public void startApplication() {
        System.out.println("serving docs at http://localhost:" + getPort().get());
        DeploymentRegistry registry = getDeploymentRegistry();
        JavaApplicationHandle handle = registry.get(getPath(), JavaApplicationHandle.class);
        if (handle == null) {
            JavaExecHandleBuilder builder = getExecActionFactory().newJavaExec();

Class <org.gradle.internal.deployment.JavaApplicationHandle> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (JavaApplicationHandle.java:0)
Class <org.gradle.internal.deployment.RunApplication> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (RunApplication.java:0)