Java J9 in Containers

IBM and Semeru Java in Containers

Recipe

1. In general, tune -XX:MaxRAMPercentage and -XX:InitialRAMPercentage instead of -Xmx and -Xms, respectively, to allow for more flexibility with sizing of containers at the host level. Default values depend on any container memory limit.
2. Consider using -XX:+ClassRelationshipVerifier to improve start-up time.
3. If using Semeru Java >= 11 and memory in the pod is limited, consider using the remote JITServer on available platforms to avoid potential throughput issues.

Container Images

• IBM Container Registry:
  • IBM Semeru Runtimes Java 8 Open Edition on UBI: FROM icr.io/appcafe/ibm-semeru-runtimes:open-8-jre-ubi or FROM icr.io/appcafe/ibm-semeru-runtimes:open-8-jdk-ubi
  • IBM Semeru Runtimes Java 8 Open Edition on Ubuntu: FROM icr.io/appcafe/ibm-semeru-runtimes:open-8-jre-focal or FROM icr.io/appcafe/ibm-semeru-runtimes:open-8-jdk-focal
  • IBM Semeru Runtimes Java 11 Certified Edition on UBI: FROM icr.io/appcafe/ibm-semeru-runtimes:certified-11-jre-ubi or FROM icr.io/appcafe/ibm-semeru-runtimes:certified-11-jdk-ubi
  • IBM Semeru Runtimes Java 11 Certified Edition on Ubuntu: FROM icr.io/appcafe/ibm-semeru-runtimes:certified-11-jre-focal or FROM icr.io/appcafe/ibm-semeru-runtimes:certified-11-jdk-focal
  • IBM Semeru Runtimes Java 17 Certified Edition on UBI: FROM icr.io/appcafe/ibm-semeru-runtimes:certified-17-jre-ubi or FROM icr.io/appcafe/ibm-semeru-runtimes:certified-17-jdk-ubi
  • IBM Semeru Runtimes Java 17 Certified Edition on Ubuntu: FROM icr.io/appcafe/ibm-semeru-runtimes:certified-17-jre-focal or FROM icr.io/appcafe/ibm-semeru-runtimes:certified-17-jdk-focal
  • See all tags:

    curl -s https://icr.io/v2/appcafe/ibm-semeru-runtimes/tags/list | jq .tags

• DockerHub
  • IBM Semeru Runtimes:
    • IBM Semeru Runtimes Java 8 Open Edition on CentOS: FROM docker.io/ibm-semeru-runtimes:open-8-jre-centos7 or FROM docker.io/ibm-semeru-runtimes:open-8-jdk-centos7
    • IBM Semeru Runtimes Java 8 Open Edition on Ubuntu: FROM docker.io/ibm-semeru-runtimes:open-8-jre-focal or FROM docker.io/ibm-semeru-runtimes:open-8-jdk-focal
    • IBM Semeru Runtimes Java 11 Open Edition on CentOS: FROM docker.io/ibm-semeru-runtimes:open-11-jre-centos7 or FROM docker.io/ibm-semeru-runtimes:open-11-jdk-centos7
    • IBM Semeru Runtimes Java 11 Open Edition on Ubuntu: FROM docker.io/ibm-semeru-runtimes:open-11-jre-focal or FROM docker.io/ibm-semeru-runtimes:open-11-jdk-focal
    • IBM Semeru Runtimes Java 17 Open Edition on CentOS: FROM docker.io/ibm-semeru-runtimes:open-17-jre-centos7 or FROM docker.io/ibm-semeru-runtimes:open-17-jdk-centos7
    • IBM Semeru Runtimes Java 17 Open Edition on Ubuntu: FROM docker.io/ibm-semeru-runtimes:open-17-jre-focal or FROM docker.io/ibm-semeru-runtimes:open-17-jdk-focal
    • See all IBM Semeru Runtimes tags:

      curl -L -s "https://registry.hub.docker.com/v2/repositories/library/ibm-semeru-runtimes/tags?page=1&page_size=100" | jq '.results[].name'

  • IBM Java:
    • IBM Java 8 on Ubuntu: FROM docker.io/ibmjava:8-jre or FROM docker.io/ibmjava:8-sdk
    • IBM Java 8 on Alpine: FROM docker.io/ibmjava:8-jre-alpine or FROM docker.io/ibmjava:8-sdk-alpine
    • See all IBM Java 8 tags:

      curl -L -s "https://registry.hub.docker.com/v2/repositories/library/ibmjava/tags?page=1&page_size=100" | jq '.results[].name'

Run Examples

Compile and run a simple Java program:

podman run --rm icr.io/appcafe/ibm-semeru-runtimes:certified-17-jdk-ubi sh -c "cd /tmp; printf 'public class main { public static void main(String... args) throws Throwable { System.out.println(\"Hello World\"); } }' > main.java && javac main.java && java -showversion main"

Run a program in the background and do something on it:

podman run --rm icr.io/appcafe/ibm-semeru-runtimes:certified-17-jdk-ubi sh -c "cd /tmp; printf 'public class main { public static void main(String... args) throws Throwable { System.out.println(\"Hello World\"); Object o = new Object(); synchronized (o) { o.wait(); } } }' > main.java && javac main.java && (java main &); sleep 1; jcmd \$(jps | grep -v Jps | sed 's/ main//g') Dump.java; sleep 1; head javacore*txt"

To start an interactive session, add -it after --rm. For example:

podman run --rm -it icr.io/appcafe/ibm-semeru-runtimes:certified-17-jdk-ubi bash

Containerfiles

• IBM Java
• Semeru Runtime Open Edition

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