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Caching Maven Dependencies with Docker
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‎docker/docker-caching/multi-module/Dockerfile‎

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FROM maven:alpine as build
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ENV HOME=/usr/app
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RUN mkdir -p $HOME
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WORKDIR $HOME
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ADD pom.xml $HOME
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ADD core/pom.xml $HOME/core/pom.xml
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ADD application/pom.xml $HOME/application/pom.xml
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RUN mvn -pl core verify --fail-never
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ADD core $HOME/core
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RUN mvn -pl core install
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RUN mvn -pl application verify --fail-never
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ADD application $HOME/application
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RUN mvn -pl core,application package
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FROM openjdk:8-jdk-alpine
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COPY --from=build /usr/app/application/target/application-0.0.1-SNAPSHOT.jar /app/runner.jar
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ENTRYPOINT java -jar /app/runner.jar

‎docker/docker-caching/multi-module/Dockerfile-Buildkit‎

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FROM maven:alpine as build
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ENV HOME=/usr/app
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RUN mkdir -p $HOME
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WORKDIR $HOME
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ADD . $HOME
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RUN --mount=type=cache,target=/root/.m2 mvn -f $HOME/pom.xml clean package
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FROM openjdk:8-jdk-alpine
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COPY --from=build /usr/app/application/target/application-0.0.1-SNAPSHOT.jar /app/runner.jar
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ENTRYPOINT java -jar /app/runner.jar

‎docker/docker-caching/multi-module/application/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>maven-caching</artifactId>
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<groupId>com.baeldung</groupId>
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<version>0.0.1-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<artifactId>application</artifactId>
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<dependencies>
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<dependency>
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<groupId>com.baeldung</groupId>
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<artifactId>core</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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</dependency>
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</dependencies>
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<properties>
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<maven.compiler.source>8</maven.compiler.source>
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<maven.compiler.target>8</maven.compiler.target>
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</properties>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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<configuration>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>

‎docker/docker-caching/multi-module/application/src/main/java/com/baeldung/maven_caching/MavenCachingApplication.java‎

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package com.baeldung.maven_caching;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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@SpringBootApplication
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public class MavenCachingApplication {
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public static void main(String[] args) {
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SpringApplication.run(MavenCachingApplication.class, args);
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CoreClass cc = new CoreClass();
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System.out.println(cc.method());
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}
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}

‎docker/docker-caching/multi-module/application/src/main/resources/application.properties‎

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‎docker/docker-caching/multi-module/application/src/test/java/com/baeldung/maven_caching/MavenCachingApplicationTests.java‎

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package com.baeldung.maven_caching;
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import org.junit.jupiter.api.Test;
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import org.springframework.boot.test.context.SpringBootTest;
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@SpringBootTest
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class MavenCachingApplicationTests {
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@Test
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void contextLoads() {
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}
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}

‎docker/docker-caching/multi-module/core/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>maven-caching</artifactId>
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<groupId>com.baeldung</groupId>
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<version>0.0.1-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<artifactId>core</artifactId>
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<properties>
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<maven.compiler.source>8</maven.compiler.source>
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<maven.compiler.target>8</maven.compiler.target>
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</properties>
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</project>

‎docker/docker-caching/multi-module/core/src/main/java/com/baeldung/maven_caching/CoreClass.java‎

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package com.baeldung.maven_caching;
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public class CoreClass {
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public String method(){
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return "Hello from core module!!";
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}
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}

‎docker/docker-caching/multi-module/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<packaging>pom</packaging>
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<modules>
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<module>application</module>
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<module>core</module>
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</modules>
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>2.6.3</version>
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<relativePath/> <!-- lookup parent from repository -->
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</parent>
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<groupId>com.baeldung</groupId>
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<artifactId>maven-caching</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<name>maven-caching</name>
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<description>maven-caching</description>
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<properties>
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<java.version>1.8</java.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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</dependency>
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</dependencies>
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</project>

‎docker/docker-caching/single-module/Dockerfile‎

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FROM maven:alpine as build
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ENV HOME=/usr/app
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RUN mkdir -p $HOME
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WORKDIR $HOME
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ADD pom.xml $HOME
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RUN mvn verify --fail-never
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ADD . $HOME
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RUN mvn package
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FROM openjdk:8-jdk-alpine
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COPY --from=build /usr/app/target/maven-caching-1.0-SNAPSHOT-jar-with-dependencies.jar /app/runner.jar
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ENTRYPOINT java -jar /app/runner.jar

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