Transactions

final var tx = TxBuilder.createBuilder()
    .feePayer(signer.publicKey())
    .addInstruction(instruction)
    .priorityFeeLamports(priorityFeeLamports)
    .createTransaction();

final var simulation = rpcClient.simulateTransaction(Commitment.CONFIRMED, tx, true).join();
if (simulation.error() != null) {
  throw new IllegalStateException("Simulation failed: " + simulation.error());
}

// If dealing with transactions that have dynamic onchain paths or accounts, 
// increase the returned simulation values.
tx.setComputeUnitLimit(simulation.unitsConsumed().getAsInt());
tx.setAccountDataSizeLimit(simulation.loadedAccountsDataSize());
tx.setRecentBlockHash(simulation.replacementBlockHash().blockhash());

tx.sign(signer);
final var signature = rpcClient.sendTransaction(Commitment.CONFIRMED, tx.base64EncodeToString()).join();

final var builder = TxBuilder.createBuilder()
    .computeUnitLimit(200_000)
    .priorityFeeLamportsFromComputeUnitPrice(5_000);
// Priority fee: 1,000 lamports.

final var skeleton = TransactionSkeleton.deserializeSkeleton(serializedTransaction);
final var accounts = skeleton.parseAccounts();
final var instructions = skeleton.parseInstructions(accounts);