Springboot failsafe multi-module integration test - spring-boot

Question

I have to run integration-test with fail safe and my project is a multi module project, with one module for selenium test and another one with the actual web app.
I want to run the web app then the test over this app and then stopping this app and getting the report of the integration tests.
In order to do this I used this, inside the pom of the selenium test module :
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<executions>
<execution>
<id>reserve-tomcat-port</id>
<goals>
<goal>reserve-network-port</goal>
</goals>
<phase>process-resources</phase>
<configuration>
<portNames>
<portName>tomcat.http.port</portName>
</portNames>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>1.5.9.RELEASE</version>
<executions>
<execution>
<id>pre-integration-test</id>
<goals>
<goal>start</goal>
</goals>
<configuration>
<includes>
<include>
<groupId>com.example</groupId>
<artifactId>web-app</artifactId>
</include>
</includes>
<mainClass>com.example.App</mainClass>
<arguments>
<argument>--server.port=${tomcat.http.port}</argument>
</arguments>
</configuration>
</execution>
<execution>
<id>post-integration-test</id>
<goals>
<goal>stop</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-failsafe-plugin</artifactId>
<configuration>
<systemPropertyVariables>
<test.server.port>${tomcat.http.port}</test.server.port>
</systemPropertyVariables>
</configuration>
</plugin>
The error I get is that the main class is not found :
java.lang.ClassNotFoundException: App
It feels like inside the selenium test I can't get to the webapp classPath, It seems like its trying to run the selenium test main instead of the webapp's one