I have a maven multi module project designed like the first answer in following SO post: Multi-module maven with Spring Boot
Now I want a common maven module that can contain some models to be used by multiple microservices. If I make this common project as a child of the first level parent pom (so that all dependencies injected by boot like jpa, jackson etc are available to common), then STS/Spring is detecting it as a boot application and complains about no Main class on maven build.
Can someone suggest how I can achieve this?
Current Code:
parent pom.xml: (Only relevant parts included)
<project>
<name>...</name>
<groupId>...</groupId>
<artifactId>...</artifactId>
<packaging>pom</packaging>
<version>...</version>
<parent>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-parent</artifactId>
<version>Brixton.M3</version>
<relativePath />
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jetty</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
child (common module) pom.xml (only relevant parts), not to be boot app:
<project>
<artifactId>...</artifactId>
<version>...</version>
<name>...</name>
<parent>
<groupId>...</groupId>
<artifactId>...</artifactId>
<version>...</version>
</parent>
</project>
To skip the basics, do the following: Download and unzip the source repository for this guide, or clone it using Git: git clone https://github.com/spring-guides/gs-multi-module.git. cd into gs-multi-module/initial. Jump ahead to Create the Library Project.
A multi-module project is built from an aggregator POM that manages a group of submodules. In most cases, the aggregator is located in the project's root directory and must have packaging of type pom. The submodules are regular Maven projects, and they can be built separately or through the aggregator POM.
I don't have all the details regarding your project but my best guess is that the spring-boot-maven-plugin
is defined on the parent (or you are using the spring-boot-starter-parent
in your root pom). This effectively ask the build to package your module as a Spring Boot app (which is not what you want).
STS probably looks for that hint to figure out if a module contains a Spring Boot application or not. Maybe it would be nicer if it looks for a main class annotated with @EnableAutoConfiguration
(or SpringBootApplication
).
You can fix the problem easily (from the build side) by specifying the skip property of the repackage goal
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<skip>true</skip>
</configuration>
</plugin>
If STS still picks up the module as a Spring Boot app, I'd create an issue in their tracker
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