Use PMD's Copy/Paste Detector with Gradle - ant

Question

I'd like to use Copy/Paste Detector in my Gradle build.
This is why I've decided to translate the following Ant task (which I've found here) into Gradle syntax:
<target name="cpd">
<taskdef name="cpd" classname="net.sourceforge.pmd.cpd.CPDTask" />
<cpd minimumTokenCount="100" outputFile="/home/tom/cpd.txt">
<fileset dir="/home/tom/tmp/ant">
<include name="**/*.java"/>
</fileset>
</cpd>
</target>
This is how the translation looks currently:
check << {
ant.taskdef(name: 'cpd', classname: 'net.sourceforge.pmd.cpd.CPDTask', classpath: configurations.pmd.asPath)
ant.cpd(minimumTokenCount: '100', outputFile: file('build/reports/pmd/copyPasteDetector.txt').toURI().toString()) {
fileset(dir: 'src'){
include(name: '**.java')
}
}
}
Unfortunately calling gradle check yields an net.sourceforge.pmd.cpd.ReportException, the stacktrace is here.
How can I scan my source code with the Copy/Paste Detector using Gradle 1.9?
Thanks!

Answer 1

You can also use my gradle-cpd-plugin. See https://github.com/aaschmid/gradle-cpd-plugin for further informationen. Applying the cpd plugin automatically adds it the cpd as dependency of check task.
Note: I am not very happy with the name cpd for extension (see toolVersion) and task, suggestions welcome ;-)
Currently, it is version 0.1 but I am on it to switch from using CPD's ant task internally to directly call it. This will include support of all parameters etc. Here is a usage example:
apply plugin: 'cpd'
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath 'de.aaschmid.gradle.plugins:gradle-cpd-plugin:0.1'
}
}
// optional - default is 5.1.0
cpd {
toolVersion = '5.0.5'
}
tasks.cpd {
reports {
text.enabled = true
xml.enabled = false
}
source = files('src/main/java')
}

Answer 2

Guys from gradle forums suggest that you use CPD in gradle like that:
task cpd(dependsOn: ':pmdSetup') {
// Combine all source sets
allSource = files {
allprojects.findAll { proj ->
proj.hasProperty("sourceSets")
}.collect { proj ->
proj.sourceSets.collect { ss ->
ss.java
}
}
}
// Declare this task's inputs and outputs.
inputs.files allSource
outDir = file("$buildDirName/cpd")
outputs.dir outDir
// outputs.files file("$outDir.path/cpd.xml")
doLast {
outDir.mkdirs()
// Keep a reference to the gradle project for use inside the
// ant closure, where "project" refers to the ant project.
gproj = project
ant {
cpd(minimumTokenCount: '100', format: 'xml',
outputFile: outDir.path + '/cpd.xml') {
fileset(dir: projectDir.getPath()) {
// Convert the gradle sourceSet to an ant
// fileset.
allSource.each { file ->
include(name: gproj.relativePath(file))
}
}
}
}
}
}
and, of course, apply plugin: 'pmd' before.

Answer 3

The definition of my outputFile caused the problem.
I adapted this build.gradle and I'm now happy with the following solution:
check << {
File outDir = new File('build/reports/pmd/')
// Make sure the output dir exists to prevent a ReportException
outDir.mkdirs()
ant.taskdef(name: 'cpd', classname: 'net.sourceforge.pmd.cpd.CPDTask',
classpath: configurations.pmd.asPath)
ant.cpd(minimumTokenCount: '100', format: 'text',
outputFile: new File(outDir , 'cpd.txt')) {
fileset(dir: "src/main/java") {
include(name: '**/*.java')
}
}
}
Thanks Andrey Regentov and Perryn Fowler for their input.