Composite build lifecycle question

Help/Discuss
1

We have a huge number of builds and composite build was a great solution to create virtual projects to save developers’ time. Though I faced few annoying things. I decided not to include other modules into existing builds, but rather develop umbrella projects, which include all needed modules and can be submitted into separate Git repository.
Layout:
Project A (umbrella) includes two modules, depends on them and has a dependency substitution
Project B simple library project
Project C multi module project which depends on B
in one of the B’s submodules I am building fat jar, which filters runtime configuration and includes certain number of jar from it, i.e:

def validJars = ['a-*', 'b-*', 'c-*']
task fatJar(type: Jar) {
    dependsOn configurations.runtime
    zip64 = true
    from (configurations.runtime.collect{ zipTree(it) }) {
        include validJars
    }
    from sourceSets.main.output
    from (fileTree("$projectDir/data"){ includes = dataFiles }.files)
    destinationDir file("$projectStage")
    archiveName "fatjar.jar"
}

This list “validJars” includes project B. Thus when Gradle configures project C, it resolves runtime configuration and actually runs project B (binary dependency is substituted with project). It also builds it during execution phase, which is very annoying. I am trying to debug sources to understand to avoid building substituted dependency during configuration phase, but piece of advice would be appreciated.

2

OK, found solution myself. Not very elegant one, but working.
Move jar task into execution phase of an empty task, thus Gradle resolves configuration only while executing it.

task fatJar {
    doLast {
        jar {}
    }
}