=kaniko /kaniko /kaniko 
   RUN cp /kaniko/executor /kaniko/kaniko-executor 
   COPY ./config.json /kaniko/.docker/ 
   ENV PATH=$PATH:/kaniko 
   ENV DOCKER_CONFIG=/kaniko/.docker/ 
   WORKDIR /kaniko

2. Run a container based on the previous docker file.
3. Build a java project using maven inside of the container previously created.
4. Build a docker file using kaniko inside of the container previously created.
5. Try to build again the java project using maven.
6. The maven has complained cannot find the javac. [ERROR] No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?
7. Before to run kaniko build I have executed the following commands:

   + which javac
   /usr/local/openjdk-11/bin/javac
   **+ javac --version
   Picked up _JAVA_OPTIONS: -Djdk.net.URLClassPath.disableClassPathURLCheck=true
   javac 11.0.10**
   [Pipeline] sh
   + echo ---1-------
   + ls -la /usr/local/openjdk-11/
   total 44
   drwxr-xr-x  1 root root 4096 Mar 12 23:13 .
   drwxr-xr-x  1 root root 4096 Mar 12 23:13 ..
   drwxrwxr-x  2 root root 4096 Jan 12 11:31 bin
   drwxrwxr-x  4 root root 4096 Jan 12 11:31 conf
   drwxrwxr-x  4 root root 4096 Jan 12 11:31 demo
   drwxrwxr-x  3 root root 4096 Jan 12 11:31 include
   drwxrwxr-x  2 root root 4096 Jan 12 11:31 jmods
   drwxrwxr-x 73 root root 4096 Jan 12 11:31 legal
   drwxrwxr-x  1 root root 4096 Jan 12 11:31 lib
   drwxrwxr-x  4 root root 4096 Jan 12 11:31 man
   -rw-rw-r--  1 root root 1220 Jan 12 11:31 release
   + ls -la /usr/local/openjdk-11/bin/javac
   **-rwxrwxr-x 1 root root 13173 Jan 12 11:31 /usr/local/openjdk-11/bin/javac**

8. After the kaniko build I have executed the same commands:

   which javac
   /usr/local/openjdk-11/bin/javac
   [Pipeline] sh
   + echo ---2-------
   + ls -la /usr/local/openjdk-11/
   total 68
   drwxr-xr-x 1 root root 4096 Jun 15 00:13 .
   drwxr-xr-x 1 root root 4096 Jun 15 00:12 ..
   drwxrwxr-x 1 root root 4096 Jun 15 00:13 bin
   drwxrwxr-x 1 root root 4096 Jun 15 00:13 conf
   drwxrwxr-x 4 root root 4096 Jan 12 11:31 demo
   drwxrwxr-x 3 root root 4096 Jan 12 11:31 include
   drwxrwxr-x 2 root root 4096 Jan 12 11:31 jmods
   drwxrwxr-x 1 root root 4096 Jan 12 11:31 legal
   drwxrwxr-x 1 root root 4096 Jun 15 00:13 lib
   drwxrwxr-x 1 root root 4096 Jun 15 00:13 man
   -rw-rw-r-- 1 root root  999 Apr  9 14:24 release
   + ls -la /usr/local/openjdk-11/bin/javac
   -rwxrwxr-x 1 root root 13173 Jan 12 11:31 /usr/local/openjdk-11/bin/javac
   + javac --version
   Picked up _JAVA_OPTIONS: -Djdk.net.URLClassPath.disableClassPathURLCheck=true
   Error occurred during initialization of boot layer
   java.lang.module.FindException: Module jdk.compiler not found

9. The javac seems to be there but the maven cannot see.
11. I have tried without kaniko and is working.
12. For build kaniko image I have used the following command:

    kaniko-executor --force --context=. --dockerfile=Dockerfile --use-new-run=true \
                            --cache \
                            --cache-repo=repo/all-repos-cache \
                            --no-push \
                            --destination=repo/image

13. Is the same results without cache flag. Additional Information

    • Dockerfile FROM openjdk:11-jre VOLUME /tmp COPY fileA /root/somefolder/fileA COPY some.jar some.jar COPY app.jar app.jar RUN mkdir -p /root/localFolder/local/system ; \ echo "READY" > /root/localFolder/local/system/status.trigger;
      ENTRYPOINT ["java", "some params" "-jar", "/app.jar"]

    • Build Context Please provide or clearly describe any files needed to build the Dockerfile (ADD/COPY commands)

    • Kaniko Image (fully qualified with digest)

    Triage Notes for the Maintainers

    Description	Yes/No
    Please check if this a new feature you are proposing	- [ ]
    Please check if the build works in docker but not in kaniko	- [x]
    Please check if this error is seen when you use --cache flag	- [x]
    Please check if your dockerfile is a multistage dockerfile	- [ ]

[qalinn]

Any help will be appreciated.