**I have this code to generate a CER file using the alias:**

```
public class TestFromAliasToCER {

    public static final int KEY_SIZE = 1024;
    public static final String BEGIN_CERT = "-----BEGIN CERTIFICATE-----";
    public static final String END_CERT = "-----END CERTIFICATE-----";
    public final static String LINE_SEPARATOR = System.getProperty("line.separator");

    public static void main(String[] args) throws FileNotFoundException, IOException, NoSuchAlgorithmException, NoSuchProviderException, KeyStoreException, CertificateException {

           KeyStore keyStore = KeyStore.getInstance ("Windows-MY");
           keyStore.load (null, null);         
           Enumeration<String> aux = keyStore.aliases();
           String alias = aux.nextElement();
           X509Certificate  certificate = (X509Certificate) keyStore.getCertificate (alias);
           String certString = formatCrtFileContents(certificate);         
           PrintWriter out = new PrintWriter("cert.CER");
           out.println(certString);
           out.close();

    }

    public static String formatCrtFileContents(final Certificate certificate) throws CertificateEncodingException { 

        final Base64.Encoder encoder = Base64.getMimeEncoder(64, LINE_SEPARATOR.getBytes());
        final byte[] rawCrtText = certificate.getEncoded();
        final String encodedCertText = new String(encoder.encode(rawCrtText));
        final String prettified_cert = BEGIN_CERT + LINE_SEPARATOR + encodedCertText + LINE_SEPARATOR + END_CERT;
        return prettified_cert;
    }
}

```

**This creates the cer file with**

```
-----BEGIN CERTIFICATE-----
data
-----END CERTIFICATE-----

```

I want to be able to create a PEM Certificate with the private key included, is it possible? If not, why?

I'm not restricted to Java only and free to use any Java API, but preferable with the least user interaction as possible.