Java Security

Hello, everyone,
I am a little bit confused about the JCE: Does the JCE include the RSA algorithm?
I think JCE should have include the RSA algorithm because it is mentioned in the "Java Cryptography Extension (JCE) Reference Guide". But after I wrote a simple code just try to test the RSA algorithm, and after execution, it says:

Exception in thread "main" java.security.NoSuchAlgorithmException: Cannot find a
ny provider supporting RSA
at javax.crypto.Cipher.getInstance(DashoA6275)
at enc.main(enc.java:22)

The code is as following:

import java.io.*;
import java.security.*;
import javax.crypto.*;

class enc {

    public static void main (String[] args) throws NoSuchAlgorithmException, 

InvalidKeyException, IllegalBlockSizeException, NoSuchProviderException, 

BadPaddingException, NoSuchPaddingException {

/* Generate a RSA key pair */

        KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
        SecureRandom random = SecureRandom.getInstance("SHA1PRNG", "SUN");

        keyGen.initialize(1024, random);

        KeyPair pair = keyGen.generateKeyPair();
        PrivateKey priv = pair.getPrivate();
        PublicKey pub = pair.getPublic();

/* Create the cipher */      
        Cipher rsaCipher = Cipher.getInstance("RSA");

// Initialize the cipher for encryption
        rsaCipher.init(Cipher.ENCRYPT_MODE, pub);

// Cleartext
        byte[] cleartext = "This is just an example".getBytes();
        System.out.println("the original cleartext is: " + cleartext.toString());

// Encrypt the cleartext
        byte[] ciphertext = rsaCipher.doFinal(cleartext);

// Initialize the same cipher for decryption
        rsaCipher.init(Cipher.DECRYPT_MODE, priv);

// Decrypt the ciphertext
        byte[] cleartext1 = rsaCipher.doFinal(ciphertext);
        System.out.println("the final cleartext is: " + cleartext1.toString());
    }
}

Does anyone know what's wrong with my code, or what should I do?
I appreciate any help, thanks.