Container and Native Deployment

Choose JVM, AOT cache, checkpoint/restore, or native from measured requirements.

Container image

• Prefer Boot build-image tasks with Cloud Native Buildpacks for standard services.
• Preserve dependency, loader, snapshot, and application layers for cache reuse.
• Pin compatible builder/run image families and promote immutable digests.
• Run as non-root and use a read-only filesystem where possible.
• Inject secrets at runtime; never copy credentials into a build context or image layer.
• Configure graceful shutdown and platform termination timing together.

Runtime behavior

• Verify JVM memory and CPU ergonomics under real container limits.
• Expose Actuator liveness and readiness probes separately.
• Use a startup probe for expensive initialization.
• Keep writable paths explicit and bounded.

Native image and AOT

• Use GraalVM 25 or newer with Boot 4 native build support.
• Register narrow RuntimeHints for reflection, resources, serialization, JNI, or proxies.
• Respect the closed-world model: runtime bean topology and classpath cannot change.
• Review profile and conditional-bean behavior during AOT processing.
• Run native integration tests against the produced executable.

Supply chain

• Generate an SBOM, scan the final image, and regularly rebuild on patched run images.
• Sign and attest release images where the delivery platform supports it.

Scan the actual final image by immutable digest, including OS packages and bundled Java dependencies; record the scanner database timestamp and findings that need manual triage. Verify signatures against the expected signer identity and issuer or trusted key, and check that provenance refers to the intended source commit and build workflow. A signature from an arbitrary identity is not a release policy. Retain SBOM/provenance evidence for the promoted digest; rebuilding the same tag produces a different artifact and requires new verification. Test untrusted-signer and digest-mismatch rejection before enforcing a deployment policy. For dependency/BOM remediation and CI trust-boundary review, use java-supply-chain-security if installed; this skill remains responsible for image construction and runtime behavior.

Examples

• See examples/good-dockerfile and examples/bad-dockerfile.

The good example uses Boot's jarmode=tools extraction in a builder stage. A normal Maven package does not create target/dependencies/ or target/application/ directories by itself.

Official sources

• Container images: https://docs.spring.io/spring-boot/reference/packaging/container-images/
• Dockerfiles and layer extraction: https://docs.spring.io/spring-boot/reference/packaging/container-images/dockerfiles.html
• Native images: https://docs.spring.io/spring-boot/reference/packaging/native-image/

Gotchas

• Agent assumes a passing JVM suite proves native compatibility - run the actual native executable.
• Agent adds broad reflection metadata - use the smallest runtime hints possible.
• Agent bakes secrets into layers - inject them only at runtime.
• Agent makes liveness depend on remote systems - use readiness for traffic dependencies.
• Agent selects native only for fashion - benchmark startup, memory, throughput, and build time.
• Agent copies nonexistent target/dependencies directories - extract the packaged jar in a builder stage.

FROM eclipse-temurin:21
COPY . /app
WORKDIR /app
RUN ./mvnw package
ENV DATABASE_PASSWORD=production-secret
ENTRYPOINT ["java", "-jar", "target/app.jar"]

FROM eclipse-temurin:21-jre AS builder
WORKDIR /builder
ARG JAR_FILE=target/*.jar
COPY ${JAR_FILE} application.jar
RUN java -Djarmode=tools -jar application.jar extract --layers --destination extracted

FROM eclipse-temurin:21-jre
WORKDIR /application
COPY --from=builder --chown=1001:1001 /builder/extracted/dependencies/ ./
COPY --from=builder --chown=1001:1001 /builder/extracted/spring-boot-loader/ ./
COPY --from=builder --chown=1001:1001 /builder/extracted/snapshot-dependencies/ ./
COPY --from=builder --chown=1001:1001 /builder/extracted/application/ ./
USER 1001
ENTRYPOINT ["java", "-jar", "application.jar"]

claude plugin marketplace add rrezartprebreza/spring-boot-skills
claude plugin install spring-boot-4-skills@spring-boot-skills

codex plugin marketplace add rrezartprebreza/spring-boot-skills
codex plugin add spring-boot-4-skills@spring-boot-skills