46 lines
1.2 KiB
Docker
46 lines
1.2 KiB
Docker
# ---- STAGE 1: Build ----
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# Use an OpenJDK image that matches the version you develop with.
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# It contains the JDK, but not Maven.
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FROM eclipse-temurin:25-jdk-jammy AS builder
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# Set the working directory
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WORKDIR /app
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# ---- Caching Dependencies ----
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# First, copy the files that define the build, including the Maven Wrapper
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COPY mvnw .
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COPY .mvn .mvn
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COPY pom.xml .
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# Make the wrapper executable
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RUN chmod +x ./mvnw
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# Run a Maven command to download dependencies.
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# Since pom.xml and wrapper files rarely change, this layer will be cached by Docker,
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# speeding up subsequent builds significantly.
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RUN ./mvnw dependency:go-offline
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# ---- Building the Application ----
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# Now, copy the source code. If only source code changes, the layers above are cached.
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COPY src ./src
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# Build the application JAR using the Maven Wrapper
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RUN ./mvnw clean package -DskipTests
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# ---- STAGE 2: Runtime ----
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# Use a lean Eclipse Temurin JRE image for a small and secure final container.
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FROM eclipse-temurin:25-jre-jammy
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# Set the working directory
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WORKDIR /app
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# Copy only the built JAR file from the 'builder' stage
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COPY --from=builder /app/target/*.jar app.jar
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# Expose the application port
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EXPOSE 8080
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# Command to run the application
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ENTRYPOINT ["java", "-jar", "app.jar"]
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