Gradle DefaultIsolatedAntBuilder PermGen Leak

build.gradle

// Enable the Gradle daemon and run this until failure:
// while gradle --rerun-tasks; do :; done

import org.gradle.api.internal.ClassPathRegistry
import org.gradle.api.internal.DefaultClassPathProvider
import org.gradle.api.internal.DefaultClassPathRegistry
import org.gradle.api.internal.classpath.DefaultModuleRegistry
import org.gradle.api.internal.classpath.ModuleRegistry
import org.gradle.api.internal.project.antbuilder.DefaultIsolatedAntBuilder
import org.gradle.internal.classloader.DefaultClassLoaderFactory

ModuleRegistry moduleRegistry = new DefaultModuleRegistry()
ClassPathRegistry registry = new DefaultClassPathRegistry(new DefaultClassPathProvider(moduleRegistry))
DefaultIsolatedAntBuilder antBuilder = new DefaultIsolatedAntBuilder(registry, new DefaultClassLoaderFactory())

defaultTasks 'test'

antBuilder.execute {
    // Can be any JAR file
    antProject.getClass().classLoader.addURL(new File('/opt/dita-ot/lib/xml-resolver-1.2.jar').toURL())
}

task test {
    antBuilder.execute {
        echo('hello world')
    }
}