Spring Boot multi module Maven project deployment - maven

Question

We have multi module Maven project with following modules:
Commons
Model
Repository
Service
Web
We've googled around and we didn't found a solution how to make one executable jar when project has this kind of structure.
Here is the parent pom.xml:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>...</groupId>
<artifactId>...</artifactId>
<version>1.0-SNAPSHOT</version>
<modules>
<module>Model</module>
<module>Web</module>
<module>Service</module>
<module>Repository</module>
<module>Common</module>
</modules>
<packaging>pom</packaging>
<name>Api</name>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java.version>1.8</java.version>
<mssql.jdbc.driver.version>4.2</mssql.jdbc.driver.version>
<apache.commons.lang.version>3.3.2</apache.commons.lang.version>
<apache.commons.collection.utils.version>4.1</apache.commons.collection.utils.version>
</properties>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.1.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-envers</artifactId>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-jsr310</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
</dependency>
</dependencies>
</project>
So, very basic parent pom.xml. We know that we can't use Spring Boot Maven plugin when packaging is pom, so we've defined it in pom.xml from Web module:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>...</artifactId>
<groupId>...</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<groupId>...</groupId>
<artifactId>...</artifactId>
<packaging>jar</packaging>
<name>...</name>
<dependencies>
<dependency>
<groupId>...</groupId>
<artifactId>Service</artifactId>
<version>${project.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>1.4.1.RELEASE</version>
<configuration>
<mainClass>...App</mainClass>
</configuration>
<!--<executions>-->
<!--<execution>-->
<!--<goals>-->
<!--<goal>repackage</goal>-->
<!--</goals>-->
<!--</execution>-->
<!--</executions>-->
</plugin>
</plugins>
</build>
</project>
The rest of pom.xmls from other modules are pretty much the same: Service's pom.xml includes Repository.jar, Repository includes Model and Common.
Problem 1: when we run mvn install, plugin creates fat jar in target folder of web module. But when we try to run it with java -jar name-of-jar it gives java.lang.NoClassDefFoundError about some class from Service module - and you can see from Web's pom.xml that Service module is included (there is also a Service.jar packed as library in Web.jar)
Problem 2: what's interesting is that Service.jar inside of Web.jar also contains pretty much all the dependencies that are already present in Web.jar - basically they are duplicated.
Did anyone managed to create executable fat jar using Spring Boot Maven plugin and Maven Module project structure?

Answer 1

Problem 1 & 2
You should not have devtools as dependency in your parent pom.
Move the following to the web/spring-boot module:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
</dependency>
If you look at devtools's pom, it includes the following:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-autoconfigure</artifactId>
</dependency>
So your service jar ends up with some spring boot dependencies.