A Maven plugin to generate Dockerfile and build a docker image based on that file for Spring boot projects. There are 2 goals in this plugin.

• generateDockerfile:
  • Generate a Dockerfile in the root of the project.
  • Config with baseImage and mainClass parameters.
  • This can be bound to any phases, default to generate-resources.
• buildImage:
  • Execute docker build with the generated Dockerfile to build a Docker image.
  • Configure image tag with imageTag parameter.
  • It uses the jar file to build the image, so it should be bound to a phase after package such as install.

• cd to spring-image-maven-plugin folder and run mvn install to install the plugin package to local repository.
• Config the project that we want to use the plugin as the snippet below.
  With this, we can run mvn generate-resources to generate a Dockerfile or mvn install to generate the Dockerfile and build a Docker image.

  <build>
   <pluginManagement>
   <plugins>
   <plugin>
   <groupId>hoaftq.spring_image</groupId>
   <artifactId>spring-image-maven-plugin</artifactId>
   <version>1.0-SNAPSHOT</version>
   <configuration>
   <baseImage>eclipse-temurin:23.0.1_11-jre-ubi9-minimal</baseImage>
   <mainClass>
   hoaftq.example.spring_image_maven_plugin_example.SpringImageMavenPluginExampleApplication
   </mainClass>
   <imageTag>hoaftq/spring-image-maven-plugin-example</imageTag>
   </configuration>
   </plugin>
   </plugins>
   </pluginManagement>
   <plugins>
   <plugin>
   <groupId>hoaftq.spring_image</groupId>
   <artifactId>spring-image-maven-plugin</artifactId>
   <executions>
   <execution>
   <id>docker-file</id>
   <phase>generate-resources</phase>
   <goals>
   <goal>generateDockerfile</goal>
   </goals>
   </execution>
   <execution>
   <id>docker-image</id>
   <phase>install</phase>
   <goals>
   <goal>buildImage</goal>
   </goals>
   </execution>
   </executions>
   </plugin>
   </plugins>
  </build>

They can also be run directly with

• mvn spring-image:generateDockerfile
• mvn spring-image:buildImage: this goal use the jar file, so it should be run after mvn package