I now added the master pom as a common parent for the below parent project
poms:

master
|--> pom.xml (reference below parent projects as relative submodules)

a
|--> a.parent
         |--> pom.xml (parent for this pom is the master pom.xml)
...
|--> a.child
         |--> pom.xml



b
|--> b.parent
         |--> pom.xml (parent for this pom is the master pom.xml)
...
|--> b.child
         |--> pom.xml


c
|--> c.parent
         |--> pom.xml (parent for this pom is the master pom.xml)
...
|--> c.child
         |--> pom.xml 


Now it runs the invoker plugin:

[INFO]
-----------------------------------------------------------------------
[INFO] Reactor Build Order:
[INFO]
[INFO] Master project
[INFO] M3 C Parent Project
[INFO] C Bundle
[INFO] M3 B Parent Project
[INFO] B Bundle
[INFO] M3 A Parent Project
[INFO] A Bundle
[INFO]



but it has no effect. I specify that it should run b.parent before any other
projects:

                        <plugin>
                                <artifactId>maven-invoker-plugin</artifactId>
                                <version>1.5</version>
                                <configuration>
                                        <setupIncludes>
                                                
<setupInclude>../m3.b.parent/pom.xml</setupInclude>
                                        </setupIncludes>
                                        <pomIncludes>
                                                
<pomInclude>*/pom.xml</pomInclude>
                                        </pomIncludes>
                                </configuration>
                                <executions>
                                        <execution>
                                                <id>integration-test</id>
                                                <goals>
                                                        <goal>run</goal>
                                                </goals>
                                        </execution>
                                </executions>
                        </plugin>





It seems that the only thing that has an effect on the order is the order
specified in the <modules> tag:

...
        <name>Master project</name>
        <properties>
                <tycho-version>0.11.0</tycho-version>
        </properties>
        <modules>
                <module>../m3.c.parent</module> 
                <module>../m3.b.parent</module> 
                <module>../m3.a.parent</module>
        </modules>
...

result:

[INFO] Reactor Summary:
[INFO]
[INFO] Master project .................................... SUCCESS [0.661s]
[INFO] M3 C Parent Project ............................... SUCCESS [0.633s]
[INFO] C Bundle .......................................... SUCCESS [1.202s]
[INFO] M3 B Parent Project ............................... SUCCESS [0.013s]
[INFO] B Bundle .......................................... SUCCESS [0.140s]
[INFO] M3 A Parent Project ............................... SUCCESS [0.013s]
[INFO] A Bundle .......................................... SUCCESS [0.126s]
[INFO]
------------------------------------------------------------------------
[INFO] BUILD SUCCESS



I don't use the maven dependency manager since the projects are maven3/tycho
MANIFEST first projects. Further parent/child relations are specified using
relative paths in parent/module tags:

        <parent>
                <artifactId>master</artifactId>
                <groupId>m3</groupId>
                <version>1.0.0-SNAPSHOT</version>
                <relativePath>../m3.master</relativePath>
        </parent>
       
        <modelVersion>4.0.0</modelVersion>
        <groupId>m3</groupId>
        <artifactId>b.parent</artifactId>
        <version>1.0.0-SNAPSHOT</version>
        <packaging>pom</packaging>
        <name>M3 B Parent Project</name>
        <modules>
                <module>../m3.b.bundle</module>
        </modules>


Is this the reason that maven3 falls back to use the order in the modules
tag when determining the effective build order?


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