Starksoft

KeyStore keyStore = KeyStore.getInstance("PKCS12");
FileInputStream clientCertificateContent = new FileInputStream("/path/to/publicAndPrivateKey.p12");
keyStore.load(clientCertificateContent, "private key password".toCharArray());

KeyManagerFactory keyManagerFactory = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
keyManagerFactory.init(keyStore, "private key password".toCharArray());

FileInputStream myTrustedCAFileContent = new FileInputStream("/path/to/embedded/CA-Chain.pem");
CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");
X509Certificate myCAPublicKey = (X509Certificate) certificateFactory.generateCertificate(myTrustedCAFileContent);