[gradle-user] Maven dependency exclusion

[Gretar Arnason]

Hi all, I needed gradle to create pom's that would add exclusion clauses to
dependencies that we have marked as non-transitive in our dependencies
section.
After some digging around I ended up with the following build script which
gets me what I wanted.
However I can't feel but there is a simpler way to achieve this so I'm
posting here in the hope that someone could give me some pointers if I'm
barking up the wrong tree.
I used 1.0-M3.

build.gradle:
apply plugin: 'nexusBuild'

version = 1.0

dependencies {
    compile 'log4j:log4j:1.2.13'
    compile('jaxen:jaxen:1.1.1') {
        transitive = false
    }
}

afterEvaluate {
    nonTransitiveDeps = configurations.all*.dependencies*.findAll {
!it.transitive }.flatten()
}

uploadArchives.repositories.whenObjectAdded {
    it.pom.whenConfigured {pom ->
        pom.dependencies.each {
            if (nonTransitiveDeps.find({ dep -> dep.group == it.groupId}) !=
null) {
                //I am always getting an 'unable to resolve class
org.apache.maven.model.Exclusion' error
                //hence the strange constructor invocation
                def exclusion =
pom.model.class.classLoader.loadClass("org.apache.maven.model.Exclusion").newInstance();
                exclusion.setGroupId('*')
                exclusion.setArtifactId('*')
                it.addExclusion(exclusion)
            }
        }
    }
}

the pom generated is:
<?xml version="1.0" encoding="UTF-8"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven-4.0.0.xsd"; xmlns="
http://maven.apache.org/POM/4.0.0";
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>
  <modelVersion>4.0.0</modelVersion>
  <groupId>calidris</groupId>
  <artifactId>dummy</artifactId>
  <version>1.0.0</version>
  <dependencies>
    <dependency>
      <groupId>jaxen</groupId>
      <artifactId>jaxen</artifactId>
      <version>1.1.1</version>
      <scope>compile</scope>
*      <exclusions>
        <exclusion>
          <artifactId>*</artifactId>
          <groupId>*</groupId>
        </exclusion>
      </exclusions>*
    </dependency>
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.13</version>
      <scope>compile</scope>
    </dependency>
  </dependencies>
</project>

nexusBuild plugin is a plugin that sets up repositories for uploading and
downloading depending on parameter(snapshot/release) + adding the java
plugin + some other minor stuff.