####
cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: Pod
metadata:
  name: tilo-java
spec:
 containers:
   - name: tilo-java
     #image: registry.access.redhat.com/ubi8/openjdk-8-runtime
     image: registry.access.redhat.com/ubi8/openjdk-17-runtime
     command: ["sh"]
     args: ["-c", "while true ; do echo alive ; sleep 3600 ; done"]	
     resources:
       requests:
         memory: 512Mi
         cpu: 50m
       limits:
         memory: 8Gi
         cpu: 4	 
EOF

##exec to container 
oc exec -it tilo-java -- bash
##and run: 
java -XX:MaxRAMPercentage=85.0 -XshowSettings:vm -version
##kill pod and switch the image to other java

[jboss@tilo-java ~]$ java -XX:MaxRAMPercentage=85.0 -XshowSettings:vm -version
VM settings:
    Max. Heap Size (Estimated): 3.03G
    Ergonomics Machine Class: server
    Using VM: OpenJDK 64-Bit Server VM

openjdk version "1.8.0_462"
OpenJDK Runtime Environment (build 1.8.0_462-b08)
OpenJDK 64-Bit Server VM (build 25.462-b08, mixed mode)

[jboss@tilo-java ~]$ java -XX:MaxRAMPercentage=85.0 -XshowSettings:vm -version
VM settings:
    Max. Heap Size (Estimated): 6.81G
    Using VM: OpenJDK 64-Bit Server VM

openjdk version "17.0.16" 2025-07-15 LTS
OpenJDK Runtime Environment (Red_Hat-17.0.16.0.8-1) (build 17.0.16+8-LTS)
OpenJDK 64-Bit Server VM (Red_Hat-17.0.16.0.8-1) (build 17.0.16+8-LTS, mixed mode, sharing)