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I want to reduce my Docker image size which should contain the JDK 17 and my app.jar. I decided to do it using jlink by extracting the JDK which would include only the needed modules my application needs to run.
The main process of extracting the JDK looks like this:
RUN jar xf ./target/app.jar
RUN jdeps --ignore-missing-deps --print-module-deps --multi-release 17 --recursive --class-path ./BOOT-INF/lib/* ./target/app.jar > modules.txt
RUN jlink --add-modules $(cat modules.txt) --strip-debug --no-man-pages --no-header-files --output jre-17
It works perfectly on my local machine (Windows 10) but doesn't in Docker (openjdk:17-alpine). I get this error:
------
> [auth build 7/8] RUN jdeps --ignore-missing-deps --print-module-deps --multi-release 17 --recursive --class-path ./BOOT-INF/lib/* ./target/app.jar > modules.txt:
5.271 Exception in thread "main" java.lang.module.FindException: Module jakarta.cdi not found, required by jakarta.transaction
5.347 at java.base/java.lang.module.Resolver.findFail(Resolver.java:893)
5.347 at java.base/java.lang.module.Resolver.resolve(Resolver.java:192)
5.347 at java.base/java.lang.module.Resolver.resolve(Resolver.java:141)
5.347 at java.base/java.lang.module.Configuration.resolve(Configuration.java:421)
5.350 at java.base/java.lang.module.Configuration.resolve(Configuration.java:255)
5.355 at jdk.jdeps/com.sun.tools.jdeps.JdepsConfiguration$Builder.build(JdepsConfiguration.java:564)
5.355 at jdk.jdeps/com.sun.tools.jdeps.JdepsTask.buildConfig(JdepsTask.java:603)
5.355 at jdk.jdeps/com.sun.tools.jdeps.JdepsTask.run(JdepsTask.java:557)
5.355 at jdk.jdeps/com.sun.tools.jdeps.JdepsTask.run(JdepsTask.java:533)
5.355 at jdk.jdeps/com.sun.tools.jdeps.Main.main(Main.java:49)
------
failed to solve: process "/bin/sh -c jdeps --ignore-missing-deps --print-module-deps --multi-release 17 --recursive --class-path ./BOOT-INF/lib/* ./target/app.jar > modules.txt" did not complete successfully: exit code: 1
Here's my Dockerfile:
# Build application
FROM openjdk:17-alpine AS build
# Install Maven
RUN apk update && apk add wget && apk add binutils
RUN wget .9.9/binaries/apache-maven-3.9.9-bin.tar.gz \
&& tar -xzvf apache-maven-3.9.9-bin.tar.gz -C /opt/ \
&& rm apache-maven-3.9.9-bin.tar.gz
ENV PATH=$PATH:/opt/apache-maven-3.9.9/bin
WORKDIR /build
COPY . .
# RUN mvn clean package -DskipTests
RUN jar xf ./target/app.jar
RUN jdeps --ignore-missing-deps --print-module-deps --multi-release 17 --recursive --class-path ./BOOT-INF/lib/* ./target/app.jar > modules.txt
RUN RUN jlink --add-modules $(cat modules.txt) --strip-debug --no-man-pages --no-header-files --output jre-17
# Run application
FROM alpine:latest
WORKDIR /jre
COPY --from=build /build/jre-17 .
ENV JAVA_HOME /jre
ENV PATH=$PATH:$JAVA_HOME/bin
WORKDIR /app
COPY --from=build /build/target/app.jar .
CMD ["java", "-jar", "./app.jar"]
What is wrong with my Dockerfile?
pom.xml:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns=".0.0" xmlns:xsi=";
xsi:schemaLocation=".0.0 .0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>3.3.2</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>arkadisahakyan</groupId>
<artifactId>authentication-with-spring</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>authentication-with-spring</name>
<description>Demo project</description>
<properties>
<java.version>17</java.version>
<start-class>arkadisahakyan.authenticationwithspring.AuthenticationWithSpringApplication</start-class>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
</dependency>
<dependency>
<groupId>org.thymeleaf.extras</groupId>
<artifactId>thymeleaf-extras-springsecurity6</artifactId>
</dependency>
<dependency>
<groupId>com.mysql</groupId>
<artifactId>mysql-connector-j</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>2.2.224</version>
</dependency>
<dependency>
<groupId>org.modelmapper</groupId>
<artifactId>modelmapper</artifactId>
<version>3.2.0</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.30</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-core</artifactId>
<version>5.12.0</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>app</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
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