needs bouncycastle library:

		<dependency>
			<groupId>org.bouncycastle</groupId>
			<artifactId>bcprov-jdk15on</artifactId>
			<version>1.51</version>
		</dependency>

java codes:

import org.bouncycastle.crypto.engines.CAST5Engine; =
import org.bouncycastle.crypto.modes.CFBBlockCipher;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.crypto.params.ParametersWithIV;
import org.bouncycastle.util.Strings;
import org.bouncycastle.util.encoders.Hex;


 public void testCipher() throws UnsupportedEncodingException {
	String plain = "I am a plain String, yohoo!";
	int blockSize = 8;
	byte[] oBytes = plain.getBytes();
	byte[] enBytes =  new byte[oBytes.length];
	log.debug("plain :"+plain);
	String key = "Iamakey";

	//encryption
	boolean doEn = true;
	CAST5Engine cast5 = new CAST5Engine();
	Random r = new Random(new Date().getTime());
	byte[] iv = new byte[8];
	r.nextBytes(iv);
	ParametersWithIV ivPara = new ParametersWithIV(new KeyParameter(Strings.toByteArray(key)), iv);
	CFBBlockCipher cfbCipher = new CFBBlockCipher(cast5, blockSize);
	cfbCipher.init(doEn, ivPara);
	for(int i=0;i<oBytes.length;i++)
		cfbCipher.processBlock(oBytes, i, enBytes, i);
	enBytes = Bytes.concat(iv, enBytes);
	String enStr = Hex.toHexString(enBytes);
	log.debug("Encrypted :"+ enStr);

	//decryption from String
	doEn = false;
	enBytes = Hex.decode(enStr);
	iv = Arrays.copyOfRange(enBytes, 0, 8);
	byte[] msgArray = Arrays.copyOfRange(enBytes, 8, enBytes.length);
	cfbCipher = new CFBBlockCipher(cast5, 8);
	cfbCipher.init(doEn, new ParametersWithIV(new KeyParameter(key.getBytes()),iv ));

	byte[] deBytes =  new byte[msgArray.length];
	for(int i=0;i<msgArray.length;i++)
		cfbCipher.processBlock(msgArray, i, deBytes, i);
	log.debug("Decrypted :" + Strings.fromByteArray(deBytes));
	assertEquals(plain, Strings.fromByteArray(deBytes));
}