Schnorrkel.KeyPair was created by mistake using java. The similar code is as follows. Finally, the address is generated, but in the end I lost my key. Is there any way to help retrieve it?

[lcers]

String prvKey = "*****";
ECKey ecKey = ECKey.fromPrivate( Hex.decodeHex(prvKey) );
Schnorrkel.KeyPair rootKey = new Schnorrkel.KeyPair( Hex.decodeHex( ecKey.getPublicKeyAsHex().substring(2 )), ecKey.getPrivKeyBytes() );

Address address = new Address(SS58Type.Network.LIVE, rootKey.getPublicKey())

Where ECKey comes from bitcoinj's lib

[tiantianlikeu]

hello , How to set the derivation path？
in the code
Schnorrkel.KeyPair key = instance.deriveKeyPair(rootKey, Schnorrkel.ChainCode.from(chainCode));