docker-java

To avoid OOMKills in Java Docker containers, use cgroup-aware JVM flags like UseContainerSupport and MaxRAMPercentage instead of fixed -Xmx values. This allows the JVM to dynamically respect container memory limits.

A layered jar splits a Spring Boot application into distinct layers, allowing Docker to cache dependencies separately from application code. This reduces rebuild times and limits cache invalidation scope when updating only application classes.

Create a production-ready Spring Boot Dockerfile using multi-stage builds by separating the builder stage from the runtime stage, running as a non-root user, adding health checks, and pinning base image digests for reproducible, secure images.

Choose a Dockerfile for granular control over layered jars, multi-stage builds, and security hardening. Choose Spring Boot buildpacks with bootBuildImage for automated, opinionated image generation without writing Dockerfile syntax.

Java applications get OOMKilled in Docker despite fixed -Xmx because the JVM ignores container cgroup limits by default in older versions. Use UseContainerSupport and MaxRAMPercentage to ensure the JVM respects the container memory boundaries.

Configure non-root execution in Java Docker containers by creating a dedicated user in the Dockerfile and switching to it. Add health checks using Spring Boot Actuator endpoints to ensure orchestration platforms can monitor container readiness.