Caching Maven Dependencies with Docker - improvements

docker/docker-caching/single-module-caching/Dockerfile

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

docker/docker-caching/single-module-caching/Dockerfile-Buildkit

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+FROM maven:alpine as build
+ENV HOME=/usr/app
+RUN mkdir -p $HOME
+WORKDIR $HOME
+ADD . $HOME
+
+RUN --mount=type=cache,target=/root/.m2 mvn -f $HOME/pom.xml clean package
+
+FROM openjdk:8-jdk-alpine
+
+COPY --from=build /usr/app/target/single-module-caching-1.0-SNAPSHOT-jar-with-dependencies.jar /app/runner.jar
+
+ENTRYPOINT java -jar /app/runner.jar

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

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.baeldung</groupId>
+    <artifactId>single-module-caching</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>8</maven.compiler.source>
+        <maven.compiler.target>8</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>31.0.1-jre</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-assembly-plugin</artifactId>
+                <version>3.3.0</version>
+                <configuration>
+                    <descriptorRefs>
+                        <descriptorRef>jar-with-dependencies</descriptorRef>
+                    </descriptorRefs>
+                    <archive>
+                        <manifest>
+                            <addClasspath>true</addClasspath>
+                            <mainClass>com.baeldung.maven_caching.MavenCachingMain</mainClass>
+                        </manifest>
+                    </archive>
+                </configuration>
+                <executions>
+                    <execution>
+                        <id>assemble-all</id>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>single</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>

docker/docker-caching/single-module-caching/src/main/java/com/baeldung/maven_caching/MavenCachingMain.java

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+package com.baeldung.maven_caching;
+
+import com.google.common.io.Files;
+
+public class MavenCachingMain {
+
+    public static void main(String[] args) {
+		System.out.println("Hello from maven_caching app!!!");
+        System.out.println(Files.simplifyPath("/home/app/test"));
+    }
+}