Very weird Java error

import java.security.KeyPair;
import java.security.KeyPairGenerator;

import javax.crypto.Cipher;

//
// Public Key cryptography using the RSA algorithm.
public class RSATest {

	public static void main (String[] args) throws Exception {

		//
	// check args and get plaintext
	if (args.length !=1) {
		System.err.println("Usage: java PublicExample text");
		System.exit(1);
	}
	byte[] plainText = args[0].getBytes("UTF8");

	//
	// generate an RSA key
	System.out.println( "\nStart generating RSA key" );
	KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
	keyGen.initialize(1024);
	KeyPair key = keyGen.generateKeyPair();
	System.out.println( "Finish generating RSA key" );

	//
	// get an RSA cipher object and print the provider
	Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
	System.out.println( "\n" + cipher.getProvider().getInfo() );

	//
	// encrypt the plaintext using the public key
	System.out.println( "\nStart encryption" );
	cipher.init(Cipher.ENCRYPT_MODE, key.getPublic());
	byte[] cipherText = cipher.doFinal(plainText);
	System.out.println( "Finish encryption: " );

	System.out.println( ByteArrayUtils.writeByteArray(cipherText) );
	//
	// decrypt the ciphertext using the private key
	System.out.println( "\nStart decryption" );
	cipher.init(Cipher.DECRYPT_MODE, key.getPrivate());
	byte[] newPlainText = cipher.doFinal(cipherText);
	System.out.println( "Finish decryption: " );
	System.out.println( new String(newPlainText, "UTF8") );
	}
}

import java.io.IOException;
import java.io.PrintWriter;
import java.security.KeyPair;
import java.security.KeyPairGenerator;

import javax.crypto.Cipher;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


public class RSATestServlet extends HttpServlet {

    public void init(ServletConfig config) throws ServletException {
        super.init(config);

    }

    public void destroy() {

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();

        out.println("<html>");
        out.println("<head>");
        out.println("<title>RSA Test Servlet</title>");
        out.println("</head>");
        out.println("<body>");

		try {
/*			// add security provider
			java.security.Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
*/
			byte[] plainText = "cleartext".getBytes("UTF8");

			//
			// generate an RSA key
			out.println( "\nStart generating RSA key" + "
");
			KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
			keyGen.initialize(1024);
			KeyPair key = keyGen.generateKeyPair();
			out.println( "Finish generating RSA key" + "
");

			//
			// get an RSA cipher object and print the provider
			Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
			out.println( "\n" + cipher.getProvider().getInfo() + "
" );

			//
			// encrypt the plaintext using the public key
			out.println( "\nStart encryption" + "
" );
			cipher.init(Cipher.ENCRYPT_MODE, key.getPublic());
			byte[] cipherText = cipher.doFinal(plainText);
			out.println( "Finish encryption: " );

			out.println( ByteArrayUtils.writeByteArray(cipherText) + "
");
			//
			// decrypt the ciphertext using the private key
			out.println( "\nStart decryption" + "
" );
			cipher.init(Cipher.DECRYPT_MODE, key.getPrivate());
			byte[] newPlainText = cipher.doFinal(cipherText);
			out.println( "Finish decryption: " );
			out.println( new String(newPlainText, "UTF8") + "
" );


		} catch(Throwable t) {
			out.println(t);
		}

        out.println("</body>");
        out.println("</html>");

        out.close();
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {

		doGet(request, response);

    }

}

java.security.NoSuchAlgorithmException: Cannot find any provider supporting RSA/ECB/PKCS1Padding

java.lang.NoClassDefFoundError: com/sun/crypto/provider/SunJCE
	java.lang.Class.getDeclaredConstructors0(Native Method)
	java.lang.Class.privateGetDeclaredConstructors(Class.java:2357)
	java.lang.Class.getConstructor0(Class.java:2671)
	java.lang.Class.newInstance0(Class.java:321)
	java.lang.Class.newInstance(Class.java:303)
	org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
	org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:535)
	org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
	org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:790)
	org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:709)
	org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:572)
	org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:644)
	java.lang.Thread.run(Thread.java:613)