maven - One Spring Boot project, deploy to both JAR or WAR

Question

Is there a way to have a single Spring Boot project be packagable into both JAR and WAR without changing the pom.xml or the application source?

I've read Converting a Spring Boot JAR Application to a WAR, but it converts the project to WAR and it loses the ability to be packaged as JAR.

I don't expect mvn package to do both. What I want is something like mvn i-want-a-jar and it would package the project as JAR. Or I could run mvn i-want-a-war and it would package the project as WAR.

Is this possible?

Answer 1

I managed to do it by adding

<packaging>${packaging.type}</packaging>

to the POM file and then setting different profiles for JAR and WAR:

  <profiles>
    <profile>
      <id>jar</id>
      <properties>
        <packaging.type>jar</packaging.type>
      </properties>
    </profile>
    <profile>
      <id>war</id>
      <properties>
        <packaging.type>war</packaging.type>
      </properties>
      <dependencies>
        <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-tomcat</artifactId>
          <scope>provided</scope>
        </dependency>
      </dependencies>
    </profile>
  </profiles>

Now mvn package -P war produces a WAR and mvn package -P jar produces a JAR.

Another option is to create separate modules for JAR and WAR, but I didn't go that route.