Gradle equivalent of Maven Assembly

Question

As long as Gradle has been around, I'd have thought this was well documented, but I'm struggling. Sorry if this is obvious to everyone else.

I have a multi-project build setup with maven, I'm setting up gradle for comparison.

Project A produces a jar file, Project B produces a war file (and depends on the jar from A). Project C I want to create an assembly, i.e. a zip file. The zip file should contain the contents of a directory within project C, the war file from Project B, and the unpacked contents of a tomcat assembly pulled down from Archiva.

The problem I'm having is that when gradle evaluates the build.gradle files, it fails because it can't find the war file - which is no surprise, the war file hasn't been built yet.

So, how do I express the dependency on the war file in such a way that it doesn't cause the failure during evaluation?

apply plugin: 'distribution'

description = """E2am Assembly"""

project(':assembly') {
    dependencies {
        compile project(':webapps/e2am')
    }
}


dependencies {
    compile group: 'com.e2open.platform', name: 'e2am', version:'9.0-SNAPSHOT', ext:'war'
    compile group: 'com.e2open.platform.third-party.tomcat', name: 'tomcat-assembly',version:'7.0.42-1002', classifier:'bin', ext:'zip'
}

task explodeTomcat(type: Copy, dependsOn: ':webapps/e2am:install'){

   configurations.compile.filter { it.toString().endsWith(".zip") }.each{
      from zipTree(it)
   }
   into 'TomcatUnpacked'

   configurations.compile.filter { it.toString().endsWith(".war") }.each{
      from it
   }
   into 'war'

}

distributions {
    main {
        baseName = 'e2am-assembly'
        contents {
            from { 'tomcat' }
            from { 'TomcatUnpacked' }
            from { 'war' }
        }
    }
}


distZip.dependsOn explodeTomcat
install.dependsOn distZip

Also, the top level project applies the 'java' and 'maven' plugin to all sub projects.

The error is:

FAILURE: Build failed with an exception.

* Where:
    Build file '/kwork/wkcopy/e2amA/assembly/build.gradle' line: 25

* What went wrong:
    A problem occurred evaluating project ':assembly'.
    > Could not resolve all dependencies for configuration ':assembly:compile'.
       > Could not find com.e2open.platform:e2am:9.0-SNAPSHOT.
         Required by:
             com.e2open.platform:assembly:9.0-SNAPSHOT

Can someone point me to documentation or a discussion that gets me farther down the road? Thanks!

Answer 1

You should take a look at Multi-project Builds - Project lib dependencies in the Gradle documentation.

Something like this should work:

dependencies{
   compile project(:webapps/e2am)
   compile group: 'com.e2open.platform.third-party.tomcat', name: 'tomcat-assembly',version:'7.0.42-1002', classifier:'bin', ext:'zip'
}

There's also an example that looks a lot like what you are trying to do - might be worth a look :)