Gradle: using resources in a dependency jar as a sourceset

Question

Suppose I have a build.gradle thus:

dependencies {
    compile 'com.group:some-app:1.0.1'
    compile 'com.group:some-app:1.0.1:sources'
}

sourceSets {
    main {
        other {
             srcDir 'src/main/other'
        }
    }
}

So some-app-1.0.1-sources.jar has source files in it - not Java files, but files from which Java can be generated.

How do I include those files in sourceSets ?

Sigismondo

Answer 1

You can extract the files from the source jar on the fly into a directory, and add the directory to a source set.

configurations {
   sourceJar
}

dependencies {
    compile 'com.group:some-app:1.0.1'
    sourceJar 'com.group:some-app:1.0.1:sources'
}

def generatedDir = "$build/other"
task extractFiles(type: Copy) {

    from (zipTree(configurations.sourceJar.singleFile)) 

    into generatedDir 
}

sourceSets {
    main {
        resources {
             srcDir generatedDir
        }
    }
}

Prey

I'm running into 2 errors with this. Possibly I'm just doing something wrong? 1) InvalidUserDataException: Cannot change strategy of configuration ':sourceJar' after it has been resolved. 2) Expected configuration ':sourceJar' to contain exactly one file, however, it contains 18 files. – Sigismondo

The source jar may have transitive dependencies. Try adding the "transitive=false". dependencies { sourceJar ('com.group:some-app:1.0.1:sources') { transitive=false }} – Prey

transitive=false hasn't fixed it. I can include all your code except the from(zipTree(...)) line. That appears to be what breaks it. But is that referencing something earlier in the config? – Sigismondo

Based upon what I've read elsewhere, I tried adding doLast { ...} to the task. It doesn't error, but I think it's also not running at all. – Sigismondo

If I explicitly call the task with gradle extractFiles, I don't see anything extracted :( – Sigismondo

$build does not exist, it should be $buildDir – Florentinaflorentine

can you show the dependencies of com.group:some-app:1.0.1:sources? – Prey

The transitive dependencies are many. I did add { transitive=false }. And the non-source .jar is used as part of the normal build just fine. – Sigismondo