TransactionId empty if SignedTransaction initialized by constructor @JsonCreator

[Reguzzoni]

Problem

The SignedTransaction created by deserialization JSON (@JSONCreator) doesn't fill the attribute transactionId.
https://github.com/algorand/java-algorand-sdk/blob/develop/src/main/java/com/algorand/algosdk/transaction/SignedTransaction.java#L80

So with Atomic Composer if I put a TxnSigner as a external request that works with deserialization of SignedTransaction, It will not work cause the transactionId is emtpy.
https://github.com/algorand/java-algorand-sdk/blob/develop/src/main/java/com/algorand/algosdk/transaction/AtomicTransactionComposer.java#L188

Solution

We could add the transactionId into the constructor through@JSONCreator or other options proposed by barnji:
instead of using the txid directly from signed transaction object, use signedtransaction.tx.getTxId() or w/e its called in the atc.
it'd be redundant hashing possibly but safer in the case of a enc/dec stxn

Dependencies

No dependencies

Urgency

Low Urgency, easy to implement a workaround

[winder]

I'm not very familiar with the ATC, but from what you described I think another solution would be to call the get transaction ID function instead of assuming the field is filled in.

A small example program would help me understand the exact problem.

[winder]

This is probably because the txid is not part of the canonical representation. We exclude it during serialization and need to recompute it during deserialization.