How to use SunMSCAPI in the plugin ?

Hello guys, I'm going to use the sun.security.mscapi.SunMSCAPI to get the Windwos' CA-Certs to verify the https connection. Because the jdk9 had move the SunMSCAPI  to the jdk.crypto.mscapi module, I add the compile arg like :

compileJava {
options.compilerArgs << "--add-modules=jdk.crypto.mscapi" << "--add-exports=jdk.crypto.mscapi/sun.security.mscapi=ALL-UNNAMED"
}

which works fine when compileJava. But in the runtime it come up with an ClassNotFoundException like :  

Caused by: java.lang.ClassNotFoundException: sun.security.mscapi.SunMSCAPI PluginClassLoader[PluginDescriptor....

Here is my code:

private void test() {
    try {
        SunMSCAPI sunMSCAPI = new SunMSCAPI();
        Security.addProvider(sunMSCAPI);
        KeyStore keyStore = KeyStore.getInstance("Windows-MY");
        keyStore.load(null, null);
        Enumeration<String> aliases = keyStore.aliases();
        while (aliases.hasMoreElements()) {
            String element = aliases.nextElement();
            Certificate[] chain = keyStore.getCertificateChain(element);
        }
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

Any idea how I can do this? or maybe I should just give up to verify the peer Cert?

BTW， the peer Cert is signed by our company's CA-Cert, which is not in the jdk's keyStore