[Solved] Identify the error in this Dockerfile snippet for a multi-stage build:... Identify the error in this Dockerfile snippet for a multi-stage build: FROM openjdk:17 AS builder WORKDIR /app COPY . | Spring Boot

Spring Boot - Docker and Deployment

Identify the error in this Dockerfile snippet for a multi-stage build:

FROM openjdk:17 AS builder
WORKDIR /app
COPY . .
RUN ./mvnw package

FROM openjdk:17-jdk-slim
COPY /app/target/app.jar /app/app.jar
ENTRYPOINT ["java", "-jar", "/app/app.jar"]

AThe first stage should use a Maven image, not openjdk.

BThe ENTRYPOINT syntax is incorrect and will cause a runtime error.

CThe WORKDIR command is missing in the second stage.

DThe COPY command in the second stage uses an absolute path instead of a relative path from the builder stage.

Step-by-Step Solution

Solution:

Step 1: Check COPY command in second stage
The COPY command uses '/app/target/app.jar' which is an absolute path on the host, not from the builder stage.
Step 2: Correct COPY syntax for multi-stage
It should be 'COPY --from=builder /app/target/app.jar /app/app.jar' to copy from the builder stage.
Final Answer:
The COPY command in the second stage uses an absolute path instead of a relative path from the builder stage. -> Option D
Quick Check:
Use COPY --from=builder for multi-stage files [OK]

Quick Trick: Use COPY --from=stage to copy files between stages [OK]

Common Mistakes:

Forgetting --from=builder in COPY
Assuming ENTRYPOINT syntax is wrong
Thinking WORKDIR is required in second stage

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More Spring Boot Quizzes

Identify the error in this Dockerfile snippet for a multi-stage build:

Step 1: Check COPY command in second stage

Step 2: Correct COPY syntax for multi-stage

Final Answer:

Quick Check:

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