Maven execute two modules sequentially

Question

I have two maven projects:

• One builds a few OSGi bundles and creates a local p2 repository containing them
• The other builds an Eclipse plugin with tycho using these bundles

When I execute them separately, everything works: the first execution creates the repository, and the second can use it.

But I want to create a single pom executing both. The simple approach:

<modules>
    <module>p2-repository-generator</module>
    <module>tycho-project</module>
</modules>

Doesn't work, because tycho tries to use the repository generated by the first pom even before it exists as described here.

Can I execute two maven tasks sequentially using maven, without external tools? Or can I delay tycho's dependency hook to a later point in the build?

To clarify:

• tycho-project depends on p2-repository-generator, so it is executed after it.
• but Tycho uses a custom lifecycle participant, which tries to resolve p2 dependencies with an afterProjectsRead callback - which is too soon, since the p2 repository will be there only after p2-repository-generator built it.
• This aggretor works after I execute p2-repository-generator once manually, because then tycho-project is able to find the p2 repository generated by it

Answer 1

As you correctly noted, Tycho does things very early in the build, which leads to problems if you generate content in the same build to be used by the Tycho build. A workaround for this problem is to wrap the part of the build using Tycho in a maven-invoker-plugin call.

Answer 2

Did you try setting a dependency on p2-repository-generator for tycho-project? IMHO it should enforce a build sequence you need here.