How to use

toByteArray

method

in

ethereumj.crypto.ECKey$ECDSASignature

private byte[] createClosingMsgHash(Address senderAddress, BigInteger openBlockNumber,
  BigInteger owedBalance, ECKey receiverECKey, Address channelManagerAddr) {
 byte[] closingMsgHash =
   createClosingMsgHashRaw(senderAddress, openBlockNumber, owedBalance, channelManagerAddr);
 return receiverECKey.sign(closingMsgHash)
   .toByteArray();
}

private byte[] createBalanceMsgHash(Address receiverAddress, BigInteger openBlockNumber,
  BigInteger owedBalance, ECKey senderECKey, Address channelManagerAddr) {
 byte[] balanceMsgHash =
   createBalanceMsgHashRaw(receiverAddress, openBlockNumber, owedBalance, channelManagerAddr);
 return senderECKey.sign(balanceMsgHash)
   .toByteArray();
}

public String toHex() {
 return normalize(Hex.toHexString(toByteArray()));
}