keytool -import -trustcacerts -cacerts -storepass changeit -noprompt -alias test_root -file certnew.cer

import ru.CryptoPro.Crypto.CryptoProvider;
import ru.CryptoPro.JCSP.JCSP;
import ru.CryptoPro.reprov.RevCheck;

import java.security.KeyStore;
import java.security.Security;
import java.security.cert.Certificate;

public class CertChain {
    public static void main(String[] args) {
        Security.addProvider(new JCSP());
        Security.addProvider(new CryptoProvider());
        Security.addProvider(new RevCheck());

        try {
            KeyStore keyStore = KeyStore.getInstance(JCSP.REG_STORE_NAME, JCSP.PROVIDER_NAME);
            keyStore.load(null, null);

            Certificate[] chain = keyStore.getCertificateChain("f0551342e-ef2b-b116-eef9-4595c159154");
            System.out.println("Loaded certificate chain size: " + chain.length);
        } catch (Exception ex) {
            throw new RuntimeException(ex);
        }
    }
}