classesDir.createDir()

        def fileManager = compiler.getStandardFileManager(null, null, null)
        def task = compiler.getTask(null, fileManager, null, ["-d", classesDir.path], null, fileManager.getJavaFileObjects(srcFile))
        task.call()
        def cl = VisitableURLClassLoader.fromClassPath("groovy-loader", groovyClassLoader, DefaultClassPath.of(classesDir))
        cl.loadClass(className)
    }