At build, maven shall call spring-boot-maven-plugin at steps 1 and 3. Can I avoid the warning "found duplicate declaration of plugin"? - maven

Question

I have a Maven build that has three steps :
spring-boot-maven-plugin : starts my application at the beginning of integration-test, stop it at the end of integration-test.
springdoc-openapi-maven-plugin : Asks OpenAPI (= Swagger) to generate yaml files from REST methods existing in my application during integration-test.
spring-boot-maven-plugin : creates the executable fat jar of the spring-boot application.
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<executions>
<execution>
<id>pre-integration-test</id>
<phase>pre-integration-test</phase>
<goals>
<goal>start</goal>
</goals>
</execution>
<execution>
<id>post-integration-test</id>
<phase>post-integration-test</phase>
<goals>
<goal>stop</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.springdoc</groupId>
<artifactId>springdoc-openapi-maven-plugin</artifactId>
<version>${springdoc-openapi-maven-plugin.version}</version>
<executions>
<execution>
<phase>integration-test</phase>
<goals>
<goal>generate</goal>
</goals>
</execution>
</executions>
<configuration>
<apiDocsUrl>http://localhost:9090/v3/api-docs</apiDocsUrl>
<outputFileName>openapi.json</outputFileName>
<outputDir>${project.build.directory}/openapi</outputDir>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
<configuration>
<executable>true</executable>
</configuration>
</plugin>
</plugins>
spring-boot-maven-plugin is called two times, not in the same Maven phase, and a "foreign" maven plugin is used between the callings.
Is there a way I can avoid the warnings about the duplication of the spring-boot-maven-plugin plugin ?
[WARNING] Some problems were encountered while building the effective model for fr.comptes.france:application-metier-et-gestion:jar:0.0.6-SNAPSHOT
[WARNING] 'build.plugins.plugin.(groupId:artifactId)' must be unique but found duplicate declaration of plugin org.springframework.boot:spring-boot-maven-plugin # line 191, column 12
[WARNING]
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING]
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.

Answer 1

Never declare a plugin twice.
Instead, define different executions in the plugin definition. These execution may be in different phases.

Answer 2

#JFabianMeier : Yes. Eventually, I succeeded by reformulating the spring-boot-maven plugin flow of executions :
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<executions>
<!-- Démarrer l'application en intégration -->
<execution>
<id>pre-integration-test</id>
<phase>pre-integration-test</phase>
<goals>
<goal>start</goal>
</goals>
</execution>
<!-- Provoquer la génération yaml par OpenApi des services REST -->
<execution>
<id>post-integration-test</id>
<phase>post-integration-test</phase>
<goals>
<goal>stop</goal>
</goals>
</execution>
<!-- Créer le fat jar exécutable de l'application -->
<execution>
<id>executable-jar</id>
<phase>install</phase>
<goals>
<goal>repackage</goal>
</goals>
<configuration>
<executable>true</executable>
</configuration>
</execution>
</executions>
</plugin>