create spring boot native image in a multi module project - spring-boot

Question

i am trying to build an native image with graalvm and spring boot.
my project has several modules.when i try to build native image i got this error:
Error: Please specify class (or <module>/<mainclass>) containing the main entry point method. (see --help)
and when i define mainClass path(org.example.api.Application) in properties in parent pom file i got this error:
Error: Main entry point class 'org.example.api.Application' neither found on the classpath nor on the modulepath.
how can i define the module that contain main class for graalvm?

Answer 1

In your parent pom (the one where you declare all your modules) using the syntax
<modules>
<module>module1</module>
<module>module2</module>
<module>module3</module>
</modules>
use the latest Spring Boot BOM as parent
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>3.0.1</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
then override the native profile
<profiles>
<profile>
<id>native</id>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.graalvm.buildtools</groupId>
<artifactId>native-maven-plugin</artifactId>
<executions>
<execution>
<id>build-image</id>
<goals>
<goal>compile-no-fork</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</pluginManagement>
</build>
</profile>
</profiles>
At this point in your modules (where you need native builds) you can set this build configuration:
<build>
<plugins>
<plugin>
<groupId>org.graalvm.buildtools</groupId>
<artifactId>native-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
At this point you will be able to compile the project(s) using the mvn -Pnative clean package