Java Docker

pluginagentmarketplace/custom-plugin-java

This one handles the messy intersection of Java and Docker containers, which is trickier than it looks. It covers multi-stage builds with proper layer caching, JVM container flags like MaxRAMPercentage and UseContainerSupport, and Spring Boot layered JARs. You'll want this when you're tired of bloated images or dealing with OOMKilled containers because the JVM didn't respect memory limits. The base image comparison (temurin vs distroless vs alpine) is actually useful, and it includes security hardening with non-root users and read-only filesystems. Bonded to the java-devops agent, so it knows both Maven/Gradle build contexts and container orchestration.

skills.sh installs: 265
GitHub stars: 42
last updated: Aug 21, 2026

View on GitHub

Install

$ npx -y skills add pluginagentmarketplace/custom-plugin-java --skill java-docker --agent claude-code

Installs into .claude/skills of the current project.

Files

Java Docker Skill

Containerize Java applications with optimized Dockerfiles and JVM settings.

Overview

This skill covers Docker best practices for Java including multi-stage builds, JVM container settings, security hardening, and layer optimization.

When to Use This Skill

Use when you need to:

Create optimized Java Dockerfiles
Configure JVM for containers
Implement security best practices
Reduce image size
Set up health checks

Topics Covered

Dockerfile Optimization

Multi-stage builds
Layer caching strategy
Spring Boot layered JARs
Dependency caching

JVM Container Settings

UseContainerSupport
MaxRAMPercentage
GC selection
Exit on OOM

Security

Non-root users
Read-only filesystem
Vulnerability scanning
Secrets handling

Quick Reference

# Multi-stage optimized Dockerfile
FROM eclipse-temurin:21-jdk-alpine AS builder

WORKDIR /app

# Cache dependencies
COPY pom.xml .
COPY .mvn .mvn
RUN mvn dependency:go-offline -B

# Build and extract layers
COPY src ./src
RUN mvn package -DskipTests && \
    java -Djarmode=layertools -jar target/*.jar extract

# Runtime stage
FROM eclipse-temurin:21-jre-alpine

SKILL.md on GitHub