Finding duplicated classes on classpath

build.gradle

task checkClassPath {
    ext {
        inConfig = getConfigurations().findByName("runtimeClasspath")
    }
    inputs.files(inConfig)
    doLast {
        Configuration myConfig = inConfig;
        Collection<Tuple<Object>> fileTrees = myConfig.resolve().stream().map(jar -> Tuple.of(jar, zipTree(jar))).collect()
        HashMap<String, Set<String>> classToJars = new HashMap<>()
        fileTrees.forEach(
                (File file, FileTree tree) -> {
                    Set<File> classes = tree.getFiles()
                    classes.forEach((File classFile) -> {
                        java.nio.file.Path currentPath = classFile.toPath()
                        java.nio.file.Path parent = currentPath.getParent()
                        while (parent != null && !parent.toFile().getName().equals("expandedArchives")) {
                            currentPath = parent
                            parent = currentPath.getParent()
                        }
                        String jarName = currentPath.toFile().getName().split("_")[0]
                        java.nio.file.Path classRelativePath = currentPath.relativize(classFile.toPath())
                        classToJars.get(classRelativePath.toString(), new HashSet()).add(jarName)
                    })
                }
        )
        for (String className : classToJars.keySet()) {
            Set<String> jars = classToJars.get(className)
            if (jars.size() > 1) {
                print("${className} duplicated in ${jars}\n")
            }
        }
    }
}