# remote debugging java apps https://hackmd.io/@hmoniaga/remote-debugging-java-apps --- ## pre-requisites ### visualvm #### brew ``` brew install --cask visualvm ``` #### sdkman (https://sdkman.io/) ``` sdk install java 8.0.312-zulu # require hotspot based sdk install visualvm ``` ##### run via sdkman ``` visualvm --jdkhome $HOME/.sdkman/candidates/java/8.0.312-zulu ``` --- ## enabling remote jmx deployment.yaml: ``` containers: - env: - name: _JAVA_OPTIONS value: -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.local.only=false -Dcom.sun.management.jmxremote.port=9099 -Dcom.sun.management.jmxremote.rmi.port=9099 -Djava.rmi.server.hostname=127.0.0.1 ``` note: applicable for java8, for java9+ use `JDK_JAVA_OPTIONS` --- ## port forward to local ``` kubectl port-forward <your-app-pod> 9099 ``` --- ## visual vm ### adding connection  --- ### sampling memory/CPU  --- ### monitoring memory leaks  Note: To increase the graphing period from the default one hour, select Tools > Options and update the charts cache. --- ### Thank you! :sheep: